Active Stability Control System (asc) - Except Lancer Evolution — Mitsubishi Lancer Evolution X (2007-2016)

SERVICE SPECIFICATIONS

Item	Standard value
Wheel speed sensor current mA	5.9 - 8.4 or 11.8 - 16.8
Wheel speed sensor insulation resistance Mohms	5 or more

ITEM SPECIFICATIONS

INTRODUCTION TO ASC DIAGNOSIS

The ASC operates differently from conventional brake systems. These differences include sounds, sensations, and vehicle performance that owners and service technicians who are not familiar with ASC may not be used to.

Some operational characteristics may seem to be malfunctions, but they are simply signs of normal ASC operation. When diagnosing the ASC system, keep these operational characteristics in mind. Inform the owner of the kind of performance characteristics to expect from an ASC-equipped vehicle.

ASC DIAGNOSTIC TROUBLE CODE DETECTION CONDITIONS

ASC diagnostic trouble codes (DTCs) are set under different conditions, depending on the malfunction detected. Most ASC DTCs will only be set during vehicle operation.

Some ASC DTCs will also be set during the ASC self-check immediately after the engine is started.

When you check if an ASC DTC will be displayed again after the DTC has been erased, you should duplicate the ASC DTC set conditions. Depending on the detection timing and set conditions for the specific ASC DTC, you must either drive the vehicle or turn the engine off and restart it. To set the proper conditions for that DTC again, refer to for each ASC DTC that you are trying to reset.

ASC DIAGNOSTIC TROUBLESHOOTING STRATEGY

Use these steps to plan your diagnostic strategy. If you follow them carefully, you will be sure that you have exhausted most of the possible ways to find an ASC fault.

Gather information about the problem from the customer.
Verify that the condition described by the customer exists.
Check the vehicle for any ASC DTC.
If you cannot verify the condition and there are no ASC DTCs, the malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
If you can verify the condition but there are no ASC DTCs, or the system cannot communicate with the scan tool, check that the basic brake system is operating properly. If the basic brake system is not operating properly, refer to the «BASIC BRAKE SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__basic-brake-system-diagnostic-troubleshooting-strategy) . If the basic brake system is operating properly, refer to «SYMPTOM CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__symptom-chart) .
If there is an ASC DTC, record the number of the DTC, then erase the DTC from the memory using the scan tool.
Recreate the ASC DTC set conditions to see if the same ASC DTC will set again. If the same ASC DTC sets again, perform the diagnostic procedures for the DTC. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) . If you cannot get the same ASC DTC to set again, the malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

ABS WARNING LIGHT, ASC WARNING/OPERATION LIGHT AND BRAKE WARNING LIGHT CHECK

Check that ABS and brake warning light, ASC warning/operation light illuminate as follows.

Note. The brake warning light is used as a warning light for parking brake, brake fluid level, and EBD control.

Scheme 1

Scheme 1: ABS WARNING LIGHT, ASC WARNING/OPERATION LIGHT AND BRAKE WARNING LIGHT CHECK

When the ignition switch is turned to the ON position, ABS and brake warning light, ASC warning/operation light illuminate.
The ABS and brake warning light, ASC warning/operation light illuminate for three seconds *1 and then turn OFF *2 .
Otherwise, check the diagnostic trouble code. NOTE: *1 : The ABS warning light may stay ON until the vehicle speed reaches 10 km/h. As far as ABS-ECU stores any diagnostic trouble code related to the wheel speed sensor malfunction or the motor malfunction as past trouble, ABS-ECU continues illuminating the ABS warning light until it verifies that the malfunction for that code is resolved (startup check). *2 : The brake warning light does not turn OFF when the parking brake is applied or the brake fluid level is lowered.

ON-BOARD DIAGNOSTICS

If the ASC-ECU detects any problem in the CAN communication line or the ECUs, which the ASC-ECU is communicating with, it stores a diagnostic trouble code. The DTCs can be confirmed by connecting scan tool MB991958 (M.U.T.-III sub assembly.) The stored DTCs are not erased even after the ignition switch has been turned to the LOCK (OFF) position, or the battery has been disconnected. The DTCs can be erased by operating scan tool MB991958 (M.U.T.-III sub assembly.)

HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

CAUTION

To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Scheme 2

Ensure that the ignition switch is at the "LOCK" (OFF) position.
Start up the personal computer.
Connect special tool MB991827 to special tool MB991824 and the personal computer.
Connect special tool MB991910 to the special tool MB991824.
Connect special tool MB991910 to the data link connector.
Turn the power switch special tool MB991824 to the "ON" position. NOTE: When the special tool MB991824 is energized, the special tool MB991824 indicator light will be illuminated in a green color.
Start the M.U.T.-III system on the personal computer. NOTE: Disconnect the scan tool MB991958 in the reverse order of the connecting sequence, making sure that the ignition switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

CAUTION

To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Note. If the battery voltage is low, diagnostic trouble codes will not be set. Check the battery if scan tool MB991958 does not display.

Connect scan tool MB991958 to the data link connector.
Turn the ignition switch to the "ON" position.
Select "System Select."
Select "ABS/ASC/ASTC" from the system list, and select the "OK" button.
Select "Diagnostic Trouble Code." to read the DTC.
If a DTC is set, it is shown.
Choose "DTC erase" to erase the DTC.

HOW TO READ DATA LIST

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

CAUTION

To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958 to the data link connector.
Turn the ignition switch to the "ON" position.
Select "System Select."
Select "ABS/ASC/ASTC" from the system list, and select the "OK" button.
Select "Data List."

HOW TO PERFORM ACTUATOR TEST

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

CAUTION

To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958 to the data link connector.
Turn the ignition switch to the "ON" position.
Select "System Select."
Select "ABS/ASC/ASTC" from the system list, and select the "OK" button.
Choose "Actuator Test" from "ABS" screen.
Choose an appropriate item and select the "OK" button.

HOW TO DIAGNOSE THE CAN BUS LINE

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

CAUTION

To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958 to the data link connector.
Turn the ignition switch to the "ON" position.
Select "CAN bus diagnosis" from the start-up screen.
When the vehicle information is displayed, confirm that it matches the vehicle whose CAN bus lines will be diagnosed. If they match, go to step 8 . If not, go to step 5.
Select "view vehicle information" button.
When the vehicle information is displayed, confirm again that it matches the vehicle which is being diagnosed. If they match, go to step 8 . If not, go to step 5 .
Press the "OK" button.
When the options are displayed, choose the options (mark the check) and then select "OK".

DIAGNOSTIC FUNCTION

ASC-ECU has the following functions for easier system checks.

DTC set (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ).
Service data output (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ).
Actuator test (Refer to «ACTUATOR TEST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__actuator-test-reference-table) ).
Freeze frame data output (Refer to «CHECK OF FREEZE FRAME DATA»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__check-of-freeze-frame-data) ).

All the above items can be diagnosed using scan tool.

CHECK OF FREEZE FRAME DATA

The freeze frame data can be checked by using the scan tool.

When detecting fault and storing the DTC, the ECU connected to CAN bus line obtains the data before the determination of the DTC and the data when the DTC is determined, and then stores the ECU status of that time. By analyzing each data from scan tool, the troubleshooting can be performed more efficiently. The displayed items are as the table below.

Display item list

Item No.	Item name	Content	Unit
1	Odometer	Total driving distance after the DTC is generated	Mile
2	Ignition cycle	Number of times the ignition switch is turned "ON" or "LOCK (OFF)" after the past failure transition	Number of counts is displayed.
4	Accumulated minute	Cumulative time for current malfunction of DTC	Min
5	Power supply voltage	Voltage of power supply when the DTC is generated	V
8	Lateral G sensor	Lateral G of G and yaw rate sensor when the DTC is generated	G
9	G sensor	Longitudinal G of G and yaw rate sensor when the DTC is generated	G
10	Master cylinder pressure	Master cylinder pressure of Master cylinder pressure sensor when the DTC is generated	Bar
11	Steering angle	Steering angle of steering wheel sensor when the DTC is generated	Deg
12	Yaw rate sensor	Yaw rate of G and yaw rate sensor when the DTC is generated	Deg/s
13	Stop light switch	Stop light switch condition when the DTC is generated :OFF/ON
21	Pump motor	Pump motor condition when the DTC is generated :OFF/ON
28	ASC/TCL off switch	ASC OFF switch condition when the DTC is generated :OFF/ON
301	ABS control	ABS control when the DTC is generated :OFF/ON
302	Brake TCL control	Traction control (brake control) when the DTC is generated :OFF/ON
303	Engine TCL control	Traction control (engine control) when the DTC is generated :OFF/ON
304	ASC control	ASC control when the DTC is generated :OFF/ON
305	Brake TCL operation	Traction control (brake control) operation when the DTC is generated: Permission/Prohibition
401	FL wheel speed sensor	Wheel speed (FL) when the DTC is generated	Mph
402	FR wheel speed sensor	Wheel speed (FR) when the DTC is generated	Mph
403	RL wheel speed sensor	Wheel speed (RL) when the DTC is generated	Mph
404	RR wheel speed sensor	Wheel speed (RR) when the DTC is generated	Mph

DISPLAY ITEM LIST

FAIL-SAFE FUNCTIONS

ASC-ECU constantly monitors the input and output signals. If an error is detected in the system, ASC-ECU sends a fail signal and the corresponding indicator light is illuminated or blinks. Various controls are processed depending on the cause of malfunction as shown in chart below.

Illumination condition of warning light and display in case of failure

DTC	Item		Brake warning light, brake warning display	ABS warning light, ABS warning display	ASC warning light, ASC warning display	ASC OFF warning light, ASC OFF warning display
C100A	Abnormality in FL wheel speed sensor circuit		OFF (1)	ON (2)	ON	ON
C1015	Abnormality in FR wheel speed sensor circuit
C1020	Abnormality in RL wheel speed sensor circuit
C102B	Abnormality in RR wheel speed sensor circuit
C1011	Abnormality in FL wheel speed sensor signal		OFF (1)	ON (2)	ON	ON
C101C	Abnormality in FR wheel speed sensor signal
C1027	Abnormality in RL wheel speed sensor signal
C1032	Abnormality in RR wheel speed sensor signal
C1014	Mutual monitoring of FL wheel speed sensor		OFF (1)	ON (2)	ON	ON
C101F	Mutual monitoring of FR wheel speed sensor
C102A	Mutual monitoring of RL wheel speed sensor
C1035	Mutual monitoring of RR wheel speed sensor
C1041	Abnormality in periodical signal for FL wheel speed sensor		OFF (1)	ON (2)	ON	ON
C1042	Abnormality in periodical signal for FR wheel speed sensor
C1043	Abnormality in periodical signal for RL wheel speed sensor
C1044	Abnormality in periodical signal for RR wheel speed sensor
C1046	FL wheel speed sensor control phase time exceeded		OFF (1)	ON (2)	ON	ON
C1047	FR wheel speed sensor control phase time exceeded
C1048	RL wheel speed sensor control phase time exceeded
C1049	RR wheel speed sensor control phase time exceeded
C104B	Abnormality in FL wheel inlet valve system		ON	ON	ON	ON
C104F	Abnormality in FR wheel inlet valve system
C1053	Abnormality in RL wheel inlet valve system
C1057	Abnormality in RR wheel inlet valve system
C105F	Abnormality in FL wheel outlet valve system		ON	ON	ON	ON
C1063	Abnormality in FR wheel outlet valve system
C1067	Abnormality in RL wheel outlet valve system
C105B	Abnormality in RR wheel outlet valve system
C1200	Abnormality in FL/RR wheel cut valve system		ON	ON	ON	ON
C1204	Abnormality in FR/RL wheel cut valve system
C1208	Abnormality in FL/RR wheel suction valve system
C120C	Abnormality in FR/RL wheel suction valve system
C2104	Faulty valve power supply circuit		ON	ON	ON	ON
C1073	Faulty motor drive circuit		OFF	ON (2)	ON	ON
C2116	Low or high power supply voltage in pump motor		OFF	ON (2)	ON	ON
C121D	Abnormality in brake fluid pressure sensor circuit		OFF	ON	ON	ON
C121E	Abnormality in brake fluid pressure sensor output signal		OFF	ON	ON	ON
C1000	Abnormality in stop light switch circuit		OFF	OFF	ON	ON
C123B	Prolonged operation of ASC		OFF	OFF	ON	ON
C2200	Abnormality in ASC-ECU		ON (4)	ON (5)	ON	ON
C2101	Abnormality in battery voltage (high voltage)	18.0 ± 1.0 V or more	ON	ON	ON	ON
C1395	Brake fluid filling not completed		OFF	ABS warning light: Flashing (1 Hz) ABS warning display: ON	OFF	OFF
C121C	Torque request signal rejection		OFF	OFF	ON	ON
C1290	CAN time-out error		OFF	OFF	ON	ON
C2203	VIN not recorded		OFF	ON	OFF	OFF
C1210 (7)	Abnormality in G & yaw rate sensor	Abnormality in longitudinal G-sensor output voltage	OFF	ON	ON	ON
C1242 (7)	Abnormality in G & yaw rate sensor	Abnormality in longitudinal G-sensor output signal	OFF	ON	ON	ON
C123C	Abnormality in G & yaw rate sensor		OFF	OFF	ON	ON
C2204	Internal abnormality in G & yaw rate sensor		OFF	OFF (6) ON (5) , (7)	ON	ON
C2111	Brake fluid pressure sensor power supply circuit	Low input	OFF	ON	ON	ON
C2112	Brake fluid pressure sensor power supply circuit	High input	OFF	ON	ON	ON
C2114 (3)	Abnormality in G & yaw rate sensor operation voltage	Low voltage	OFF	OFF (6) ON (7)	ON	ON
C2115	Abnormality in G & yaw rate sensor operation voltage	High voltage	OFF	OFF (6) ON (7)	ON	ON
C123A	Abnormality in sensor calibration		OFF	OFF (6) ON (5) , (7)	ON	ON
C1219	Abnormality in steering wheel sensor signal		OFF	OFF	ON	ON
C121A	Abnormality in steering wheel sensor calibration	Steering wheel sensor neutral point not learned	OFF	ABS warning light: Flashing (2 Hz) ABS warning display: ON	ON	ON
C2205	Internal abnormality in steering wheel sensor		OFF	OFF	ON	ON
C2002	Valve calibration error		ON	ON	ON	ON
C2003	Control parameter not implement		OFF	OFF	OFF	ON
C1608	Implausible diagnosis data		OFF	OFF	OFF	OFF
U0001	Bus-off		OFF	OFF	OFF	OFF
U0100	Engine time-out error		OFF	OFF	OFF	OFF
U0101	CVT time-out error (8)		OFF	OFF	OFF	OFF
U0101	TC-SST time-out error (7)		OFF	OFF	OFF	OFF
U0126	Steering wheel sensor time-out error		OFF	OFF	OFF	OFF
U0141	ETACS time-out error		OFF	OFF	OFF	OFF
U0114 (7)	AWC time-out error		OFF	OFF	OFF	OFF
U0125	G & yaw rate sensor message time-out error/message error		OFF	OFF (6) ON (7)	ON	ON
U1003	G & yaw rate sensor bus-off		OFF	OFF (6) ON (7)	ON	ON
U0401	Engine signal malfunction detected		OFF	OFF	ON	ON
U0428	Steering wheel sensor CRC, message error		OFF	OFF	ON	ON
U1415	Variant coding not implemented		OFF	ON	ON	ON
U1417	Variant coding value invalid (includes faulty installation)		OFF	ON (5)	ON	ON
(1) Turns on when two or more wheels are faulty. (2) Stays on until the vehicle speed reaches 6 mph (10 km/h) when the ignition switch is turned to ON next time. (3) This DTC is not set with the vehicle speed of 12 mph (20 km/h) or less. (4) Does not illuminate when there is no effect to the EBD function. (5) Does not illuminate when there is no effect to the ABS function. (6) FWD (7) AWD (8) CVT

(1)	Turns on when two or more wheels are faulty.

(2)	Stays on until the vehicle speed reaches 6 mph (10 km/h) when the ignition switch is turned to ON next time.

(3)	This DTC is not set with the vehicle speed of 12 mph (20 km/h) or less.

(4)	Does not illuminate when there is no effect to the EBD function.

(5)	Does not illuminate when there is no effect to the ABS function.

(6)

FWD

(7)

AWD

(8)

CVT

DTC REFERENCE CHART

Under EBD, ABS, skid control, TCL control and HSA function in case of failure

DTC	Item		EBD	ABS	Skid control	TCL	HSA
C100A	Abnormality in FL wheel speed sensor circuit		Enabled (1)	Prohibited	Prohibited	Prohibited	Prohibited
C1015	Abnormality in FR wheel speed sensor circuit
C1020	Abnormality in RL wheel speed sensor circuit
C102B	Abnormality in RR wheel speed sensor circuit
C1011	Abnormality in FL wheel speed sensor signal		Enabled (1)	Prohibited	Prohibited	Prohibited	Prohibited
C101C	Abnormality in FR wheel speed sensor signal
C1027	Abnormality in RL wheel speed sensor signal
C1032	Abnormality in RR wheel speed sensor signal
C1014	Mutual monitoring of FL wheel speed sensor		Enabled (1)	Prohibited	Prohibited	Prohibited	Prohibited
C101F	Mutual monitoring of FR wheel speed sensor
C102A	Mutual monitoring of RL wheel speed sensor
C1035	Mutual monitoring of RR wheel speed sensor
C1041	Abnormality in periodical signal for FL wheel speed sensor		Enabled (1)	Prohibited	Prohibited	Prohibited	Prohibited
C1042	Abnormality in periodical signal for FR wheel speed sensor
C1043	Abnormality in periodical signal for RL wheel speed sensor
C1044	Abnormality in periodical signal for RR wheel speed sensor
C1046	FL wheel speed sensor control phase time exceeded		Enabled (1)	Prohibited	Prohibited	Prohibited	Prohibited
C1047	FR wheel speed sensor control phase time exceeded
C1048	RL wheel speed sensor control phase time exceeded
C1049	RR wheel speed sensor control phase time exceeded
C104B	Abnormality in FL wheel inlet valve system		Prohibited	Prohibited	Prohibited	Prohibited	Prohibited
C104F	Abnormality in FR wheel inlet valve system
C1053	Abnormality in RL wheel inlet valve system
C1057	Abnormality in RR wheel inlet valve system
C105F	Abnormality in FL wheel outlet valve system		Prohibited	Prohibited	Prohibited	Prohibited	Prohibited
C1063	Abnormality in FR wheel outlet valve system
C1067	Abnormality in RL wheel outlet valve system
C105B	Abnormality in RR wheel outlet valve system
C1200	Abnormality in FL/RR wheel cut valve system		Prohibited	Prohibited	Prohibited	Prohibited	Prohibited
C1204	Abnormality in FR/RL wheel cut valve system
C1208	Abnormality in FL/RR wheel suction valve system
C120C	Abnormality in FR/RL wheel suction valve system
C2104	Faulty valve power supply circuit		Prohibited	Prohibited	Prohibited	Prohibited	Prohibited
C1073	Faulty motor drive circuit		Enabled	Prohibited	Prohibited	Prohibited	Prohibited
C2116	Low or high power supply voltage in pump motor		Enabled	Prohibited	Prohibited	Prohibited	Prohibited
C121D	Abnormality in brake fluid pressure sensor circuit		Enabled	Prohibited	Prohibited	Prohibited	Prohibited
C121E	Abnormality in brake fluid pressure sensor output signal		Enabled	Prohibited	Prohibited	Prohibited	Prohibited
C1000	Abnormality in stop light switch circuit		Enabled	Enabled	Prohibited	Prohibited	Prohibited
C123B	Prolonged operation of ASC		Enabled	Enabled	Prohibited	Prohibited	Prohibited
C2200	Abnormality in ASC-ECU		Prohibited (3)	Prohibited (4)	Prohibited	Prohibited	Prohibited
C2101	Abnormality in battery voltage (high voltage)	18.0 ± 1.0 V or more	Prohibited	Prohibited	Prohibited	Prohibited	Prohibited
C1395	Brake fluid filling not completed		Enabled	Enabled	Enabled	Enabled	Prohibited
C121C	Torque request signal rejection		Enabled	Enabled	Prohibited	Prohibited	Prohibited
C1290	CAN time-out error		Enabled	Enabled	Prohibited	Prohibited	Prohibited
C2203	VIN not recorded		Enabled	Enabled	Enabled	Enabled	Enabled
C2206	Re-execution of variant coding		Enabled	Prohibited	Prohibited	Prohibited	Prohibited
C1210 (6)	Abnormality in G & yaw rate sensor	Abnormality in longitudinal G-sensor output value	Enabled	Prohibited	Prohibited	Prohibited	Prohibited
C1242 (6)	Abnormality in G & yaw rate sensor	Abnormality in longitudinal G-sensor output signal	Enabled	Prohibited	Prohibited	Prohibited	Prohibited
C123C	Abnormality in G & yaw rate sensor		Enabled	Enabled	Prohibited	Prohibited	Prohibited
C2204	Internal abnormality in G & yaw rate sensor		Enabled	Enabled (5) Prohibited (4) , (6)	Prohibited	Prohibited	Prohibited
C2111	Brake fluid pressure sensor power supply circuit	Low input	Enabled	Prohibited	Prohibited	Prohibited	Prohibited
C2112	Brake fluid pressure sensor power supply circuit	High input	Enabled	Prohibited	Prohibited	Prohibited	Prohibited
C2114 (2)	Abnormality in G & yaw rate sensor operation voltage	Low voltage	Enabled	Enabled (5) Prohibited (6)	Prohibited	Prohibited	Prohibited
C2115	Abnormality in G & yaw rate sensor operation voltage	High voltage	Enabled	Enabled (5) Prohibited (6)	Prohibited	Prohibited	Prohibited
C123A	Abnormality in sensor calibration		Enabled	Enabled (5) Prohibited (4) , (6)	Prohibited	Prohibited	Prohibited
C1219	Abnormality in steering wheel sensor signal		Enabled	Enabled	Prohibited	Prohibited	Prohibited
C121A	Abnormality in steering wheel sensor calibration	Steering wheel sensor neutral point not learned	Enabled	Enabled	Prohibited	Prohibited	Prohibited
C2205	Internal abnormality in steering wheel sensor		Enabled	Enabled	Prohibited	Prohibited	Prohibited
C2002	Valve calibration error		Prohibited	Prohibited	Prohibited	Prohibited	Prohibited
C2003	Control parameter not implement		Enabled	Enabled	Prohibited	Prohibited	Prohibited
C1608	Implausible diagnosis data		Enabled	Enabled	Enabled	Enabled	Enabled
U0001	Bus-off		Enabled	Enabled	Enabled	Enabled	Enabled
U0100	Engine time-out error		Enabled	Enabled	Enabled	Enabled	Enabled
U0101	CVT time-out error (5)		Enabled	Enabled	Enabled	Enabled	Enabled
U0101	TC-SST time-out error (6)		Enabled	Enabled	Enabled	Enabled	Enabled
U0126	Steering wheel sensor time-out error		Enabled	Enabled	Enabled	Enabled	Enabled
U0141	ETACS time-out error		Enabled	Enabled	Enabled	Enabled	Enabled
U0114 (6)	AWC time-out error		Enabled	Enabled	Enabled	Enabled	Enabled
U0125	G & yaw rate sensor message time-out error/message error		Enabled	Enabled (5) Prohibited (6)	Prohibited	Prohibited	Prohibited
U0401	Engine signal malfunction detected		Enabled	Enabled	Prohibited	Prohibited	Prohibited
U0428	Steering wheel sensor CRC, message error		Enabled	Enabled	Prohibited	Prohibited	Prohibited
U1003	G & yaw rate sensor bus-off		Enabled	Enabled (5) Prohibited (6)	Prohibited	Prohibited	Prohibited
U1415	Variant coding not implemented		Enabled	Prohibited	Prohibited	Prohibited	Prohibited
U1417	Variant coding value invalid (includes faulty installation)		Enabled	Prohibited (4)	Prohibited	Prohibited	Prohibited
(1) Turns on when two or more wheels are faulty. (2) This DTC is not set with the vehicle speed of 12 mph (20 km/h) or less. (3) Not prohibited when the brake warning light is not illuminated. (4) Not prohibited when the ABS warning light is not illuminated. (5) FWD (6) AWD

(1)	Turns on when two or more wheels are faulty.

(2)	This DTC is not set with the vehicle speed of 12 mph (20 km/h) or less.

(3)	Not prohibited when the brake warning light is not illuminated.

(4)	Not prohibited when the ABS warning light is not illuminated.

(5)

FWD

(6)

AWD

DTC REFERENCE CHART

DIAGNOSTIC TROUBLE CODE CHART

CAUTION

During diagnosis, a DTC associated with other system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for DTC(s). If DTC(s) are set, erase them all.

DTC	Item
C100A	Abnormality in FL wheel speed sensor circuit
C1015	Abnormality in FR wheel speed sensor circuit
C1020	Abnormality in RL wheel speed sensor circuit
C102B	Abnormality in RR wheel speed sensor circuit
C1011	Abnormality in FL wheel speed sensor signal
C101C	Abnormality in FR wheel speed sensor signal
C1027	Abnormality in RL wheel speed sensor signal
C1032	Abnormality in RR wheel speed sensor signal
C1014	Mutual monitoring of FL wheel speed sensor
C101F	Mutual monitoring of FR wheel speed sensor
C102A	Mutual monitoring of RL wheel speed sensor
C1035	Mutual monitoring of RR wheel speed sensor
C1041	Abnormality in periodical signal for FL wheel speed sensor
C1042	Abnormality in periodical signal for FR wheel speed sensor
C1043	Abnormality in periodical signal for RL wheel speed sensor
C1044	Abnormality in periodical signal for RR wheel speed sensor
C1046	FL wheel speed sensor control phase time exceeded
C1047	FR wheel speed sensor control phase time exceeded
C1048	RL wheel speed sensor control phase time exceeded
C1049	RR wheel speed sensor control phase time exceeded
C104B	Abnormality in FL wheel inlet valve system
C104F	Abnormality in FR wheel inlet valve system
C1053	Abnormality in RL wheel inlet valve system
C1057	Abnormality in RR wheel inlet valve system
C105F	Abnormality in FL wheel outlet valve system
C1063	Abnormality in FR wheel outlet valve system
C1067	Abnormality in RL wheel outlet valve system
C105B	Abnormality in RR wheel outlet valve system
C1200	Abnormality in FL/RR wheel cut valve system
C1204	Abnormality in FR/RL wheel cut valve system
C1208	Abnormality in FL/RR wheel suction valve system
C120C	Abnormality in FR/RL wheel suction valve system
C2104	Faulty valve power supply circuit
C1073	Faulty motor drive circuit
C2116	Low power supply voltage in pump motor
C121D	Abnormality in brake fluid pressure sensor circuit
C121E	Abnormality in brake fluid pressure sensor output signal
C1000	Abnormality in stop lamp switch circuit
C123B	Prolonged operation of ASC
C2200	Abnormality in ASC-ECU
C2101	Abnormality in battery voltage (high voltage)	18.0 ± 1.0 V or more
C1395	Brake fluid filling not completed
C121C	Torque request signal rejection
C1290	CAN time-out error
C2203	VIN not recorded
C2206	Re-execution of variant coding
C123C	Abnormality in G and yaw rate sensor	Abnormality in lateral G sensor and yaw rare output value (incorrect installation)
C1210 (3)	Abnormality in G and yaw rate sensor	Abnormality in longitudinal G-sensor output voltage
C1242 (3)	Abnormality in G and yaw rate sensor	Abnormality in longitudinal G-sensor output signal
C2204	Internal abnormality in G and yaw rate sensor
C2111	Brake fluid pressure sensor power supply circuit	Low input
C2112	Brake fluid pressure sensor power supply circuit	High input
C2114 (1)	Abnormality in G and yaw rate sensor operation voltage	Low voltage
C2115	Abnormality in G and yaw rate sensor operation voltage	High voltage
C123A	Abnormality in sensor calibration
C1219	Abnormality in steering wheel sensor signal
C121A	Abnormality in steering wheel sensor calibration	Steering wheel sensor neutral point not learned
C2205	Internal abnormality in steering wheel sensor
C1395	Brake fluid filling not completed
C1608	Implausible diagnosis data
C2002	Valve calibration not completed
C2003	Control parameter not implement
U0001	Bus-off
U0100	Engine time-out error
U0101	CVT time-out error (2)
U0101	TC-SST time-out error (3)
U0126	Steering wheel sensor time-out error
U0114 (3)	AWC time-out error
U0141	ETACS time-out error
U0125	G and yaw rate sensor message time-out error/message error
U0401	Engine signal malfunction detected
U0428	Communication error in steering wheel sensor
U1003	G and yaw rate sensor bus-off
U1415	Variant coding not implemented
U1417	Variant coding value invalid (includes faulty installation)
(1) This DTC is not set with the vehicle speed of 12 mph (20 km/h) or less. (2) FWD (3) AWD

(1)	This DTC is not set with the vehicle speed of 12 mph (20 km/h) or less.

(2)

FWD

(3)

AWD

DIAGNOSTIC TROUBLE CODE CHART

Scheme 3

Scheme 3: DTC C100A Abnormality in FL wheel speed sensor circuit

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

OPERATION

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

DTC SET CONDITIONS

ASC-ECU monitors the voltage fluctuation in each wheel speed sensor circuit. If ASC-ECU detects the open or short circuit in the circuit, it will set a DTC.

Current trouble

Damaged wiring harness and connectors
Noise interference
Malfunction of wheel speed sensor
Malfunction of ASC-ECU

Past trouble

Carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble ( «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).

DIAGNOSIS

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

Scheme 4

Scheme 5

Scheme 6

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTIC TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C100A set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item No. 01: FL wheel speed sensor Q: Is the check result normal? YES: Go to Step 10 . NO: Go to Step 4.
STEP 4. Connector check: A-51 ASC-ECU connector, A-07 front wheel speed sensor < LH > connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the defective connector. Then go to Step 11 .
STEP 5. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool to ASC-ECU. Turn the ignition switch to the ON position. Measure the voltage between the front wheel speed sensor (LH) power supply terminal (signal terminal) No. 45 and the body ground and between the ground terminal No. 46 and the body ground. OK: 1 volt or less Q: Is the check result normal? YES: Go to Step 6. NO (Not normal at the terminal No. 45 or No. 46): Go to Step 8 .
STEP 6. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool to ASC-ECU. Measure the resistance between the front wheel speed sensor (LH) power supply terminal (signal terminal) No. 45 and the body ground and between the front wheel speed sensor (LH) ground terminal No. 46 and the body ground. OK: No continuity Q: Is the check result normal? YES: Go to Step 7. NO (Not normal at the terminal No. 45 or No. 46): Go to Step 8 .
STEP 7. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the ASC-ECU-side connector and harness-side connector, and then measure the voltage at the special tool connector side. Turn the ignition switch to the ON position. Measure the voltage between the front wheel speed sensor (LH) power supply terminal (signal terminal) No. 45 and body ground, and between the ground terminal No. 46 and body ground. OK: Terminal No. 45 and body ground: Battery positive voltage Terminal No. 46 and body ground: 1 volt or less Q: Is the check result normal? YES: Go to Step 8. NO: Go to Step 10 .
STEP 8. Check for wheel speed sensor < FL > as a single unit Refer to «INSTALLATION SERVICE POINT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) . Q: Is the check result normal? YES: Go to Step 9. NO: Replace the wheel speed sensor < FL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11 .
STEP 9. Wiring harness check between A-51 ASC-ECU connector terminal No. 45 and A-07 front wheel speed sensor < LH > connector terminal No. 1 and between A-51 ASC-ECU connector terminal No. 46 and A-07 front wheel speed sensor < LH > connector terminal No. 2. Check for open or short circuit in front wheel speed sensor < LH > circuit. Q: Is the check result normal? YES: Go to Step 10. NO: Repair the wiring harness. Then go to Step 11 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C100A set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C100A set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1015 Abnormality in FR wheel speed sensor circuit

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the voltage fluctuation in each wheel speed sensor circuit. If ASC-ECU detects the open or short circuit in the circuit, it will set a DTC.

Damaged wiring harness and connectors
Noise interference
Malfunction of wheel speed sensor
Malfunction of ASC-ECU

Carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble ( «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

Scheme 7

Scheme 8

Scheme 9

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1015 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item No. 02: FR wheel speed sensor Q: Is the check result normal? YES: Go to Step 10 . NO: Go to Step 4.
STEP 4. Connector check: A-51 ASC-ECU connector, A-02 front wheel speed sensor < RH > connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the defective connector. Then go to Step 11 .
STEP 5. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool to ASC-ECU. Turn the ignition switch to the ON position. Measure the voltage between the front wheel speed sensor < RH > power supply terminal (signal terminal) No. 34 and the body ground and between the ground terminal No. 33 and the body ground. OK: 1 volt or less Q: Is the check result normal? YES: Go to Step 6. NO (Not normal at the terminal No. 34 or No. 33): Go to Step 8 .
STEP 6. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool to ASC-ECU. Measure the resistance between the front wheel speed sensor < RH > power supply terminal (signal terminal) No. 34 and the body ground and between the front wheel speed sensor < RH > ground terminal No. 33 and the body ground. OK: No continuity Q: Is the check result normal? YES: Go to Step 7. NO (Not normal at the terminal No. 34 or No. 33): Go to Step 8 .
STEP 7. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the ASC-ECU-side connector and harness-side connector, and then measure the voltage at the special tool connector side. Turn the ignition switch to the ON position. Measure the voltage between the front wheel speed sensor < RH > power supply terminal (signal terminal) No. 34 and body ground, and between the ground terminal No. 33 and body ground. OK: Terminal No. 34 and body ground: Battery positive voltage Terminal No. 33 and body ground: 1 volt or less Q: Is the check result normal? YES: Go to Step 8. NO: Go to Step 10 .
STEP 8. Check for wheel speed sensor < FR > as a single unit Refer to «INSTALLATION SERVICE POINT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) . Q: Is the check result normal? YES: Go to Step 9. NO: Replace the wheel speed sensor < FR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11 .
STEP 9. Wiring harness check between A-51 ASC-ECU connector terminal No. 34 and A-02 front wheel speed sensor < RH > connector terminal No. 1 and between A-51 ASC-ECU connector terminal No. 33 and A-02 front wheel speed sensor < RH > connector terminal No. 2. Check for the open or short circuit in front wheel speed sensor < RH > circuit. Q: Is the check result normal? YES: Go to Step 10. NO: Repair the wiring harness. Then go to Step 11 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1015 set? YES: Replace the hydraulic unit (ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1015 set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 10

Scheme 10: DTC C1020 Abnormality in RL wheel speed sensor circuit

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the voltage fluctuation in each wheel speed sensor circuit. If ASC-ECU detects the open or short circuit in the circuit, it will set a DTC.

Damaged wiring harness and connectors
Noise interference
Malfunction of wheel speed sensor
Malfunction of ASC-ECU

Carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble ( «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

Scheme 11

Scheme 12

Scheme 13

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1020 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item No. 03: RL wheel speed sensor Q: Is the check result normal? YES: Go to Step 10 . NO: Go to Step 4.
STEP 4. Connector check: A-51 ASC-ECU connector, C-39 intermediate connector, D-15 intermediate connector, F-21 rear wheel speed sensor < LH > connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the defective connector. Then go to Step 11 .
STEP 5. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool to ASC-ECU. Turn the ignition switch to the ON position. Measure the voltage between the rear wheel speed sensor < LH > power supply terminal (signal terminal) No. 36 and the body ground, and between the rear wheel speed sensor < LH > ground terminal No. 37 and the body ground. OK: 1 volt or less Q: Is the check result normal? YES: Go to Step 6. NO (Not normal at the terminal No. 36 or No. 37): Go to Step 8 .
STEP 6. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool to ASC-ECU. Measure the resistance between the rear wheel speed sensor < LH > power supply terminal (signal terminal) No. 36 and the body ground, and between the rear wheel speed sensor < LH > ground terminal No. 37 and the body ground. OK: No continuity Q: Is the check result normal? YES: Go to Step 7. NO (Not normal at the terminal No. 36 or No. 37): Go to Step 8 .
STEP 7. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the ASC-ECU-side connector and harness-side connector, and then measure the voltage at the special tool connector side. Turn the ignition switch to the ON position. Measure the voltage between the rear wheel speed sensor < LH > power supply terminal (signal terminal) No. 36 and body ground, and between the ground terminal No. 37 and body ground. OK: Terminal No. 36 and body ground: Battery positive voltage Terminal No. 37 and body ground: 1 volt or less Q: Is the check result normal? YES: Go to Step 8. NO: Go to Step 10 .
STEP 8. Check for wheel speed sensor < RL > as a single unit Refer to «INSTALLATION SERVICE POINT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) . Q: Is the check result normal? YES: Go to Step 9. NO: Replace the wheel speed sensor < RL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11 .
STEP 9. Wiring harness check between A-51 ASC-ECU connector terminal No. 36 and F-21 rear wheel speed sensor < LH > connector terminal No. 1, and between A-51 ASC-ECU connector terminal No. 37 and F-21 rear wheel speed sensor < LH > connector terminal No. 2. Check for open or short circuit in rear wheel speed sensor < LH > circuit Q: Is the check result normal? YES: Go to Step 10. NO: Repair the wiring harness. Then go to Step 11 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1020 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1020 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C102B Abnormality in RR wheel speed sensor circuit

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the voltage fluctuation in each wheel speed sensor circuit. If ASC-ECU detects the open or short circuit in the circuit, it will set a DTC.

Damaged wiring harness and connectors
Noise interference
Malfunction of wheel speed sensor
Malfunction of ASC-ECU

Carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble ( «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

Scheme 14

Scheme 15

Scheme 16

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C102B set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item No. 04: RR wheel speed sensor Q: Is the check result normal? YES: Go to Step 10 . NO: Go to Step 4.
STEP 4. Connector check: A-51 ASC-ECU connector, C-39 intermediate connector, D-11 intermediate connector, F-02 rear wheel speed sensor < RH > connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the defective connector. Then go to Step 11 .
STEP 5. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool to ASC-ECU. Turn the ignition switch to the ON position. Measure the voltage between the rear wheel speed sensor < RH > power supply terminal (signal terminal) No. 43 and the body ground, and between the rear wheel speed sensor < RH > ground terminal No. 42 and the body ground. OK: 1 volt or less Q: Is the check result normal? YES: Go to Step 6. NO (Not normal at the terminal No. 43 or No. 42): Go to Step 8 .
STEP 6. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool to ASC-ECU. Measure the resistance between the rear wheel speed sensor < RH > power supply terminal (signal terminal) No. 43 and the body ground, and between the rear wheel speed sensor < RH > ground terminal No. 42 and the body ground. OK: No continuity Q: Is the check result normal? YES: Go to Step 7. NO (Not normal at the terminal No. 43 or No. 42): Go to Step 8 .
STEP 7. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the ASC-ECU-side connector and harness-side connector, and then measure the voltage at the special tool connector side. Turn the ignition switch to the ON position. Measure the voltage between the rear wheel speed sensor < RH > power supply terminal (signal terminal) No. 43 and body ground, and between the ground terminal No. 42 and body ground. OK: Terminal No. 43 and body ground: Battery positive voltage Terminal No. 42 and body ground: 1 volt or less Q: Is the check result normal? YES: Go to Step 8. NO: Go to Step 10 .
STEP 8. Check for wheel speed sensor < RR > as a single unit Refer to «INSTALLATION SERVICE POINT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) . Q: Is the check result normal? YES: Go to Step 9. NO: Replace the wheel speed sensor < RR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11 .
STEP 9. Wiring harness check between A-51 ASC-ECU connector terminal No. 43 and F-02 rear wheel speed sensor < RH > connector terminal No. 1, and between A-51 ASC-ECU connector terminal No. 42 and F-02 rear wheel speed sensor < RH > connector terminal No. 2. Check for open or short circuit in rear wheel speed sensor < RH > circuit Q: Is the check result normal? YES: Go to Step 10. NO: Repair the wiring harness. Then go to Step 11 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C102B set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C102B set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1011 Abnormality in FL wheel speed sensor signal

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ASC-ECU will set the relevant DTC.

Irregular change in the wheel speed sensor signal
Wheel speed sensor signal continuously indicates high value.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the wheel speed detection encoder
Wheel bearing malfunction
Malfunction of wheel speed sensor
Damaged wiring harness and connectors
External noise interference
Improper installation of the wheel speed sensor
Deformation of the wheel speed detection encoder
ASC-ECU malfunction
Disturbance of magnetization pattern for wheel speed detection encoder
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C100A is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C100A is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 17

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1011 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that DTC C100A is also set. Q: Is DTC C100A also set? YES: Perform the diagnosis for DTC C100A (Refer to «DTC C100A ABNORMALITY IN FL WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO: Go to Step 4.
STEP 4. Connector check: A-51 ASC-ECU connector, A-07 front wheel speed sensor < LH > connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the defective connector. Then go to Step 12 .
STEP 5. Wiring harness check between A-51 ASC-ECU connector terminal No. 45 and A-07 front wheel speed sensor < LH > connector terminal No. 1 and between A-51 ASC-ECU connector terminal No. 46 and A-07 front wheel speed sensor < LH > connector terminal No. 2. Q: Is the check result normal? YES: Go to Step 6. NO: Repair the wiring harness. Then go to Step 12 .
STEP 6. Check for wheel speed sensor < FL > installation Check how the wheel speed sensor < FL > is installed (Disconnection of wheel speed sensor < FL >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 7. NO: Reinstall the wheel speed sensor < FL > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 7.
STEP 7. Check for wheel speed sensor < FL > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 8. NO: Replace the wheel speed sensor < FL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11 .
STEP 8. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < FL > and the wheel speed detection magnet encoder. Check the wheel bearing < FL > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution__wheel-bearing-end-play-check) ). Q: Is the check result normal? YES: Go to Step 9. NO: Replace the wheel bearing < FL > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 12 .
STEP 9. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 10. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 12 . NO (Deformation): Replace the wheel bearing < FL > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 12 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1011 set? YES: Replace the wheel speed sensor < FL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1011 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12. NO: The procedure is complete.
STEP 12. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1011 set? YES: Return to Step 1 . NO: The procedure is complete.

Code No. C101C Abnormality in FR wheel speed sensor signal

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ASC-ECU will set the relevant DTC.

Irregular change in the wheel speed sensor signal
Wheel speed sensor signal continuously indicates high value.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the wheel speed detection encoder
Wheel bearing malfunction
Malfunction of wheel speed sensor
Damaged wiring harness and connectors
External noise interference
Improper installation of the wheel speed sensor
Deformation of the wheel speed detection encoder
ASC-ECU malfunction
Disturbance of magnetization pattern for wheel speed detection encoder
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C1015 is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C1015 is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C101C set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that DTC C1015 is also set. Q: Is DTC C1015 also set? YES: Perform the diagnosis for DTC C1015 (Refer to «DTC C1015 ABNORMALITY IN FR WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-c1015-abnormality-in-fr-wheel) ). NO: Go to Step 4.
STEP 4. Connector check: A-51 ASC-ECU connector, A-02 wheel speed sensor < FR > connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the defective connector. Then go to Step 12 .
STEP 5. Wiring harness check between A-51 ASC-ECU connector terminal No. 34 and A-02 wheel speed sensor < FR > connector terminal No. 1 and between A-51 ASC-ECU connector terminal No. 33 and A-02 wheel speed sensor < FR > connector terminal No. 2. Q: Is the check result normal? YES: Go to Step 6. NO: Repair the wiring harness. Then go to Step 12 .
STEP 6. Check for wheel speed sensor < FR > installation Check how the wheel speed sensor < FR > is installed (Disconnection of wheel speed sensor < FR >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 7. NO: Reinstall the wheel speed sensor < FR > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 7.
STEP 7. Check for wheel speed sensor < FR > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 8. NO: Replace the wheel speed sensor < FR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11 .
STEP 8. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < FR > and the wheel speed detection magnet encoder. Check the wheel bearing < FR > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution__wheel-bearing-end-play-check) ). Q: Is the check result normal? YES: Go to Step 9. NO: Replace the wheel bearing < FR > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 12 .
STEP 9. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 10. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 12 . NO (Deformation): Replace the wheel bearing < FR > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 12 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C101C set? YES: Replace the wheel speed sensor < FR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C101C set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12. NO: The procedure is complete.
STEP 12. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C101C set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 18

Scheme 18: DTC C1027 Abnormality in RL wheel speed sensor signal

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ASC-ECU will set the relevant DTC.

Irregular change in the wheel speed sensor signal
Wheel speed sensor signal continuously indicates high value.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the wheel speed detection encoder
Wheel bearing malfunction
Malfunction of wheel speed sensor
Damaged wiring harness and connectors
External noise interference
Improper installation of the wheel speed sensor
Deformation of the wheel speed detection encoder
ASC-ECU malfunction
Disturbance of magnetization pattern for wheel speed detection encoder
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C1020 is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C1020 is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied.

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 19

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1027 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the DTC C1020 is also set. Q: Is DTC C1020 also set? YES: Perform the diagnosis for the DTC C1020 (Refer to «DTC C1020 ABNORMALITY IN RL WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO: Go to Step 4.
STEP 4. Connector check: A-51 ASC-ECU connector, C-39 intermediate connector, D-15 intermediate connector, F-21 rear wheel speed sensor < LH > connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the defective connector. Then go to Step 12 .
STEP 5. Wiring harness check between A-51 ASC-ECU connector terminal No. 36 and F-21 rear wheel speed sensor < LH > connector terminal No. 1, and between A-51 ASC-ECU connector terminal No. 37 and F-21 rear wheel speed sensor < LH > connector terminal No. 2. Q: Is the check result normal? YES: Go to Step 6. NO: Repair the wiring harness. Then go to Step 12 .
STEP 6. Check for wheel speed sensor < RL > installation Check how the wheel speed sensor < RL > is installed (Disconnection of wheel speed sensor < RL >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 7. NO: Reinstall the wheel speed sensor < RL > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 7.
STEP 7. Check for wheel speed sensor < RL > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 8. NO: Replace the wheel speed sensor < RL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11 .
STEP 8. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < RL > and the wheel speed detection magnet encoder. Check the Rear wheel hub assembly < RL (FWD) > (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Check the wheel bearing < RL (AWD) > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 9. NO (FWD): Replace the rear wheel hub assembly < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 12 . NO (AWD): Replace the wheel bearing < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 12 .
STEP 9. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 10. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 12 . NO < Deformation (FWD) >: Replace the rear wheel hub assembly < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 12 . NO < Deformation (AWD) >: Replace the wheel bearing < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 12 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1027 set? YES: Replace the wheel speed sensor < RL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1027 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12. NO: The procedure is complete.
STEP 12. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1027 set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 20

Scheme 20: DTC C1032 Abnormality in RR wheel speed sensor signal

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ASC-ECU will set the relevant DTC.

Irregular change in the wheel speed sensor signal
Wheel speed sensor signal continuously indicates high value.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the wheel speed detection encoder
Wheel bearing malfunction
Malfunction of wheel speed sensor
Damaged wiring harness and connectors
External noise interference
Improper installation of the wheel speed sensor
Deformation of the wheel speed detection encoder
ASC-ECU malfunction
Disturbance of magnetization pattern for wheel speed detection encoder
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C102B is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C102B is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied.

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 21

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1032 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the DTC C102B is also set. Q: Is DTC C102B also set? YES: Perform the diagnosis for the DTC C102B (Refer to «DTC C102B ABNORMALITY IN RR WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-c102b-abnormality-in-rr-wheel) ). NO: Go to Step 4.
STEP 4. Connector check: A-51 ASC-ECU connector, C-39 intermediate connector, D-11 intermediate connector, F-02 rear wheel speed sensor < RH > connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the defective connector. Then go to Step 12 .
STEP 5. Wiring harness check between A-51 ASC-ECU connector terminal No. 43 and F-02 rear wheel speed sensor < RH > connector terminal No. 1, and between A-51 ASC-ECU connector terminal No. 42 and F-02 rear wheel speed sensor < RH > connector terminal No. 2. Q: Is the check result normal? YES: Go to Step 6. NO: Repair the wiring harness. Then go to Step 12 .
STEP 6. Check for wheel speed sensor < RR > installation Check how the wheel speed sensor < RR > is installed (Disconnection of wheel speed sensor < RR >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 7. NO: Reinstall the wheel speed sensor < RR > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 7.
STEP 7. Check for wheel speed sensor < RR > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 8. NO: Replace the wheel speed sensor < RR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11 .
STEP 8. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < RR > and the wheel speed detection magnet encoder. Check the Rear wheel hub assembly < RR (FWD) > (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Check the wheel bearing < RR (AWD) > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 9. NO (FWD): Replace the rear wheel hub assembly < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 12 . NO (AWD): Replace the wheel bearing < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 12 .
STEP 9. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 10. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 12 . NO < Deformation (FWD) >: Replace the rear wheel hub assembly < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 12 . NO < Deformation (AWD) >: Replace the wheel bearing < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 12 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1032 set? YES: Replace the wheel speed sensor < RR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1032 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12. NO: The procedure is complete.
STEP 12. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1032 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1014 Mutual monitoring of FL wheel speed sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ASC-ECU will set the relevant DTC.

Missing wheel speed sensor signal
Wheel speed sensor signal continuously indicates low value.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Wheel bearing malfunction
Deformation of the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the wheel speed detection encoder
Malfunction of wheel speed sensor
Improper installation of the wheel speed sensor
ASC-ECU malfunction
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C100A is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C100A is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied. Rotate only two wheels with drum tester

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1014 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that DTC C100A is also set. Q: Is DTC C100A also set? YES: Perform the diagnosis for DTC C100A (Refer to «DTC C100A ABNORMALITY IN FL WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO: Go to Step 4.
STEP 4. Check for wheel speed sensor < FL > installation Check how the wheel speed sensor < FL > is installed (Disconnection of wheel speed sensor < FL >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 5. NO: Reinstall the wheel speed sensor < FL > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 5.
STEP 5. Check for wheel speed sensor < FL > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 6. NO: Replace the wheel speed sensor < FL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9 .
STEP 6. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < FL > and the wheel speed detection magnet encoder. Check the wheel bearing < FL > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution__wheel-bearing-end-play-check) ). Q: Is the check result normal? YES: Go to Step 7. NO: Replace the wheel bearing (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 10 .
STEP 7. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 8. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 10 . NO (Deformation): Replace the wheel bearing < FL > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 10 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1014 set? YES: Replace the wheel speed sensor < FL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1014 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10. NO: The procedure is complete.
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1014 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C101F Mutual monitoring of FR wheel speed sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ASC-ECU will set the relevant DTC.

Missing wheel speed sensor signal
Wheel speed sensor signal continuously indicates low value.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Wheel bearing malfunction
Deformation of the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the wheel speed detection encoder
Malfunction of wheel speed sensor
Improper installation of the wheel speed sensor
ASC-ECU malfunction
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C1015 is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C1015 is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied. Rotate only two wheels with drum tester

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C101F set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that DTC C1015 is also set. Q: Is DTC C1015 also set? YES: Perform the diagnosis for DTC C1015 (Refer to «DTC C1015 ABNORMALITY IN FR WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-c1015-abnormality-in-fr-wheel) ). NO: Go to Step 4.
STEP 4. Check for wheel speed sensor < FR > installation Check how the wheel speed sensor < FR > is installed (Disconnection of wheel speed sensor < FR >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 5. NO: Reinstall the wheel speed sensor < FR > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 5.
STEP 5. Check for wheel speed sensor < FR > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 6. NO: Replace the wheel speed sensor < FR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9 .
STEP 6. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < FR > and the wheel speed detection magnet encoder. Check the wheel bearing < FR > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution__wheel-bearing-end-play-check) ). Q: Is the check result normal? YES: Go to Step 7. NO: Replace the wheel bearing < FR > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 10 .
STEP 7. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 8. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 10 . NO (Deformation): Replace the wheel bearing < FR > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 10 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C101F set? YES: Replace the wheel speed sensor < FR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C101F set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10. NO: The procedure is complete.
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C101F set? YES: Return to Step 1 . NO: The procedure is complete.

Code No. C102A: Mutual monitoring of RL wheel speed sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ASC-ECU will set the relevant DTC.

Missing wheel speed sensor signal
Wheel speed sensor signal continuously indicates low value.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Wheel bearing malfunction
Deformation of the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed detection encoder
Malfunction of wheel speed sensor
Improper installation of the wheel speed sensor
ASC-ECU malfunction
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C1020 is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C1020 is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied. Rotate only two wheels with drum tester

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C102A set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the DTC C1020 is also set. Q: Is DTC C1020 also set? YES: Perform the diagnosis for the DTC C1020 (Refer to «DTC C1020 ABNORMALITY IN RL WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO: Go to Step 4.
STEP 4. Check for wheel speed sensor < RL > installation Check how the wheel speed sensor < RL > is installed (Disconnection of wheel speed sensor < RL >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 5. NO: Reinstall the wheel speed sensor < RL > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 5.
STEP 5. Check for wheel speed sensor < RL > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 6. NO: Replace the wheel speed sensor < RL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9 .
STEP 6. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < RL > and the wheel speed detection magnet encoder. Check the Rear wheel hub assembly < RL (FWD) > (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Check the wheel bearing < RL (AWD) > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 7. NO (FWD): Replace the rear wheel hub assembly < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 10 . NO (AWD): Replace the wheel bearing < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 10 .
STEP 7. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 8. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. NO < Deformation (FWD) >: Replace the rear wheel hub assembly < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 10 . NO < Deformation (AWD) >: Replace the wheel bearing < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 10 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C102A set? YES: Replace the wheel speed sensor < RL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C102A set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10. NO: The procedure is complete.
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C102A set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1035 Mutual monitoring of RR wheel speed sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ASC-ECU will set the relevant DTC.

Missing wheel speed sensor signal
Wheel speed sensor signal continuously indicates low value.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Wheel bearing malfunction
Deformation of the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed detection encoder
Malfunction of wheel speed sensor
Improper installation of the wheel speed sensor
ASC-ECU malfunction
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C102B is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C102B is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied. Rotate only two wheels with drum tester

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1035 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the DTC C102B is also set. Q: Is the DTC C102B also set? YES: Perform the diagnosis for the DTC C102B (Refer to «DTC C102B ABNORMALITY IN RR WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-c102b-abnormality-in-rr-wheel) ). NO: Go to Step 4.
STEP 4. Check for wheel speed sensor < RR > installation Check how the wheel speed sensor < RR > is installed (Disconnection of wheel speed sensor < RR >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 5. NO: Reinstall the wheel speed sensor < RR > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 5.
STEP 5. Check for wheel speed sensor < RR > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 6. NO: Replace the wheel speed sensor < RR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9 .
STEP 6. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < RR > and the wheel speed detection magnet encoder. Check the Rear wheel hub assembly < RR (FWD) > (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Check the wheel bearing < RR (AWD) > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 7. NO (FWD): Replace the rear wheel hub assembly < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 10 . NO (AWD): Replace the wheel bearing < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 10 .
STEP 7. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 8. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. NO < Deformation (FWD) >: Replace the rear wheel hub assembly < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 10 . NO < Deformation (AWD) >: Replace the wheel bearing < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 10 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1035 set? YES: Replace the wheel speed sensor < RR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1035 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10. NO: The procedure is complete.
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1035 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1041 Abnormality in periodical signal for FL wheel speed sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any periodical drop is found in these sensor signals, ASC-ECU will set the relevant DTC.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Wheel bearing malfunction
Deformation of the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the wheel speed detection encoder
Malfunction of wheel speed sensor
Improper installation of the wheel speed sensor
ASC-ECU malfunction
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C100A is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C100A is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied. Rotate only two wheels with drum tester

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) Identifying). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1041 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that DTC C100A is also set. Q: Is DTC C100A also set YES: Perform the diagnosis for DTC C100A (Refer to «DTC C100A ABNORMALITY IN FL WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO: Go to Step 4.
STEP 4. Check for wheel speed sensor < FL > installation Check how the wheel speed sensor < FL > is installed (Disconnection of wheel speed sensor < FL >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 5. NO: Reinstall the wheel speed sensor < FL > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 5.
STEP 5. Check for wheel speed sensor < FL > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 6. NO: Replace the wheel speed sensor < FL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9 .
STEP 6. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < FL > and the wheel speed detection magnet encoder. Check the wheel bearing < FL > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution__wheel-bearing-end-play-check) ). Q: Is the check result normal? YES: Go to Step 7. NO: Replace the wheel bearing < FL > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 10 .
STEP 7. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 8. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 10 . NO (Deformation): Replace the wheel bearing < FL > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 10 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1041 set? YES: Replace the wheel speed sensor < FL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1041 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10. NO: The procedure is complete.
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1041 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1042 Abnormality in periodical signal for FR wheel speed sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any periodical drop is found in these sensor signals, ASC-ECU will set the relevant DTC.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Wheel bearing malfunction
Deformation of the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the wheel speed detection encoder
Malfunction of wheel speed sensor
Improper installation of the wheel speed sensor
ASC-ECU malfunction
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C1015 is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C1015 is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied. Rotate only two wheels with drum tester

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1042 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that DTC C1015 is also set. Q: Is DTC C1015 also set? YES: Perform the diagnosis for DTC C1015 (Refer to «DTC C1015 ABNORMALITY IN FR WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-c1015-abnormality-in-fr-wheel) ). NO: Go to Step 4.
STEP 4. Check for wheel speed sensor < FR > installation Check how the wheel speed sensor < FR > is installed (Disconnection of wheel speed sensor < FR >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 5. NO: Reinstall the wheel speed sensor < FR > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 5.
STEP 5. Check for wheel speed sensor < FR > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 6. NO: Replace the wheel speed sensor < FR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9 .
STEP 6. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < FR > and the wheel speed detection magnet encoder. Check the wheel bearing < FR > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution__wheel-bearing-end-play-check) ). Q: Is the check result normal? YES: Go to Step 7. NO: Replace the wheel bearing < FR > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 10 .
STEP 7. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 8. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 10 . NO (Deformation): Replace the wheel bearing < FR > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 10 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1042 set? YES: Replace the wheel speed sensor < FR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1042 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10. NO: The procedure is complete.
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1042 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1043: Abnormality in periodical signal for RL wheel speed sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any periodical drop is found in these sensor signals, ASC-ECU will set the relevant DTC.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Wheel bearing malfunction
Deformation of the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed detection encoder
Malfunction of wheel speed sensor
Improper installation of the wheel speed sensor
ASC-ECU malfunction
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C1020 is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C1020 is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied. Rotate only two wheels with drum tester

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1043 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the DTC C1020 is also set. Q: Is DTC C1020 also set? YES: Perform the diagnosis for the DTC C1020 (Refer to «DTC C1020 ABNORMALITY IN RL WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO: Go to Step 4.
STEP 4. Check for wheel speed sensor < RL > installation Check how the wheel speed sensor < RL > is installed (Disconnection of wheel speed sensor < RL >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 5. NO: Reinstall the wheel speed sensor < RL > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 5.
STEP 5. Check for wheel speed sensor < RL > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 6. NO: Replace the wheel speed sensor < RL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9 .
STEP 6. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < RL > and the wheel speed detection magnet encoder. Check the Rear wheel hub assembly < RL (FWD) > (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Check the wheel bearing < RL (AWD) > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 7. NO (FWD): Replace the rear wheel hub assembly < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 10 . NO (AWD): Replace the wheel bearing < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 10 .
STEP 7. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 8. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. NO < Deformation (FWD) >: Replace the rear wheel hub assembly < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 10 . NO < Deformation (AWD) >: Replace the wheel bearing < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 10 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1043 set? YES: Replace the wheel speed sensor < RL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1043 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10. NO: The procedure is complete.
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1043 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1044 Abnormality in periodical signal for RR wheel speed sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

ASC-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any periodical drop is found in these sensor signals, ASC-ECU will set the relevant DTC.

Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Wheel bearing malfunction
Deformation of the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed detection encoder
Malfunction of wheel speed sensor
Improper installation of the wheel speed sensor
ASC-ECU malfunction
The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed

When DTC C102B is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).
When DTC C102B is not set, the following conditions may be present: Some wheels slip Unstable vehicle attitude External noise interference Vehicle ran with the parking brake applied. Rotate only two wheels with drum tester

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1044 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the DTC C102B is also set. Q: Is the DTC C102B also set? YES: Perform the diagnosis for the DTC C102B (Refer to «DTC C102B ABNORMALITY IN RR WHEEL SPEED SENSOR CIRCUIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-c102b-abnormality-in-rr-wheel) ). NO: Go to Step 4.
STEP 4. Check for wheel speed sensor < RR > installation Check how the wheel speed sensor < RR > is installed (Disconnection of wheel speed sensor < RR >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 5. NO: Reinstall the wheel speed sensor < RR > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 5.
STEP 5. Check for wheel speed sensor < RR > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 6. NO: Replace the wheel speed sensor < RR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9 .
STEP 6. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < RR > and the wheel speed detection magnet encoder. Check the Rear wheel hub assembly < RR (FWD) > (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Check the wheel bearing < RR (AWD) > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 7. NO (FWD): Replace the rear wheel hub assembly < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 10 . NO (AWD): Replace the wheel bearing < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 10 .
STEP 7. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 8. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. NO < Deformation (FWD) >: Replace the rear wheel hub assembly < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 10 . NO < Deformation (AWD) >: Replace the wheel bearing < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 10 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1044 set? YES: Replace the wheel speed sensor < RR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1044 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10. NO: The procedure is complete.
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1044 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1046 FL wheel speed sensor control phase time exceeded

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

This DTC is set if any malfunction below is found

When the brake fluid pressure is decreased for a long time.
When the brake fluid pressure is held for a long time.

Note. ASC controls the vehicle based on the wheel speed signal. When the brake fluid pressure is decreased or held for an abnormally long time, the wheel speed sensor signal may have a problem.

PROBABLE CAUSES

Damaged wiring harness and connectors
External noise interference
Malfunction of wheel speed sensor
ASC-ECU malfunction
Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the magnetic encoder for wheel speed detection
Wheel bearing malfunction
Improper installation of the wheel speed sensor
Deformation of the magnetic encoder for wheel speed detection
Disturbance of magnetization pattern for magnetic encoder for wheel speed detection
Missing teeth of the magnetic encoder for wheel speed detection

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1046 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the DTC C100A, C1011, C1014, or C1041 is also set. Q: Is the DTC C100A, C1011, C1014, or C1041 also set? YES: Carry out the diagnosis for the relevant DTC. NO: Go to Step 4.
STEP 4. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item No. 01: FL wheel speed sensor Q: Is the check result normal? YES: Go to Step 11 . NO: Go to Step 5.
STEP 5. Connector check: A-51 ASC-ECU connector, A-07 front wheel speed sensor < LH > connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair the defective connector. Then go to Step 13 .
STEP 6. Wiring harness check between A-51 ASC-ECU connector terminal No. 45 and A-07 front wheel speed sensor < LH > connector terminal No. 1 and between A-51 ASC-ECU connector terminal No. 46 and A-07 front wheel speed sensor < LH > connector terminal No. 2. Q: Is the check result normal? YES: Go to Step 7. NO: Repair the wiring harness. Then go to Step 13 .
STEP 7. Check for wheel speed sensor < FL > installation Check how the wheel speed sensor < FL > is installed (Disconnection of wheel speed sensor < FL >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 8. NO: Reinstall the wheel speed sensor < FL > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 8.
STEP 8. Check for wheel speed sensor < FL > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 9. NO: Replace the wheel speed sensor < FL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12 .
STEP 9. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < FL > and the wheel speed detection magnet encoder. Check the wheel bearing < FL > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution__wheel-bearing-end-play-check) ). Q: Is the check result normal? YES: Go to Step 10. NO: Replace the wheel bearing < FL > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 13 .
STEP 10. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 11. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 13 . NO (Deformation): Replace the wheel bearing < FL > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 13 .
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1046 set? YES: Replace the wheel speed sensor < FL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 12. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1046 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 13. NO: The procedure is complete.
STEP 13. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1046 set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 22

Scheme 22: DTC C1047 FR wheel speed sensor control phase time exceeded

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

This DTC is set if any malfunction below is found

When the brake fluid pressure is decreased for a long time.
When the brake fluid pressure is held for a long time.

Note. ASC controls the vehicle based on the wheel speed signal. When the brake fluid pressure is decreased or held for an abnormally long time, the wheel speed sensor signal may have a problem.

Damaged wiring harness and connectors
External noise interference
Malfunction of wheel speed sensor
ASC-ECU malfunction
Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the magnetic encoder for wheel speed detection
Wheel bearing malfunction
Improper installation of the wheel speed sensor
Deformation of the magnetic encoder for wheel speed detection
Disturbance of magnetization pattern for magnetic encoder for wheel speed detection
Missing teeth of the magnetic encoder for wheel speed detection

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1047 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the DTC C1015, C101C, C101F, or C1042 is also set. Q: Is the DTC C1015, C101C, C101F, or C1042 also set? YES: Carry out the diagnosis for the relevant DTC. NO: Go to Step 4.
STEP 4. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item No. 02: FR wheel speed sensor Q: Is the check result normal? YES: Go to Step 11 . NO: Go to Step 5.
STEP 5. Connector check: A-51 ASC-ECU connector, A-02 front wheel speed sensor < RH > connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair the defective connector. Then go to Step 13 .
STEP 6. Wiring harness check between A-51 ASC-ECU connector terminal No. 34 and A-02 front wheel speed sensor < RH > connector terminal No. 1 and between A-51 ASC-ECU connector terminal No. 33 and A-02 front wheel speed sensor < RH > connector terminal No. 2. Q: Is the check result normal? YES: Go to Step 7. NO: Repair the wiring harness. Then go to Step 13 .
STEP 7. Check for wheel speed sensor < FR > installation Check how the wheel speed sensor < FR > is installed (Disconnection of wheel speed sensor < FR >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 8. NO: Reinstall the wheel speed sensor < FR > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 8.
STEP 8. Check for wheel speed sensor < FR > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 9. NO: Replace the wheel speed sensor < FR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12 .
STEP 9. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < FR > and the wheel speed detection magnet encoder. Check the wheel bearing < FR > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution__wheel-bearing-end-play-check) ). Q: Is the check result normal? YES: Go to Step 10. NO: Replace the wheel bearing < FR > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 13 .
STEP 10. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 11. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 13 . NO (Deformation): Replace the wheel bearing < FR > (Refer to «FRONT AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution) ). Then go to Step 13 .
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1047 set? YES: Replace the wheel speed sensor < FR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 12. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1047 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 13. NO: The procedure is complete.
STEP 13. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1047 set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 23

Scheme 23: DTC C1048 RL wheel speed sensor control phase time exceeded

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

This DTC is set if any malfunction below is found

When the brake fluid pressure is decreased for a long time.
When the brake fluid pressure is held for a long time.

Note. ASC controls the vehicle based on the wheel speed signal. When the brake fluid pressure is decreased or held for an abnormally long time, the wheel speed sensor signal may have a problem.

Damaged wiring harness and connectors
External noise interference
Malfunction of wheel speed sensor
ASC-ECU malfunction
Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the wheel speed detection encoder
Wheel bearing malfunction
Improper installation of the wheel speed sensor
Deformation of the wheel speed detection encoder
Disturbance of magnetization pattern for wheel speed detection encoder
Missing teeth of the wheel speed detection encoder

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1048 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the DTC C1020, C1027, C102A, or C1043 is also set. Q: Is the DTC C1020, C1027, C102A, or C1043 also set? YES: Carry out the diagnosis for the relevant DTC. NO: Go to Step 4.
STEP 4. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item No. 03: RL wheel speed sensor Q: Is the check result normal? YES: Go to Step 11 . NO: Go to Step 5.
STEP 5. Connector check: A-51 ASC-ECU connector, C-39 intermediate connector, D-15 intermediate connector, F-21 rear wheel speed sensor < LH > connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair the defective connector. Then go to Step 13 .
STEP 6. Wiring harness check between A-51 ASC-ECU connector terminal No. 36 and F-21 rear wheel speed sensor < LH > connector terminal No. 1, and between A-51 ASC-ECU connector terminal No. 37 and F-21 rear wheel speed sensor < LH > connector terminal No. 2. Q: Is the check result normal? YES: Go to Step 7. NO: Repair the wiring harness. Then go to Step 13 .
STEP 7. Check for wheel speed sensor < RL > installation Check how the wheel speed sensor < RL > is installed (Disconnection of wheel speed sensor < RL >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 8. NO: Reinstall the wheel speed sensor < RL > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 8.
STEP 8. Check for wheel speed sensor < RL > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 9. NO: Replace the wheel speed sensor < RL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12 .
STEP 9. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < RL > and the wheel speed detection magnet encoder. Check the Rear wheel hub assembly < RL (FWD) > (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Check the wheel bearing < RL (AWD) > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 10. NO (FWD): Replace the rear wheel hub assembly < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 13 . NO (AWD): Replace the wheel bearing < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 13 .
STEP 10. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 11. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 13 . NO < Deformation (FWD) >: Replace the rear wheel hub assembly < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 13 . NO < Deformation (AWD) >: Replace the wheel bearing < RL > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 13 .
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1048 set? YES: Replace the wheel speed sensor < RL > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 12. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1048 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 13. NO: The procedure is complete.
STEP 13. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1048 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1049 RR wheel speed sensor control phase time exceeded

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the north and south pole of magnet are arranged alternately) for detecting the wheel speed, which rotates at the same speed of the wheels, and the wheel speed sensor. This detecting section outputs the frequency pulse signals in proportion to the wheel speed.
The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

This DTC is set if any malfunction below is found

When the brake fluid pressure is decreased for a long time.
When the brake fluid pressure is held for a long time.

Note. ASC controls the vehicle based on the wheel speed signal. When the brake fluid pressure is decreased or held for an abnormally long time, the wheel speed sensor signal may have a problem.

Damaged wiring harness and connectors
External noise interference
Malfunction of wheel speed sensor
ASC-ECU malfunction
Excessive gap between the wheel speed sensor and the wheel speed detection encoder
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the wheel speed detection encoder
Wheel bearing malfunction
Improper installation of the wheel speed sensor
Deformation of the wheel speed detection encoder
Disturbance of magnetization pattern for wheel speed detection encoder
Missing teeth of the wheel speed detection encoder

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1049 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the DTC C102B, C1032, C1035, or C1044 is also set. Q: Is the DTC C102B, C1032, C1035, or C1044 also set? YES: Carry out the diagnosis for the relevant DTC. NO: Go to Step 4.
STEP 4. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item No. 04: RR wheel speed sensor Q: Is the check result normal? YES: Go to Step 11 . NO: Go to Step 5.
STEP 5. Connector check: A-51 ASC-ECU connector, C-39 intermediate connector, D-11 intermediate connector, F-02 rear wheel speed sensor < RH > connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair the defective connector. Then go to Step 13 .
STEP 6. Wiring harness check between A-51 ASC-ECU connector terminal No. 43 and F-02 rear wheel speed sensor < RH > connector terminal No. 1, and between A-51 ASC-ECU connector terminal No. 42 and F-02 rear wheel speed sensor < RH > connector terminal No. 2. Q: Is the check result normal? YES: Go to Step 7. NO: Repair the wiring harness. Then go to Step 13 .
STEP 7. Check for wheel speed sensor < RR > installation Check how the wheel speed sensor < RR > is installed (Disconnection of wheel speed sensor < RR >, loose mounting bolt, etc.). Q: Is the check result normal? YES: Go to Step 8. NO: Reinstall the wheel speed sensor < RR > correctly (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 8.
STEP 8. Check for wheel speed sensor < RR > output current Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) . Q: Is the check result normal? YES: Go to Step 9. NO: Replace the wheel speed sensor < RR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12 .
STEP 9. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor < RR > and the wheel speed detection magnet encoder. Check the Rear wheel hub assembly < RR (FWD) > (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Check the wheel bearing < RR (AWD) > for looseness (Refer to «WHEEL BEARING PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 10. NO (FWD): Replace the rear wheel hub assembly < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 13 . NO (AWD): Replace the wheel bearing < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 13 .
STEP 10. Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES: Go to Step 11. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 13 . NO < Deformation (FWD) >: Replace the rear wheel hub assembly < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-fwd-except-lancer-evolution) ). Then go to Step 13 . NO < Deformation (AWD) >: Replace the wheel bearing < RR > (Refer to «REAR AXLE HUB ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/differentials-drive-axles/#rear-axle-awd-except-lancer-evolution) ). Then go to Step 13 .
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1049 set? YES: Replace the wheel speed sensor < RR > (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 12. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 12. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1049 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 13. NO: The procedure is complete.
STEP 13. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1049 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C104B Abnormality in FL wheel inlet valve system; DTC C104F Abnormality in FR wheel inlet valve system; DTC C1053 Abnormality in RL wheel inlet valve system; DTC C1057 Abnormality in RR wheel inlet valve system; DTC C105F Abnormality in FL wheel outlet valve system; DTC C1063 Abnormality in FR wheel outlet valve system; DTC C1067 Abnormality in RL wheel outlet valve system; DTC C105B Abnormality in RR wheel outlet valve system; DTC C1200 Abnormality in FL/RR wheel cut valve system; DTC C1204 Abnormality in FR/RL wheel cut valve system; DTC C1208 Abnormality in FL/RR wheel suction valve system; DTC C120C Abnormality in FR/RL wheel suction valve system

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU contains the power supply circuit (terminal No. 32) for the solenoid valve. The solenoid valve is energized by the valve relay, which is incorporated in ASC-ECU.
The valve relay, which is incorporated in ASC-ECU, is always energizing the solenoid valve unless the initial check is in progress when the ignition switch is turned on, and the recurrent system check is in progress.
ASC-ECU activates the solenoid valve by turning on its driving transistor.

These DTCs will be set under the cases below

The solenoid valve is not energized even after ASC-ECU has turned on the driving transistor (Open circuit is present in the power supply circuit to the ASC-ECU solenoid valve, or the valve relay has failed).
After ASC-ECU has turned off the driving transistor, the solenoid valve still remains energized (short in the solenoid valve circuit).
When a solenoid valve failure is detected

ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is the relevant DTC set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Check whether the DTC is reset. Q: Is the relevant DTC set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 4. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 4. Check whether the DTC is reset. Q: Is the relevant DTC set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 24

Scheme 24: DTC C2104 Faulty valve power supply circuit

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU contains the power supply circuit (terminal No. 32) for the solenoid valve. The solenoid valve is energized by the valve relay, which is incorporated in ASC-ECU.
The valve relay, which is incorporated in ASC-ECU, is always energizing the solenoid valve unless the initial check is in progress when the ignition switch is turned on, or the recurrent system check is in progress.

This DTC will be set when the solenoid valve supply voltage is not within the standard value.

Fusible link malfunction
Damaged wiring harness and connectors
Abnormality in battery or generator
ASC-ECU malfunction

Carry out diagnosis with particular emphasis on wiring harness and connector failures between the power supply circuit (terminal No. 32) to ASC-ECU solenoid valve or ground circuit (terminal No. 16 and 47). For diagnosis procedures, refer to How to treat past trouble ( «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

Scheme 25

Scheme 26

Scheme 27

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C2104 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Battery check Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) . Q: Is the battery in good condition? YES: Go to Step 5 . NO: Replace the battery. Then go to Step 4.
STEP 4. Charging system check Refer to «ON-VEHICLE SERVICE/GENERATOR OUTPUT LINE VOLTAGE DROP TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/charging-system/#charging-system-except-lancer-evolution) . Q: Is the charging system in good condition? YES: Go to Step 5. NO: Repair or replace the charging system component(s). Then go to Step 11 .
STEP 5. Connector check: A-51 ASC-ECU connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair the defective connector. Then go to Step 11 .
STEP 6. Fusible link check: Check the fusible link No. 27. Visually check for open circuit in the fusible link No. 27. Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 7.
STEP 7. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Disconnect the fusible link No. 27. Measure the resistance between the terminal No. 32 and the body ground. OK: No continuity Q: Is the check result normal? YES: Replace the fusible link No. 27. Then go to Step 11 . NO: The short circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 32 and the fusible link No. 27, and then replace the fusible link No. 27. Then go to Step 11 .
STEP 8. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the voltage between the terminal No. 32 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 9. NO: The open circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 32 and the fusible link No. 27. Then go to Step 11 .
STEP 9. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the resistance between the terminal No. 16 and the body ground, and between the terminal No. 47 and the body ground. OK: Continuity exists (2 ohms or less) Q: Is the check result normal? YES: Go to Step 10. NO: An open circuit may be present in the ground circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 16 and the body ground, and between the A-51 ASC-ECU connector terminal No. 47 and the body ground. Then go to Step 11 .
STEP 10. Check whether the DTC is reset. Q: Is DTC C2104 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Q: Is DTC C2104 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1073 Faulty motor drive circuit

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU contains the power supply circuit (terminal No. 1) for the pump motor. The pump motor is energized by the motor switch, which is incorporated in ASC-ECU.
The pump motor switch, which is incorporated in ASC-ECU, is always off unless the motor solenoid valve check is activated when the vehicle is started.
ASC-ECU activates the pump motor by turning on the ECU built-in pump motor switch.

If the pump motor switch voltage drop indicates high value when the pump motor operates or after the operation, the pump motor operation is stopped and this DTC is set.

Fusible link malfunction
Damaged wiring harness and connectors
Abnormality in battery or generator
ASC-ECU malfunction

Carry out diagnosis with particular emphasis on wiring harness and connector failures between the power supply circuit (A-51 ASC-ECU connector terminal No. 1) to the ASC-ECU motor and the ground circuit (A-51 ASC-ECU connector terminal No. 16 and 47). For diagnosis procedures, refer to How to treat past trouble ( «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

Scheme 28

Scheme 29

Scheme 30

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1073 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Battery check Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) . Q: Is the battery in good condition? YES: Go to Step 5 . NO: Replace the battery. Then go to Step 4.
STEP 4. Charging system check Refer to «ON-VEHICLE SERVICE/GENERATOR OUTPUT LINE VOLTAGE DROP TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/charging-system/#charging-system-except-lancer-evolution) . Q: Is the charging system in good condition? YES: Go to Step 5. NO: Repair or replace the charging system component(s). Then go to Step 11 .
STEP 5. Connector check: A-51 ASC-ECU connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair the defective connector. Then go to Step 11 .
STEP 6. Fusible link check: Check the fusible link No. 26. Visually check for open circuit in the fusible link No. 26. Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 7.
STEP 7. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Disconnect the fusible link No. 26. Measure the resistance between the terminal No. 1 and the body ground. OK: No continuity Q: Is the check result normal? YES: Replace the fusible link No. 26. Then go to Step 11 . NO: The short circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 1 and the fusible link No. 26, and then replace the fusible link No. 26. Then go to Step 11 .
STEP 8. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the voltage between the terminal No. 1 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 9. NO: The open circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 1 and the fusible link No. 26. Then go to Step 11 .
STEP 9. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the resistance between the terminal No. 16 and the body ground, and between the terminal No. 47 and the body ground. OK: Continuity exists (2 ohms or less) Q: Is the check result normal? YES: Go to Step 10. NO: An open circuit may be present in the ground circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 16 and the body ground, and between the A-51 ASC-ECU connector terminal No. 47 and the body ground. Then go to Step 11 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1073 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1073 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C2116 Low or high power supply voltage in pump motor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU contains the power supply circuit (terminal No. 1) for the pump motor. The pump motor is energized by the motor switch, which is incorporated in ASC-ECU.
The pump motor switch, which is incorporated in ASC-ECU, is always off unless the motor solenoid valve check is activated when the vehicle is started.
ASC-ECU activates the pump motor by turning on the ECU built-in pump motor switch.

When the power supply voltage of the pump motor, which is not in operation, is abnormally low for a prolonged period
When the power supply voltage of the pump motor, which is not in operation, is abnormally high for a prolonged period

Fusible link malfunction
Damaged wiring harness and connectors
Abnormality in battery or generator
ASC-ECU malfunction

Carry out diagnosis with particular emphasis on wiring harness and connector failures between the power supply circuit (A-51 ASC-ECU connector terminal No. 1) to the ASC-ECU motor and the ground circuit (A-51 ASC-ECU connector terminal No. 16 and 47). For diagnosis procedures, refer to How to treat past trouble ( «HOW TO USE TROUBLESHOOTING/HOW TO TREAT PAST TROUBLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-treat-past-trouble) ).

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C2116 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Battery check Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) . Q: Is the battery in good condition? YES: Go to Step 4. NO: Replace the battery. Then go to Step 11 .
STEP 4. Charging system check Refer to «ON-VEHICLE SERVICE/GENERATOR OUTPUT LINE VOLTAGE DROP TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/charging-system/#charging-system-except-lancer-evolution) . Q: Is the charging system in good condition? YES: Go to Step 5. NO: Repair or replace the charging system component(s). Then go to Step 11 .
STEP 5. Connector check: A-51 ASC-ECU connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair the defective connector. Then go to Step 11 .
STEP 6. Fusible link check: Check the fusible link No. 26. Visually check for open circuit in the fusible link No. 26. Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 7.
STEP 7. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Disconnect the fusible link No. 26. Measure the resistance between the terminal No. 1 and the body ground. OK: No continuity Q: Is the check result normal? YES: Replace the fusible link No. 26. Then go to Step 11 . NO: The short circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 1 and the fusible link No. 26, and then replace the fusible link No. 26. Then go to Step 11 .
STEP 8. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the voltage between the terminal No. 1 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 9. NO: The open circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 1 and the fusible link No. 26. Then go to Step 11 .
STEP 9. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the resistance between the terminal No. 16 and the body ground, and between the terminal No. 47 and the body ground. OK: Continuity exists (2 ohms or less) Q: Is the check result normal? YES: Go to Step 10. NO: An open circuit may be present in the ground circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 16 and the body ground, and between the A-51 ASC-ECU connector terminal No. 47 and the body ground. Then go to Step 11 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C2116 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 11. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C2116 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C121D Abnormality in brake fluid pressure sensor circuit

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

The hydraulic sensor is incorporated in the hydraulic unit. When the brake pedal is depressed, the pressure sensor detects the brake pressure applied from the master cylinder, converts this pressure into the voltage signal, and outputs it.

When the pressure sensor output signal is not within the standard value range, ASC-ECU sets this DTC.

Incorrect brake pedal height
Incorrect adjustment of the stoplight switch
Master cylinder malfunction
Brake booster malfunction
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C121D set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Brake pedal check Refer to «ON-VEHICLE SERVICE/BRAKE PEDAL CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pedal-check-and-adjustment) . Q: Is the check result normal? YES: Go to Step 4. NO: Go to «ON-VEHICLE SERVICE/BRAKE PEDAL CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pedal-check-and-adjustment) . Then go to Step 7 .
STEP 4. Check the installation condition of the stoplight switch. Refer to «ON-VEHICLE SERVICE/BRAKE PEDAL CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pedal-check-and-adjustment) . Q: Is the check result normal? YES: Go to Step 5. NO: Install the stoplight switch correctly (Refer to «ON-VEHICLE SERVICE/BRAKE PEDAL CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pedal-check-and-adjustment) ), and then go to Step 7 .
STEP 5. Brake booster check Refer to «ON-VEHICLE SERVICE/BRAKE BOOSTER OPERATING CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) . Q: Is the check result normal? YES: Go to Step 6. NO: After replacing the brake booster, go to Step 7 .
STEP 6. Check whether the DTC is reset. Q: Is DTC C121D set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 7. NO: The trouble can be an intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 7. Check whether the DTC is reset. Q: Is DTC C121D set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C121E Abnormality in brake fluid pressure sensor output signal

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

This DTCs will be set under the cases below

When the pressure sensor offset is not within the standard value range
When the estimated pressure sensor temperature is not normal

Incorrect adjustment of brake pedal height
Master cylinder malfunction
Brake booster malfunction
Incorrect installation position of stoplight switch
Malfunction of the stoplight switch
Brake drag
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 31

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C121E set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Brake pedal check Refer to «ON-VEHICLE SERVICE/BRAKE PEDAL CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pedal-check-and-adjustment) . Q: Is the check result normal? YES: Go to Step 4. NO: Adjust the brake pedal height. (Refer to «ON-VEHICLE SERVICE/BRAKE PEDAL CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pedal-check-and-adjustment) ). Then go to Step 9 .
STEP 4. Check for stoplight switch installation Refer to «ON-VEHICLE SERVICE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) . Q: Is the check result normal? YES: Go to Step 5. NO: Install the stoplight switch correctly (Refer to «ON-VEHICLE SERVICE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) ), and then go to Step 9 .
STEP 5. stoplight switch continuity check Remove the stoplight switch (Refer to «BRAKE PEDAL»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) ). Connect the circuit tester (ohms range) to the stoplight switch connector terminals No. 1 and 2. When no continuity is detected with the plunger pressed from the edge of the outer case by the dimension shown in the illustration and when continuity is detected with the plunger released, the stoplight switch is in good condition. Q: Is the check result normal? YES: Go to Step 6. NO: Replace the stoplight switch (Refer to «BRAKE PEDAL»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) ), and then go to Step 9 .
STEP 6. Brake drag check Check the brake system for drag. Q: Is the check result normal? YES: Go to Step 7. NO: Repair the brake drag, and then go to Step 9 .
STEP 7. Brake booster check Refer to «ON-VEHICLE SERVICE/BRAKE BOOSTER OPERATION CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) . Q: Is the check result normal? YES: Go to Step 8. NO: Replace the brake booster (Refer to «MASTER CYLINDER ASSEMBLY AND BRAKE BOOSTER»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) < Except RALLIART >, «MASTER CYLINDER AND BRAKE BOOSTER»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) < RALLIART >), and then go to Step 9 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C121E set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9. NO: The trouble can be an intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C121E set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 32

Scheme 32: DTC C1000: Abnormality in stoplight switch circuit

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

CIRCUIT OPERATION

ETACS-ECU sends the ON signal generated when the brake pedal is depressed and OFF signal generated when it is released to ABS-ECU via the CAN bus lines.

This DTC is set in the following case.

When the vehicle has run for a long time with the stoplight switch turned ON.
When the OFF status of the stoplight switch does not match the vehicle attitude

Improper adjustment of stoplight switch installation position
Malfunction of the stoplight switch
Damaged wiring harness and connectors
Malfunction of ETACS-ECU
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1000 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Battery check Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) . Q: Is the battery in good condition? YES: Go to Step 4. NO: Charge or replace the battery, and go to Step 17 .
STEP 4. Stoplight operation check Check the stoplight operation when the brake pedal is depressed. Check that the stoplight illuminates when the brake pedal is depressed and that it goes out when the brake pedal is released. OK: When the brake pedal is released: OFF When the brake pedal is depressed: Illuminates Q: Is the check result normal? YES: Go to Step 18 . NO: Go to Step 5.
STEP 5. Check stoplight switch installation Refer to «ON-VEHICLE SERVICE/BRAKE PEDAL CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pedal-check-and-adjustment) . Q: Is the check result normal? YES: Go to Step 6. NO: Install the stop light switch correctly. (Refer to «ON-VEHICLE SERVICE/BRAKE PEDAL CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pedal-check-and-adjustment) .) Then go to Step 22 .
STEP 6. Stop light switch continuity check Remove the stoplight switch (Refer to «BRAKE PEDAL»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) ). Connect the circuit tester (ohms range) to the stoplight switch connector terminals No. 1 and 2. When no continuity is detected with the plunger pressed from the edge of the outer case by the dimension shown in the illustration and when continuity is detected with the plunger released, the stoplight switch is in good condition. Q: Is the check result normal? YES: Go to Step 7. NO: Replace the stoplight switch. (Refer to «BRAKE PEDAL»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) .) Then go to Step 22 .
STEP 7. ETACS-ECU fuse No. 2 check Q: Is the check result normal? YES: Go to Step 12 . NO: Go to Step 8.
STEP 8. Connector check: C-304 ETACS-ECU connector, C-312 ETACS-ECU connector, C-32 stoplight switch connector, C-39 Intermediate connector, D-11 Intermediate connector, D-14 Intermediate connector, F-23 Intermediate connector < LANCER >, F-30 Intermediate connector < LANCER SPORTBACK >, F-06 rear combination light (stoplight: RH) connector, F-20 rear combination light (stoplight: LH) connector, F-10 high-mounted stoplight connector Q: Is the check result normal? YES: Go to Step 9. NO: Repair the damaged connector, and then replace fuse No. 2. Then go to Step 22 .
STEP 9. Resistance measurement at C-32 stoplight switch connector Disconnect C-32 stop light switch connector, and measure at the wiring harness side. Disconnect C-312 ETACS-ECU connector and C-39 joint connector. Measure the resistance between the terminal No. 1 and the body ground. OK: No continuity Q: Is the check result normal? YES: Go to Step 10. NO: A short circuit may be present in the wiring harness between C-39 joint connector terminal No. 9 and C-32 stoplight switch connector terminal No. 1 or between C-312 ETACS-ECU connector terminal No. 16 and C-32 stoplight switch connector terminal No. 1. Repair the wiring harness if necessary, and then replace fuse No. 2. Then go to Step 22 .
STEP 10. Resistance measurement at C-32 stop light switch connector Disconnect C-32 stop light switch connector, and measure at the wiring harness side. Disconnect C-304 ETACS-ECU connector. Measure the resistance between the terminal No. 2 and the body ground. OK: No continuity Q: Is the check result normal? YES: Go to Step 11. NO: A short circuit may be present in the wiring harness between C-304 ETACS-ECU connector terminal No. 1 and C-32 stoplight switch connector terminal No. 2. Repair the wiring harness if necessary, and then replace fuse No. 2. Then go to Step 22 .
STEP 11. Resistance measurement at C-39 joint connector Disconnect C-39 joint connector, and measure at the wiring harness side. Disconnect F-06 rear combination light (stoplight: RH) connector, F-20 rear combination light (stoplight: LH) connector, F-10 high-mounted stoplight connector. Measure the resistance between the terminal No. 9 and the body ground. OK: No continuity Q: Is the check result normal? YES: Replace fuse No. 2. Then go to Step 22 . NO: A short circuit may be present in the wiring harness between C-39 joint connector terminal No. 9 and F-06 rear combination light (stoplight: RH) connector terminal No. 4 < LANCER >, No. 1 < LANCER SPORTBACK > or between C-39 joint connector terminal No. 9 and F-20 rear combination light (stoplight: LH) connector terminal No. 4 < LANCER >, No. 1 < LANCER SPORTBACK > or between C-39 joint connector terminal No. 9 and F-10 high-mounted stoplight connector terminal No. 1 < LANCER >, No. 2 < LANCER SPORTBACK >. Repair the wiring harness if necessary, and then replace fuse No. 2. Then go to Step 22 .
STEP 12. Connector check: C-304 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 13. NO: Repair the damaged connector. Then go to Step 22 .
STEP 13. Measure the voltage at the C-304 ETACS-ECU connector. CAUTION: Measure while the brake pedal is not depressed. Measure the voltage between terminal No. 1 and the body ground by backprobing. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 14. NO: Replace the ETACS-ECU (Refer to «ETACS-ECU»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ). Then go to Step 22 .
STEP 14. Connector check: C-32 Stoplight switch connector Q: Is the check result normal? YES: Go to Step 15. NO: Repair the damaged connector. Then go to Step 22 .
STEP 15. Measure the voltage at C-32 stoplight switch connector. Disconnect C-32 stoplight switch connector, and measure the voltage at harness connector side. Measure the voltage between the terminal No. 2 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 16. NO: An open circuit may be present in the wiring harness between C-304 ETACS-ECU connector terminal No. 1 and C-32 stoplight switch connector terminal No. 2. Repair the wiring harness. Then go to Step 22 .
STEP 16. Connector check: C-39 joint connector Q: Is the check result normal? YES: Go to Step 17. NO: Repair the damaged connector. Then go to Step 22 .
STEP 17. Voltage measurement at C-39 joint connector CAUTION: Measure while the brake pedal is depressed. Disconnect the connector, and measure at the wiring harness side. Measure the voltage between the terminal No. 9 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 18. NO: An open circuit may be present in the wiring harness between C-39 joint connector terminal No. 9 and C-32 stoplight switch connector terminal No. 1. Repair the wiring harness. Then go to Step 22 .
STEP 18. Connector check: C-312 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 19. NO: Repair the damaged connector. Then go to Step 22 .
STEP 19. Measure the voltage at the C-312 ETACS-ECU connector. Measure by backprobing without disconnecting the connector. Measure the voltage between the terminal No. 16 and the body ground. OK: When the brake pedal is released: 0 V - 5V (pulse) When the brake pedal is depressed: Approximately system voltage Q: Is the check result normal? YES: Go to Step 21 . NO: Go to Step 20.
STEP 20. Check the wiring harness between C-312 ETACS-ECU connector terminal No. 16 and C-32 stoplight switch connector terminal No. 1 Check the signal line for open circuit. Q: Is the check result normal? YES: Go to Step 23 . NO: Replace the wiring harness.
STEP 21. Diagnostic trouble code recheck Q: Is diagnostic trouble code No. C1000 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 22. NO: Intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)
STEP 22. Diagnostic trouble code recheck Erase the DTC. Q: Is diagnostic trouble code No. C1000 set? YES: Return to Step 1 . NO: This diagnosis is complete.
STEP 23. Diagnostic trouble code recheck Erase the DTC. Q: Is diagnostic trouble code No. C1000 set? YES: Replace the ETACS-ECU. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)

DTC C123B: Prolonged operation of ASC

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. Do not drop or shock the G and yaw rate sensor. When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU controls ASC by calculating the data sent from the wheel speed sensor, the steering wheel sensor, and the G and yaw rate sensor.

This DTC is set when ASC operates for a prolonged period.

Note. This DTC may be set when the vehicle runs on a slippery or rough road.

Steering wheel sensor malfunction
G and yaw rate sensor malfunction
Improper installation of steering wheel sensor, or G and yaw rate sensor
ASC-ECU malfunction
Different steering wheel
Wheel alignment not performed

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTIC TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after repairing the CAN bus line Q: Is DTC C123B set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Check the wheel speed sensor, and G and yaw rate sensor-related DTC. Check that DTCs No. C100A, C1015, C1020, C102B, C1011, C101C, C1027, C1032, C1014, C101F, C102A, C1035, C1041, C1042, C1043, C1044, C1219, C2205, C123C, and C2204 are also set. Q: Are DTCs C100A, C1015, C1020, C102B, C1011, C101C, C1027, C1032, C1014, C101F, C102A, C1035, C1041, C1042, C1043, C1044, C1219, C2205, C123C, and C2204 also set? YES: Carry out the diagnosis for the DTC that is set (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). Then go to Step 10 . NO: Go to Step 4.
STEP 4. Check of G and yaw rate sensor installation status Check that the G and yaw rate sensor is installed correctly. Q: Is the check result normal? YES: After checking the G and yaw rate sensor, perform the calibration of the G and yaw rate sensor to make ASC-ECU relearn the neutral point (Refer to «G AND YAW RATE SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__g-and-yaw-rate-sensor-calibration) ). Then go to Step 5. NO: Reinstall the G and yaw rate sensor correctly (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10 .
STEP 5. Using scan tool MB991958, check the service data Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 08: Lateral G sensor Item 09: G sensor Item 12: Yaw rate sensor Q: Is the check result normal? YES: Go to Step 6. NO: Replace the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10 .
STEP 6. Check of steering wheel sensor installation status Check that the steering wheel sensor is installed correctly. Q: Is the check result normal? YES: Go to Step 7. NO: Install the steering wheel sensor correctly (Refer to «STEERING WHEEL SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 7.
STEP 7. Wheel alignment check Refer to «ON-VEHICLES SERVICE/FRONT WHEEL ALIGNMENT CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/suspension-front/#front-suspension-wheel-alignment-except-lancer-evolution__front-wheel-alignment-check-and-adjustment) . Q: Is the check result normal? YES: After checking the wheel alignment, perform the calibration of steering wheel sensor to make ASC-ECU relearn the neutral point (Refer to «STEERING WHEEL SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 8. NO: After adjusting the wheel alignment, perform the calibration of steering wheel sensor to make ASC-ECU relearn the neutral point (Refer to «STEERING WHEEL SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 8.
STEP 8. Using scan tool MB991958, check the service data Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 11: Steering angle Q: Is the check result normal? YES: Go to Step 9. NO: Replace the steering wheel sensor (Refer to «STEERING WHEEL SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10 .
STEP 9. Check whether the DTC is reset. Q: Is DTC C123B set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10. NO: Intermittent malfunction. (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 10. Check whether the DTC is reset. Q: Is DTC C123B set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C2200 Abnormality in ASC-ECU

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU controls ASC by calculating the data sent from the wheel speed sensor, the steering wheel sensor, and the G and yaw rate sensor.

This DTC is set when ASC-ECU has malfunction.

Damaged wiring harness and connectors
ASC-ECU malfunction
Battery terminal malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C2200 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 3. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 3. DTC recheck after resetting CAN bus lines Q: Is DTC C2200 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C2101 Abnormality in battery voltage (high voltage)

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

The ASC-ECU is energized by the valve power supply circuit (terminal No. 32). When the power is supplied from the ignition switch (IG1) to the IG1 relay in ETACS-ECU, IG1 relay is turned on. At this time, the valve power supply circuit (terminal No. 4) energizes the ASC-ECU.

This DTC is set when the ASC-ECU power supply voltage is more than 18.0 ± 1.0 V.

Battery failure
ASC-ECU malfunction
Charging system failed

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C2101 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Battery check Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) . Q: Is the battery in good condition? YES: Go to Step 5 . NO: Charge or replace the battery. Then go to Step 4.
STEP 4. Charging system check Refer to «ON-VEHICLE SERVICE/GENERATOR OUTPUT LINE VOLTAGE DROP TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/charging-system/#charging-system-except-lancer-evolution) . Q: Is the check result normal? YES: Go to Step 5. NO: Repair or replace the charging system component(s).
STEP 5. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C2101 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 6. NO: The trouble can be an intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 6. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C2101 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C121C Torque request signal rejection

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. Do not drop or shock the G and yaw rate sensor. When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU sends the signal to the engine control module (ECM) as necessary to decrease the engine output for the ASC system operation.

This DTC is set when the request for the decrease of output is rejected by the engine control module (ECM).

Wrong coding of engine control module (ECM)
engine control module (ECM) malfunction
ASC-ECU malfunction
External noise interference

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C121C set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the other system DTC Use scan tool to check that the DTC is set in the engine control module (ECM). Q: Is the DTC set? YES: Troubleshoot the engine control module (ECM) (Refer to «DIAGNOSIS/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-non-turbo-except-lancer-evolution) < 2.0L engine non-turbo > or «DIAGNOSIS/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-turbo-except-lancer-evolution) < 2.0L engine turbo > or «DIAGNOSIS/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-24l-except-lancer-evolution) < 2.4L engine >), and then go to Step 7 . NO: Go to Step 4.
STEP 4. Using scan tool MB991958, check the DTC Check that DTC U1417 is set in ASC-ECU. Q: Is DTC U1417 set? YES: Troubleshoot for DTC U1417 (Refer to «DTC U1417 VARIANT CODING VALUE INVALID (INCLUDES FAULTY INSTALLATION)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-u1417-variant-coding-value-invalid) ). Then go to Step 5. NO: Replace the hydraulic unit (ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 7 .
STEP 5. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 68: Allow ESP torque request Q: Is the check result normal? YES: Go to Step 6. NO: Replace the engine control module (ECM) (Refer to «ENGINE CONTROL MODULE (ECM)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-non-turbo-except-lancer-evolution) < 2.0L engine non-turbo > or «ENGINE CONTROL MODULE (ECM)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-turbo-except-lancer-evolution) < 2.0L engine turbo > or «ENGINE CONTROL MODULE (ECM)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-24l-except-lancer-evolution) < 2.4L engine >), and then go to Step 7 .
STEP 6. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C121C set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 7. NO: If the trouble symptom is resolved, an intermittent malfunction such as poorly engaged connector(s) or wiring harness is suspected (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 7. Check whether the DTC is reset Erase the DTC. Q: Is DTC C121C set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1290 CAN time-out error

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). If the DTC C1290 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set. In this case, the set DTC is not highly reliable. Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ). When the DTC C1290 is set in ASC-ECU, the DTC for another system may also be set. When the DTC for another system is set, carry out diagnosis for that system first.

ASC-ECU receives signals necessary for the operations of ABS, ASC, and TCL from the engine control module (ECM), TCM or TC-SST-ECU, AWC-ECU, ETACS-ECU, and the steering wheel sensor via the CAN bus lines.

ASC-ECU receives signals necessary for the operations of ABS, ASC, and TCL from the engine control module (ECM), TCM or TC-SST-ECU, AWC-ECU, ETACS-ECU, and steering wheel sensor via CAN bus lines. This DTC is stored when ASC-ECU cannot receive the signals necessary for the operations of ABS, ASC, and TCL from the engine control module (ECM), TCM or TC-SST-ECU, AWC-ECU, ETACS-ECU, and steering wheel sensor.

Engine control module (ECM) malfunction
TCM or TC-SST-ECU malfunction
AWC-ECU malfunction
Steering wheel sensor malfunction
Malfunction of the CAN bus
ASC-ECU malfunction
Malfunction of ETACS-ECU
ETACS-ECUs have been interchanged between two vehicles.

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 6 .
STEP 2. Using scan tool MB991958, check the DTC Check that the DTCs U0100, U0101, U0126, and U0141 are set in ASC-ECU. Q: Is the DTC set? YES: Troubleshoot for the relevant DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). Then go to Step 6 . NO: Go to Step 3.
STEP 3. Using scan tool MB991958, other system check the DTC. Using scan tool, check if the DTCs are set from the engine control module (ECM), TCM or TC-SST-ECU, AWC-ECU, ETACS-ECU, and steering wheel sensor or not. Q: Is the DTC set? YES: Troubleshoot the relevant DTC, and then go to Step 6 . NO: Go to Step 4.
STEP 4. ETACS-ECU coding data check Refer to «PRECAUTIONS BEFORE SERVICE/CODING LIST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__coding-list) . Q: Is the check result normal? YES: Go to Step 5. NO: Replace the ETACS-ECU (Refer to «ETACS-ECU»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ), and then go to Step 6 .
STEP 5. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C1290 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 6. NO: If the trouble symptom is resolved, an intermittent malfunction such as poorly engaged connector(s) or wiring harness is suspected (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 6. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C1290 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C2203 VIN not recorded

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). When other DTC for ASC-ECU is set, troubleshoot that DTC first. Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU receives vehicle information from the engine control module (ECM) and stores it.

This DTC is set when ASC-ECU cannot receive the vehicle information from the engine control module (ECM).

Malfunction of the CAN bus
Engine control module (ECM) malfunction
ASC-ECU malfunction
When the ignition switch is turned to the "ON" position for the first time after the ASC-ECU is replaced.

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Ignition switch "LOCK" (OFF) Ignition switch "ON" Q: Is DTC C2203 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the engine control module (ECM) sets a DTC. Q: Is any DTC set? YES < 2.0L engine non-turbo >: Troubleshoot the engine control module (ECM) DTC (Refer to «DIAGNOSIS/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-non-turbo-except-lancer-evolution) ), and then go to Step 5 . YES < 2.0L engine-turbo >: Troubleshoot the engine control module (ECM) DTC (Refer to «DIAGNOSIS/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-turbo-except-lancer-evolution) ), and then go to Step 5 . YES < 2.4L engine >: Troubleshoot the engine control module (ECM) DTC (Refer to «DIAGNOSIS/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-24l-except-lancer-evolution) ), and then go to Step 5 . NO: Go to Step 4.
STEP 4. Check whether the DTC is reset. Erase the DTC Ignition switch "LOCK" (OFF) Ignition switch "ON" Q: Is DTC C2203 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 5. NO: If a trouble is solved, it is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 5. Check whether the DTC is reset. Erase the DTC Ignition switch "LOCK" (OFF) Ignition switch "ON" Q: Is DTC C2203 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C2206 Re-execution of variant coding

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Before replacing the ECU, ensure that the communication circuit is normal. When DTC C2206 is set in ASC-ECU, the DTC may also be set in ETACS-ECU. When the DTC is set in ETACS-ECU, carry out the diagnosis of the DTC for ETACS-ECU first. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.

ASC-ECU compares the last vehicle information received from ETACS-ECU with the previous vehicle information. If they do not match, ASC-ECU sets this DTC.

ETACS-ECUs have been interchanged between two vehicles.
Malfunction of ETACS-ECU
Malfunction of ASC-ECU
External noise interference

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Check if DTC U1415 or U1417 is also set. Q: Is DTC U1415 or U1417 set? YES: Perform troubleshooting for the diagnostic trouble code that is set (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
STEP 3. Using scan tool MB991958, diagnostic trouble code of other systems Use scan tool to check that the vehicles information-related DTC is set by the ETACS-ECU. Q: Is any DTC set? YES: Troubleshoot the relevant diagnostic trouble code, and then go to Step 7 . NO: Go to Step 4.
STEP 4. ETACS-ECU coding data check Refer to «PRECAUTIONS BEFORE SERVICE/CODING LIST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__coding-list) . Q: Is the check result normal? YES: Go to Step 6 . NO: Go to Step 5.
STEP 5. ETACS-ECU variant coding Perform the variant coding to the ETACS-ECU. Q: Does variant coding succeed? YES: Go to Step 7 . NO: Replace the ETACS-ECU (Refer to «ETACS-ECU»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ), and then go to Step 7 .
STEP 6. Check whether the diagnostic trouble code is reset. Erase the DTC. Q: Is DTC C2206 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 7. NO: The procedure is complete.
STEP 7. Check whether the diagnostic trouble code is reset. Erase the DTC. Q: Is DTC C2206 set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 33

Scheme 33: DTC C1210 Abnormality in G and yaw rate sensor (Abnormality in longitudinal G sensor output voltage)

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. Do not drop or shock the G and yaw rate sensor. When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ABS-ECU monitors if the output of G and yaw rate sensor is normal or not.

This DTC is set if any malfunction below is found

When the output value of the longitudinal G-sensor is abnormal
When abnormality is detected by the self-diagnosis of the longitudinal G-sensor

Wiring harness or connector failure for the special CAN bus lines between ASC-ECU and the G and yaw rate sensor
G and yaw rate sensor malfunction
ASC-ECU malfunction
External noise interference

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1210 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 09: G sensor Q: Is the check result normal? YES: Go to Step 6 . NO: Go to Step 4.
STEP 4. Connector check: A-51 ASC-ECU connector, C-137 G and yaw rate sensor connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the connector, and then go to Step 8 .
STEP 5. Wiring harness check between A-51 ASC-ECU connector terminal No. 18 and C-137 G and yaw rate sensor connector terminal No. 3 as well as between A-51 ASC-ECU connector terminal No. 19 and C-137 G and yaw rate sensor connector terminal No. 2 Check the communication circuit for open and short circuit. Q: Is the check result normal? YES: Replace the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ) and then go to Step 7 . NO: Repair the wiring harness, and then go to Step 8 .
STEP 6. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C1210 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8 . NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 7. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C1210 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8. NO: The procedure is complete.
STEP 8. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C1210 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1242 Abnormality in G and yaw rate sensor (Abnormality in longitudinal G sensor output signal)

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. Do not drop or shock the G and yaw rate sensor. When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ABS-ECU monitors if the output of G and yaw rate sensor is normal or not.

This DTC is set when the abnormality is detected by comparing the longitudinal G-sensor value output from the G and yaw rate sensor with the value output from the wheel speed sensor.

Wiring harness or connector failure for the special CAN bus lines between ASC-ECU and the G and yaw rate sensor
Improper installation of the G and yaw rate sensor
G and yaw rate sensor malfunction
Malfunction of wheel speed sensor
ASC-ECU malfunction
External noise interference NOTE: When rotated on the four-wheel drum tester, this DTC may be set.

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. Using scan tool MB991958, check the DTC Check that the DTC U0125 is set in ASC-ECU. Q: Is DTC U0125 set? YES: Troubleshoot for the DTC (Refer to «DTC U0125 G AND YAW RATE SENSOR MESSAGE TIME-OUT ERROR/MESSAGE ERROR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-u0125-g-and-yaw-rate) ). Then go to Step 3. NO: Go to Step 3.
STEP 3. DTC recheck after resetting CAN bus lines Q: Is DTC C1242 set? YES: Go to Step 4. NO: The procedure is complete.
STEP 4. Check the wheel speed sensor-related DTC. Use the scan tool to check whether the wheel speed sensor-related DTC is set or not. Q: Is the DTC set? YES: Troubleshoot for the relevant DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 5.
STEP 5. Using scan tool MB991958, check the data list Check the following data list under curb weight condition or one occupant (driver) only in the vehicle, on a flat road (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 09: G sensor Item 96: G sensor offset Q: Is the check result normal? YES: Turn the ignition switch to the "ON" from "OFF" position. Then go to Step 9 . NO: Go to Step 6.
STEP 6. G and yaw rate sensor check Check that the G and yaw rate sensor is installed correctly. Q: Is the check result normal? YES: Go to Step 7. NO: Reinstall the G and yaw rate sensor correctly (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 10 .
STEP 7. Connector check: A-51 ASC-ECU connector, C-137 G and yaw rate sensor connector Q: Is the check result normal? YES: Go to Step 8. NO: Repair the connector, and then go to Step 10 .
STEP 8. Wiring harness check between A-51 ASC-ECU connector terminal No. 18 and C-137 G and yaw rate sensor connector terminal No. 3 as well as between A-51 ASC-ECU connector terminal No. 19 and C-137 G and yaw rate sensor connector terminal No. 2 Check the communication circuit for open and short circuit. Q: Is the check result normal? YES: Replace the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9. NO: Repair the wiring harness, and then go to Step 10 .
STEP 9. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C1242 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 10. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 10. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C1242 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C123C Abnormality in G and yaw rate sensor [Abnormality in lateral G sensor and yaw rate output value (incorrect installation)]

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. Do not drop or shock the G and yaw rate sensor. When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ABS-ECU monitors if the output of G and yaw rate sensor is normal or not.

This DTC is set if any malfunction below is found

The output value of lateral G and yaw rate is abnormal.
When abnormality is detected by comparing the value output of the lateral G and yaw rate with the one from the steering wheel sensor and wheel speed sensor

Wiring harness or connector failure for the special CAN bus lines between ASC-ECU and the G and yaw rate sensor
Improper installation of the G and yaw rate sensor
G and yaw rate sensor malfunction
Steering wheel sensor malfunction
Improperly installed steering wheel sensor
Malfunction of wheel speed sensor
ASC-ECU malfunction
External noise interference

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. Using scan tool MB991958, check the DTC Check that the DTC U0125 is set in ASC-ECU. Q: Is DTC U0125 set? YES: Troubleshoot for the DTC (Refer to «DTC U0125 G AND YAW RATE SENSOR MESSAGE TIME-OUT ERROR/MESSAGE ERROR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-u0125-g-and-yaw-rate) ). Then go to Step 3. NO: Go to Step 3.
STEP 3. DTC recheck after resetting CAN bus lines Q: Is DTC C123C set? YES: Go to Step 4. NO: The procedure is complete.
STEP 4. Check the wheel speed sensor-related DTC. Use scan tool to check whether the wheel speed sensor- related or steering wheel sensor-related DTC is set or not. Q: Is the DTC set? YES: Troubleshoot for the relevant DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 5.
STEP 5. G and yaw rate sensor installation check Check that the G and yaw rate sensor is installed correctly. Q: Is the check result normal? YES: After checking the G and yaw rate sensor, carry out calibration of the G and yaw rate sensor to make ASC-ECU relearn the neutral point (Refer to «G AND YAW RATE SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__g-and-yaw-rate-sensor-calibration) ). Then go to Step 6. NO: Reinstall the G and yaw rate sensor correctly (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 12 .
STEP 6. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 08: Lateral G-sensor Item 12: Yaw rate sensor Q: Is the check result normal? YES: Go to Step 9 . NO: Go to Step 7.
STEP 7. Connector check: A-51 ASC-ECU connector, C-137 G and yaw rate sensor connector Q: Is the check result normal? YES: Go to Step 8. NO: Repair the connector, and then go to Step 13 .
STEP 8. Wiring harness check between A-51 ASC-ECU connector terminal No. 18 and C-137 G and yaw rate sensor connector terminal No. 3 as well as between A-51 ASC-ECU connector terminal No. 19 and C-137 G and yaw rate sensor connector terminal No. 2 Check the communication circuit for open and short circuit. Q: Is the check result normal? YES: Replace the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 12 . NO: Repair the wiring harness, and then go to Step 13 .
STEP 9. Steering wheel sensor installation check Check that the steering wheel sensor is installed correctly. Q: Is the check result normal? YES: Go to Step 10. NO: Reinstall the steering wheel sensor correctly (Refer to «STEERING WHEEL SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 10.
STEP 10. Wheel alignment check Refer to «ON-VEHICLES SERVICE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/suspension-front/#front-suspension-wheel-alignment-except-lancer-evolution) . Q: Is the check result normal? YES: After checking the wheel alignment, carry out calibration of steering wheel sensor to make ASC-ECU relearn the neutral point (Refer to «STEERING WHEEL SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11. NO: After adjusting the wheel alignment, carry out calibration of steering wheel sensor to make ASC-ECU relearn the neutral point (Refer to «STEERING WHEEL SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 11.
STEP 11. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 11: Steering angle Q: Is the check result normal? YES: Go to Step 12. NO: Replace the steering wheel sensor (Refer to «STEERING WHEEL SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 12.
STEP 12. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C123C set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 13. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 13. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C123C set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C2204 Internal abnormality in G and yaw rate sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. Do not drop or shock the G and yaw rate sensor. When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ABS-ECU monitors if the output of G and yaw rate sensor is normal or not.

This DTC is set if any malfunction below is found

When abnormality is detected by the self-diagnosis of the lateral G and yaw rate
When the output value of the lateral G and yaw rate is not within the standard value range NOTE: This DTC may be set when G and yaw rate sensor is put on the turntable turning at high speed.

Wiring harness or connector failure for the special CAN bus lines between ASC-ECU and the G and yaw rate sensor
Improper installation of the G and yaw rate sensor
Damaged wiring harness and connectors
G and yaw rate sensor malfunction
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. Using scan tool MB991958, check the DTC Check that the DTC U0125 is set in ASC-ECU. Q: Is DTC U0125 set? YES: Troubleshoot for the DTC (Refer to «DTC U0125 G AND YAW RATE SENSOR MESSAGE TIME-OUT ERROR/MESSAGE ERROR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-u0125-g-and-yaw-rate) ). Then go to Step 3. NO: Go to Step 3.
STEP 3. DTC recheck after resetting CAN bus lines Q: Is DTC C2204 set? YES: Go to Step 4. NO: The procedure is complete.
STEP 4. Using scan tool MB991958, check the data list Check the following data list under curb weight condition or one occupant (driver) only in the vehicle, on a flat road (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 08: Lateral G-sensor Item 09: G-sensor Item 12: Yaw rate sensor Item 73: Lateral G sensor offset Item 97: Yaw rate sensor offset Q: Is the check result normal? YES: Turn the ignition switch to the "ON" from "OFF" position. Then go to Step 8 . NO: Go to Step 5.
STEP 5. G and yaw rate sensor installation check Check that the G and yaw rate sensor is installed correctly. Q: Is the check result normal? YES: Go to Step 6. NO: Reinstall the G and yaw rate sensor correctly (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 9 .
STEP 6. Connector check: A-51 ASC-ECU connector, C-137 G and yaw rate sensor connector Q: Is the check result normal? YES: Go to Step 7. NO: Repair the connector, and then go to Step 9 .
STEP 7. Wiring harness check between A-51 ASC-ECU connector terminal No. 18 and C-137 G and yaw rate sensor connector terminal No. 3 as well as between A-51 ASC-ECU connector terminal No. 19 and C-137 G and yaw rate sensor connector terminal No. 2 Check the communication circuit for open and short circuit. Q: Is the check result normal? YES: Replace the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8. NO: Repair the wiring harness, and then go to Step 9 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C2204 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 9. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C2204 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C2111 Brake Fluid Pressure Sensor Power Supply Circuit (Low input); DTC C2112 Brake Fluid Pressure Sensor Power Supply Circuit (High input)

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

When the brake pedal is depressed, the brake fluid pressure sensor integrated in the hydraulic unit detects the brake fluid pressure applied from the master cylinder, converts the pressure value into voltage signal, and outputs it.

This DTC is set when the voltage applied to the pressure sensor is not within the standard value range.

ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is the DTC C2111 or C2112 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Battery check Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) . Q: Is the battery in good condition? YES: Go to Step 4. NO: Charge or replace the battery, and then go to Step 6 .
STEP 4. Charging system check Refer to «ON-VEHICLE SERVICE/GENERATOR OUTPUT LINE VOLTAGE DROP TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/charging-system/#charging-system-except-lancer-evolution) . Q: Is the charging system in good condition? YES: Go to Step 5. NO: Repair or replace the charging system component(s), and then go to Step 6 .
STEP 5. Check whether the DTC is reset. Erase the DTC. Q: Is the DTC C2111 or C2112 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 6. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 6. Check whether the DTC is reset. Erase the DTC. Q: Is the DTC C2111 or C2112 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C2114 Abnormality in G and yaw rate sensor operation voltage (Low voltage); DTC C2115 Abnormality in G and yaw rate sensor operation voltage (High voltage)

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. Do not drop or shock the G and yaw rate sensor. When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU supplies power to the G and yaw rate sensor at the terminal No. 1.
The G and yaw rate sensor outputs the signal to ASC-ECU via the special CAN bus lines.

This DTC is set if any malfunction below is found

DTC C2114

When the power supply voltage applied from ASC-ECU to the G and yaw rate sensor is not within the standard value range < low voltage (6.5 ± 0.5 V or less) >

DTC C2115

When the power supply voltage applied from ASC-ECU to the G and yaw rate sensor is not within the standard value range < high voltage (18.0 ± 1.0 V or more) >

Wiring harness or connector failure for the special CAN bus lines between ASC-ECU and the G and yaw rate sensor
Damaged wiring harness and connectors
G and yaw rate sensor malfunction
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 34

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. Using scan tool MB991958, check the DTC. Check that the DTC U0125 is set in ASC-ECU. Q: Is DTC U0125 set? YES: Troubleshoot for the DTC (Refer to «DTC U0125 G AND YAW RATE SENSOR MESSAGE TIME-OUT ERROR/MESSAGE ERROR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__dtc-u0125-g-and-yaw-rate) ). Then go to Step 3. NO: Go to Step 3.
STEP 3. DTC recheck Drive the vehicle at 12 mph (20 km/h) or more. Q: Is DTC C2114 or C2115 set? YES: Go to Step 4. NO: The procedure is complete.
STEP 4. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 08: Lateral G sensor Item 09: G sensor Item 12: Yaw rate sensor Q: Is the check result normal? YES: Go to Step 12 . NO: Go to Step 5.
STEP 5. Connector check: A-51 ASC-ECU connector, C-137 G and yaw rate sensor connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair the connector, and then go to Step 13 .
STEP 6. Wiring harness check between A-51 ASC-ECU connector terminal No. 18 and C-137 G and yaw rate sensor connector terminal No. 3 as well as between A-51 ASC-ECU connector terminal No. 19 and C-137 G and yaw rate sensor connector terminal No. 2 Check the communication circuit for open and short circuit. Q: Is the check result normal? YES: Go to Step 7. NO: Repair the wiring harness, and then go to Step 13 .
STEP 7. G and yaw rate sensor installation check Check that the G and yaw rate sensor is installed correctly. Q: Is the check result normal? YES: Go to Step 8. NO: Reinstall the G and yaw rate sensor correctly (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 13 .
STEP 8. Voltage measurement at C-137 G and yaw rate sensor connector Disconnect the C-137 G and yaw rate sensor connector. Turn the ignition switch to the "ON" position. Measure the voltage at the harness side between the terminal No. 1 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 11 . NO: Go to Step 9.
STEP 9. Voltage measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect the ASC check harness (Special tool: MB991997) to the ASC-ECU-side connector and harness-side connector, and then measure at the special tool connector side. Disconnect the C-137 G and yaw rate sensor connector. Turn the ignition switch to the "ON" position. Measure the voltage between the terminal No. 22 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 12 . NO: Go to Step 10.
STEP 10. Wiring harness check between A-51 ASC-ECU connector terminal No. 22 and C-137 G and yaw rate sensor connector terminal No. 1. Check the power supply circuit for open and short circuit. Q: Is the check result normal? YES: Go to Step 12 . NO: Repair the wiring harness between A-51 ASC-ECU connector terminal No. 22 and C-137 G and yaw rate sensor connector terminal No. 1.
STEP 11. Wiring harness check between A-51 ASC-ECU connector terminal No. 29 and C-137 G and yaw rate sensor connector terminal No. 4. Check the ground circuit for open circuit. Q: Is the check result normal? YES: Replace the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ) and then go to Step 12. NO: Repair the wiring harness between A-51 ASC-ECU connector terminal No. 29 and C-137 G and yaw rate sensor connector terminal No. 4.
STEP 12. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or more. Q: Is DTC C2114 or C2115 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 13. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 13. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or more. Q: Is DTC C2114 or C2115 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C123A: Abnormality in sensor calibration

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. Do not drop or shock the G and yaw rate sensor. When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to STEERING WHEEL SENSOR CALIBRATION ). When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU stores the calibrated value of the G and yaw rate sensor, steering wheel sensor, and brake fluid pressure sensor.

This DTC is set when the calibrated value for each sensor stored in ASC-ECU is not within the predetermined range.

Abnormality in neutral position of the G and yaw rate sensor
Abnormality in neutral position of the steering wheel sensor
Abnormality in neutral position of the brake fluid pressure sensor

Improper installation of G and yaw rate sensor or steering wheel sensor
ASC-ECU malfunction
External noise interference

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTIC TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C123A set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Check other DTC is set. Check if the DTC related to the G and yaw rate sensor and the steering wheel sensor is set. Q: Is any DTC set? YES: Perform the diagnosis for the relevant DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 4.
STEP 4. G and yaw rate sensor calibration Perform the calibration of G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__g-and-yaw-rate-sensor-calibration) ). Q: Has the calibration succeeded? YES: Go to Step 5. NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8 .
STEP 5. Steering wheel sensor calibration Perform the calibration of steering wheel sensor (Refer to «STEERING WHEEL SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Q: Has the calibration succeeded? YES: Go to Step 6. NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8 .
STEP 6. Brake fluid pressure sensor calibration Perform the calibration of brake fluid pressure sensor (Refer to «BRAKE FLUID PRESSURE SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__brake-fluid-pressure-sensor-calibration) ). Q: Has the calibration succeeded? YES: Go to Step 7. NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8 .
STEP 7. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C123A set? NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 8. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C123A set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1219 Abnormality in steering wheel sensor signal

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to STEERING WHEEL SENSOR CALIBRATION ). Do not drop or shock the G and yaw rate sensor. When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Steering wheel sensor outputs the signal to ASC-ECU via the CAN bus lines.

This DTC is set if any malfunction below is found

The tolerance of neutral position of steering wheel sensor exceeds the specified range.
Abnormality in steering wheel sensor output value
When abnormality is detected by comparing the value output from the steering wheel sensor with the one from the wheel speed sensor and the G and yaw rate sensor.

Improper installation of steering wheel sensor
Wheel alignment not performed
Steering wheel sensor malfunction
Different steering wheel
G and yaw rate sensor malfunction
Malfunction of wheel speed sensor
ASC-ECU malfunction
External noise interference
Wrong steering wheel is attached

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C1219 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC Check that the wheel speed sensor-related, G and yaw rate sensor-related, or steering wheel sensor-related DTC is set. Q: Is the DTC set? YES: Troubleshoot the relevant DTC, and then go to Step 8 . NO: Go to Step 4.
STEP 4. Check how steering wheel sensor is installed. Check that the steering wheel sensor is installed correctly (Refer to «STEERING WHEEL SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 5. NO: Install the steering wheel sensor correctly (Refer to «STEERING WHEEL SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 5.
STEP 5. Wheel alignment check Q: Is the check result normal? YES: After the wheel alignment check, perform the steering wheel sensor calibration to make ASC-ECU learn the neutral point again (Refer to «STEERING WHEEL SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 6. NO: After the adjustment of the wheel alignment, perform the steering wheel sensor calibration to make ASC-ECU learn the neutral position again (Refer to «STEERING WHEEL SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 6.
STEP 6. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 11: Steering angle Q: Is the check result normal? YES: Go to Step 7. NO: After the steering wheel sensor is replaced, perform the steering wheel sensor calibration to make ASC-ECU learn the neutral point again (Refer to «STEERING WHEEL SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 8 .
STEP 7. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ASC indicator and ASC OFF indicator do not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1219 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8. NO: The procedure is complete.
STEP 8. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12 mph (20 km/h) or higher. NOTE: The ASC indicator and ASC OFF indicator do not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher. Q: Is DTC C1219 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C121A Abnormality in steering wheel sensor calibration

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to STEERING WHEEL SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Steering wheel sensor stores the neutral position learned by scan tool. When the neutral position has not been stored in the steering wheel sensor yet, the steering wheel sensor outputs the signal indicating that it does not have neutral position.

This DTC is set when ASC-ECU detects that the steering wheel sensor has not learned the neutral position yet.

Neutral position of steering wheel sensor not learned
Steering wheel sensor malfunction
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C121A set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Steering wheel sensor calibration Perform calibration of steering wheel sensor (Refer to «STEERING WHEEL SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Q: Has the calibration succeeded? YES: Go to Step 4. NO: After the steering wheel sensor is replaced, perform the steering wheel sensor calibration to make ASC-ECU learn the neutral point again (Refer to «STEERING WHEEL SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 4.
STEP 4. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C121A set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 5. NO: The procedure is complete.
STEP 5. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C121A set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C2205: Internal malfunction of steering wheel sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to STEERING WHEEL SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Steering wheel sensor sends its status signal to ASC-ECU.

This DTC is set when ASC-ECU detects that the steering wheel sensor has malfunction.

Steering wheel sensor malfunction
ASC-ECU malfunction
External noise interference

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 4 .
STEP 2. Check whether the DTC is reset. Q: Is DTC C2205 set? YES: Replace the steering wheel sensor (Refer to «STEERING WHEEL SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 3. NO: The procedure is complete.
STEP 3. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C2205 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 4. NO: The procedure is complete.
STEP 4. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C2205 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C1395 Brake fluid filling not completed

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

This DTC is set when the brake fluid is not filled in the hydraulic unit.

Different hydraulic unit (For delivery to factory)
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C1395 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO: The procedure is complete.

Scheme 35

Scheme 35: DTC C1608 Implausible diagnosis data

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

The ASC-ECU stores diagnostic trouble codes and failure information in the EEPROM*.

ASC-ECU (EEPROM*)contains the power supply circuit (terminal No. 2).

Note. *:EEPROM (Electrical Erasable and Programmable ROM)

This DTC is set when the failure information stored in the EEPROM is not reliable. The failure information stored in the past is not output, and only this DTC is set.
This DTC may occur when ASC-ECU power supply shutdown or drop between ASC-ECU is writing a data to the EEPROM.

Disconnection of the ASC-ECU connector or the battery terminal when the ignition switch is ON
Loose battery terminal
Abnormality in battery
Damaged wiring harness and connectors
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

Scheme 36

Scheme 37

STEP 1. Using scan tool MB991958, diagnose the CAN bus line. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution) ). On completion, and then go to Step 2.
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines Q: Is DTC C1608 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Battery check Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) . Q: Is the battery in good condition? YES: Go to Step 5 . NO: Go to Step 4.
STEP 4. Charging system check Refer to «ON-VEHICLE SERVICE/GENERATOR OUTPUT LINE VOLTAGE DROP TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/charging-system/#charging-system-except-lancer-evolution) . Q: Is the charging system in good condition? YES: Replace the battery. Then go to Step 11 . NO: Repair or replace the charging system component(s).
STEP 5. Voltage measurement at the A-51 ASC-ECU connector Disconnect the connector, connect special tool MB991997 to the harness-side connector, and measure the voltage at the special tool connector side. NOTE: Do not connect the special tool MB991997 to ASC-ECU. Measure the voltage between the terminal No. 2 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 7 . NO: Go to Step 6.
STEP 6. Connector check: A-51 ASC-ECU connector Q: Is the check result normal? YES: The open or short circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 02 and fuse No. 17. NO: Repair the defective connector.
STEP 7. Resistance measurement at A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Resistance between the terminal No. 16 and the body ground, and between the terminal No. 47 and the body ground OK: Continuity exists (2 ohms or less) Q: Is the check result normal? YES: Go to Step 9 . NO: Go to Step 8.
STEP 8. Connector check: A-51 ASC-ECU connector Q: Is the check result normal? YES: An open circuit may be present in the ground circuit. Repair the wiring harness between the A-51 ASC-ECU terminal No. 16 and body ground, and between the A-51 ASC-ECU terminal No. 47 and body ground. NO: Repair the defective connector.
STEP 9. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1608 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10. NO: Go to Step 11 .
STEP 10. Check whether the DTC is reset. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is DTC C1608 set? YES: Return to Step 1 . NO: Go to Step 11.
STEP 11. Check the other DTCs. Erase the DTC. Drive the vehicle at 12mph (20 km/h) or higher. NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher. Q: Is any DTC set? YES: Carry out the applicable troubleshooting for the DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: The procedure is complete.

DTC C2002: Valve calibration not completed

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Perform the master cylinder pressure sensor calibration to store the calibrated value in the ASC-ECU. At the same time, the calibrated value of cut valve and inlet valve are stored.

This DTC is set when the calibrated values for cut valve and inlet valve stored in ASC-ECU are not within the predetermined range.

ASC-ECU malfunction
Noise interference

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C2002 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 3. NO: The procedure is complete.
STEP 3. Check whether the DTC is reset. Erase the DTC. Q: Is DTC C2002 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC C2003: Control parameter not implement

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines. If DTC C2003 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set. In this case, the set DTC is not highly reliable. Before replacing the ECU, ensure that the communication circuit is normal. When DTC C2003 is set in ASC-ECU, the DTC may also be set in ETACS-ECU. When the DTC is set in ETACS-ECU, carry out the diagnosis of the DTC for ETACS-ECU first. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.

When received unset coding data from the ETACS-ECU, this DTC is set.

Malfunction of ETACS-ECU
Engine ECU malfunction
ETACS-ECUs have been interchanged between two vehicles.
ASC-ECU malfunction
ASC-ECUs have been interchanged between two vehicles.
ETACS-ECU or ASC-ECU installation error
Malfunction of ETACS-ECU coding data

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC C2003 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the other system DTC Use scan tool to check whether any coding-related diagnostic trouble code is set by ETACS-ECU. Q: Is the DTC set? YES: Troubleshoot for the relevant diagnostic trouble code (Refer to «ETACS-ECU/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution__diagnostic-trouble-code-chart) ). Then go to Step 8 . NO: Go to Step 4.
STEP 4. Check part number of ASC-ECU Check the part number of ASC-ECU. Q: Is the check result normal? YES: Go to Step 5. NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 8 .
STEP 5. ETACS-ECU coding data check Refer to «PRECAUTIONS BEFORE SERVICE/CODING LIST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__coding-list) . Q: Is the check result normal? YES: Go to Step 6. NO: Replace the ETACS-ECU (Refer to «ETACS-ECU»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ).
STEP 6. Check part number of ETACS-ECU Check the part number of ETACS-ECU. Q: Is the check result normal? YES: Go to Step 7. NO: Replace the ETACS-ECU (Refer to «ETACS-ECU»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ).
STEP 7. Check whether the DTC is reset. Q: Is DTC C2003 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 8. NO: The trouble can be an intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 8. Check whether the DTC is reset. Q: Is DTC C2003 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC U0001 Bus-off

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). If DTC U0001 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set. In this case, the set DTC is not highly reliable. Before replacing the ECU, ensure that the communication circuit is normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

This DTC is set when ASC-ECU has ceased the CAN communication (bus off).

COMMENTS ON TROUBLE SYMPTOM

Malfunction of wiring harness, connector (s), or ASC-ECU may be present.

Wiring harness or connector failure of CAN bus line
ASC-ECU malfunction
Other ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 3 .
STEP 2. Check whether the DTC is reset. Erase the DTC. Q: Is DTC U0001 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 3. NO: If the trouble symptom is resolved, an intermittent malfunction such as poorly engaged connector(s) or wiring harness is suspected (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 3. Check whether the DTC is reset. Erase the DTC. Q: Is DTC U0001 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC U0100 Engine time-out error; DTC U0101 CVT or TC-SST time-out error; DTC U0126 Steering wheel sensor time-out error; DTC U0141 ETACS time-out error; DTC U0114 AWC time-out error

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). If DTCs U0100, U0101, U0126, U0141, and U0114 are set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set. In this case, the set DTC is not highly reliable. Before replacing the ECU, ensure that the communication circuit is normal. When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to STEERING WHEEL SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

This DTC is set if ASC-ECU cannot receive the signal sent from other ECU for a certain period.

ASC-ECU communicates with the engine control module (ECM), TCM or TC-SST-ECU the steering wheel sensor, ETACS-ECU and AWC-ECU via the CAN bus lines.

DTC U0100

Wiring harness or connector failure of CAN bus line
Engine control module (ECM) malfunction
ASC-ECU malfunction

DTC U0101

Wiring harness or connector failure of CAN bus line
TCM or TC-SST-ECU malfunction
ASC-ECU malfunction

DTC U0126

Wiring harness or connector failure of CAN bus line
Steering wheel sensor malfunction
ASC-ECU malfunction

DTC U0141

Wiring harness or connector failure of CAN bus line
Malfunction of ETACS-ECU
ASC-ECU malfunction

DTC U0114

Wiring harness or connector failure of CAN bus line
Malfunction of AWC-ECU
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 4 .
STEP 2. Check whether the DTC is reset. Q: Is DTC U0100, U0101, U0126, U0141 or U0114 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check read the DTC other system. Use scan tool to check that other DTC is set in the ECU corresponding to the relevant diagnosis. Q: Is other DTC set? YES: Troubleshoot for the relevant DTC. NO: Go to Step 4.
STEP 4. Using scan tool MB991958, check read the DTC other system. Use scan tool to check if the same DTC (time-out) is set in the other ECU (CAN-C). Q: Is any DTC set? YES (DTC U0100 is set): Replace the engine control module (ECM), and then go to Step 5. YES (DTC U0101 is set): Replace the TCM or TC-SST-ECU, and then go to Step 5. YES (DTC U0126 is set): Replace steering wheel sensor, and then go to Step 5. YES (DTC U0141 is set): Replace the ETACS-ECU, and then go to Step 5. YES (DTC U0114 is set): Replace the AWC-ECU, and then go to Step 5. NO (No DTC is set.): The procedure is complete.
STEP 5. Check whether the DTC is reset. Erase the DTC. Q: Is DTC U0100, U0101, U0126, U0141 or U0114 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO: The procedure is complete.

DTC U0125 G and yaw rate sensor message time-out error/message error

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. Do not drop or shock the G and yaw rate sensor. When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

The G and yaw rate sensor outputs the signal to ASC-ECU via the special CAN bus lines.

This DTC is set when the ASC-ECU cannot receive the signal from the G and yaw rate sensor although there is no abnormality in ASC-ECU supply voltage.

Note. When an abnormality is present in the ASC-ECU supply voltage, DTC C2100 (low voltage error) is set, and DTC U0125 is not set.

Wiring harness or connector failure for the special CAN bus lines between ASC-ECU and the G and yaw rate sensor
G and yaw rate sensor malfunction
ASC-ECU malfunction
External noise interference

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC U0125 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Connector check: A-51 ASC-ECU connector, C-137 G and yaw rate sensor connector Q: Is the check result normal? YES: Go to Step 4. NO: Repair the connector, and then go to Step 7 .
STEP 4. Wiring harness check between A-51 ASC-ECU connector terminal No. 18 and C-137 G and yaw rate sensor connector terminal No. 3 as well as between A-51 ASC-ECU connector terminal No. 19 and C-137 G and yaw rate sensor connector terminal No. 2 Check the communication circuit for open and short circuit. Q: Is the check result normal? YES: Go to Step 5. NO: Repair the wiring harness, and then go to Step 7 .
STEP 5. DTC recheck Erase the DTC. Q: Is DTC U0125 set? YES: Replace the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 6. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 6. DTC recheck Erase the DTC. Q: Is DTC U0125 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 7. NO: The procedure is complete.
STEP 7. DTC recheck Erase the DTC. Q: Is DTC U0125 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC U0401 Engine signal malfunction detected

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). If DTC U0401 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set. In this case, the set DTC is not highly reliable. Before replacing the ECU, ensure that the communication circuit is normal.

Engine-related signals are sent or received to and from between ASC-ECU and engine control module (ECM) via CAN bus lines.

This DTC is set when the engine control module (ECM) malfunction has been detected.

Malfunction of engine system
Malfunction of engine control module (ECM)
Malfunction of ASC-ECU
External noise interference

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 5 .
STEP 2. Using scan tool MB991958, check the DTC Use scan tool to check that any DTC other than the DTC U0401 is set in ASC-ECU. Q: Is the DTC set? YES: Troubleshoot the relevant DTC, and then go to Step 5 . NO: Go to Step 3.
STEP 3. Using scan tool MB991958, check the other system DTC Use scan tool to check that the DTC is set by the engine control module (ECM). Q: Is the DTC set? YES: Troubleshoot the relevant DTC, and then go to Step 5 . NO: Go to Step 4.
STEP 4. Check whether the DTC is reset. Erase the DTC. Q: Is DTC U0401 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 5. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 5. Check whether the DTC is reset. Erase the DTC. Q: Is DTC U0401 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC U0428 Communication error in steering wheel sensor

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). If DTC U0428 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set. In this case, the set DTC is not highly reliable. Before replacing the ECU, ensure that the communication circuit is normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

The steering wheel sensor outputs the steering wheel status to ASC-ECU via the CAN bus lines.

This DTC is set when ASC-ECU has detected the communication error in the steering wheel sensor.

Steering wheel sensor malfunction
ASC-ECU malfunction
External noise interference

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Replace the steering wheel sensor (Refer to «STEERING WHEEL SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 3 .
STEP 2. Check whether the DTC is reset. Erase the DTC. Q: Is DTC U0428 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO: The procedure is complete.
STEP 3. Check whether the DTC is reset. Erase the DTC. Q: Is DTC U0428 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC U1003 G and yaw rate sensor bus-off

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. Do not drop or shock the G and yaw rate sensor. When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to G AND YAW RATE SENSOR CALIBRATION ). When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

The G and yaw rate sensor outputs the signal to ASC-ECU via the special CAN bus lines.

This DTC is set when the communication error occurs in the exclusive CAN bus communication between the ASC-ECU and the G and yaw rate sensor.

Wiring harness or connector failure for the special CAN bus lines between ASC-ECU and the G and yaw rate sensor
Malfunction of the G and yaw rate sensor
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines. (Refer to «CAN BUS DIAGNOSTIC TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) .) On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC U1003 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Connector check: A-51 ASC-ECU connector, C-137 G and yaw rate sensor connector Q: Is the check result normal? YES: Go to Step 4. NO: Repair the connector, and then go to Step 7 .
STEP 4. Wiring harness check between A-51 ASC-ECU connector terminal No. 18 and C-137 G and yaw rate sensor connector terminal No. 3 as well as between A-51 ASC-ECU connector terminal No. 19 and C-137 G and yaw rate sensor connector terminal No. 2 Check the communication circuit for open and short circuit. Q: Is the check result normal? YES: Go to Step 5. NO: Repair the wiring harness, and then go to Step 7 .
STEP 5. DTC recheck Erase the DTC. Q: Is DTC U1003 set? YES: Replace the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 6. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 6. DTC recheck Erase the DTC. Q: Is DTC U1003 set? YES: Replace the hydraulic unit (integrated with ASC-ECU). (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) .) Then go to Step 7. NO: The procedure is complete.
STEP 7. DTC recheck Erase the DTC. Q: Is DTC U1003 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC U1415 Variant coding not implemented

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the DTC U1415 is set in ASC-ECU, the DTC may also be set in ETACS-ECU. When the DTC is set in ETACS-ECU, carry out the diagnosis of the DTC for ETACS-ECU first. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.

This DTC is set when the variant coding for ETACS-ECU has not been implemented.

Variant coding for ETACS-ECU has not been implemented.
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 4 .
STEP 2. Using scan tool MB991958, check the other system DTC. Use scan tool to check that the DTC B222C is set in the ETACS-ECU. Q: Is the DTC set? YES: Troubleshoot the relevant DTC, and then go to Step 4 . NO: Go to Step 3.
STEP 3. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch to the "OFF" position. Turn the ignition switch to the "ON" position. Check that the ABS warning light goes out. NOTE: If the DTC U1415 is not deleted, the ABS warning light keeps illuminating. Q: Is DTC U1415 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 4. NO: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 4. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch to the "OFF" position. Turn the ignition switch to the "ON" position. Check that the ABS warning light goes out when the ignition switch is turned to the "ON" position. NOTE: If the DTC U1415 is not deleted, the ABS warning light keeps illuminating. Q: Is DTC U1415 set? YES: Return to Step 1 . NO: The procedure is complete.

DTC U1417 Variant coding value invalid (includes faulty installation)

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). If DTC U1417 is set in ASC-ECU, always diagnose the CAN bus lines. If there is any fault in the CAN bus lines, an incorrect DTC may be set. In this case, the set DTC is not highly reliable. Before replacing the ECU, ensure that the communication circuit is normal. When DTC U1417 is set in ASC-ECU, the DTC may also be set in ETACS-ECU. When the DTC is set in ETACS-ECU, carry out the diagnosis of the DTC for ETACS-ECU first. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.

ASC-ECU communicates with ETACS-ECU via CAN bus lines. This DTC is set when the vehicle information received from the ETACS-ECU is invalid.

Malfunction of ETACS-ECU
Malfunction of engine control module (ECM)
ETACS-ECUs have been interchanged between two vehicles.
Malfunction of ASC-ECU
External noise interference
ASC-ECUs have been interchanged between two vehicles.

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 3 . NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines Q: Is DTC U1417 set? YES: Go to Step 3. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, other system diagnostic trouble code Use scan tool to check whether any diagnostic trouble code related to vehicles information is set or not by the ETACS-ECU or engine control module (ECM). Q: Is the DTC set? YES: Troubleshoot for the relevant DTC. NO: Go to Step 4.
STEP 4. ETACS-ECU coding data check Refer to «PRECAUTIONS BEFORE SERVICE/CODING LIST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__coding-list) . Q: Is the check result normal? YES: Go to Step 5. NO: Replace the ETACS-ECU (Refer to «ETACS-ECU»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ), and then go to Step 7 .
STEP 5. Engine control module (ECM) coding data check Refer to «PRECAUTIONS BEFORE SERVICE/CODING LIST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__coding-list) . Q: Is the check result normal? YES: Go to Step 6. NO < 2.0L engine non-turbo >: Replace the engine control module (ECM) (Refer to «DIAGNOSIS/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-non-turbo-except-lancer-evolution) ), and then go to Step 7 . NO < 2.0L engine turbo >: Replace the engine control module (ECM) (Refer to «DIAGNOSIS/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-turbo-except-lancer-evolution) ), and then go to Step 7 . NO < 2.4L engine >: Replace the engine control module (ECM) (Refer to «DIAGNOSIS/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-24l-except-lancer-evolution) ), and then go to Step 7 .
STEP 6. Check the part number of ETACS-ECU Check the part number of ETACS-ECU. Q: Is the check result normal? YES: Go to Step 7. NO: Replace the ETACS-ECU (Refer to «ETACS-ECU»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ), and then go to Step 7.
STEP 7. Check the part number of ASC-ECU Check the part number of ASC-ECU. Q: Is the check result normal? YES: Go to Step 8. NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 9 .
STEP 8. Check whether the DTC is reset. Erase the DTC. Q: Is DTC U1417 set? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 9. NO: The trouble can be an intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ).
STEP 9. Check whether the DTC is reset. Erase the DTC. Q: Is DTC U1417 set? YES: Return to Step 1 . NO: The procedure is complete.

SYMPTOM CHART

CAUTION

ABS may operate in the following conditions without hard braking: Low mu road surface, high-speed turn, and bumpy road surface. When asking the customers, confirm that they have/have not encountered ABS operation in corresponding conditions. During ABS operation, the brake pedal is pulled forward gradually, and the noise occurs at the same time. This is because the brake line pressure varies intermittently to prevent the wheel lock, and not a system malfunction. During diagnosis, a DTC associated with other system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for DTC(s). If DTC(s) are set, erase them all.

Trouble symptom		Inspection procedure number	Reference
Scan tool cannot communicate with the ABS/ASC system.	Scan tool cannot communicate with all systems.		Refer to TROUBLESHOOTING .
Scan tool cannot communicate with the ABS/ASC system.	Scan tool cannot communicate only with ASC-ECU.	1	INSPECTION PROCEDURE 1: SCAN TOOL COMMUNICATION WITH ABS/ASC SYSTEM IS IMPOSSIBLE.
ASC OFF display flashes at a rate of 2Hz.		2	INSPECTION PROCEDURE 2: ASC OFF DISPLAY FLASHES AT A RATE OF 2HZ.
Brake warning light stays ON with the parking brake lever released (ABS warning light is OFF).		3	INSPECTION PROCEDURE 3: BRAKE WARNING LIGHT STAYS ON WITH THE PARKING BRAKE LEVER RELEASED.
ABS warning light does not illuminate when ignition switch is turned to the ON position (Engine stopped).		4	INSPECTION PROCEDURE 4: ABS WARNING LIGHT DOES NOT ILLUMINATE WHEN IGNITION SWITCH IS TURNED TO THE ON POSITION (ENGINE STOPPED).
Brake warning light does not illuminate when the ignition switch is turned to ON position (Engine stopped).		5	INSPECTION PROCEDURE 5: BRAKE WARNING LIGHT DOES NOT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO ON POSITION (ENGINE STOPPED).
ABS warning light stays ON after the engine is started.		6	INSPECTION PROCEDURE 6: ABS WARNING LIGHT STAYS ON AFTER THE ENGINE IS STARTED.
ASC warning display and light stay and light ON after the engine is started.		7	INSPECTION PROCEDURE 7: ASC WARNING DISPLAY AND LIGHT STAYS ON AFTER THE ENGINE IS STARTED.
ASC OFF display stays ON after the engine is started.		8	INSPECTION PROCEDURE 8: ASC OFF DISPLAY STAYS ON AFTER THE ENGINE IS STARTED.
The skid control/TCL system cannot be disabled when ASC OFF switch is pressed for 3 seconds or more to turn the system OFF.		9	INSPECTION PROCEDURE 9: THE SKID CONTROL/TCL SYSTEM CANNOT BE DISABLED WHEN ASC OFF SWITCH IS PRESSED FOR 3 SECONDS OR MORE TO TURN THE SYSTEM OFF.
Abnormality in brake operation		10	INSPECTION PROCEDURE 10: ABNORMALITY IN BRAKE OPERATION
Skid control/TCL does not work.		11	INSPECTION PROCEDURE 11: ASC DOES NOT OPERATE OR FAULTY ASC OPERATE.
ASC-ECU power supply circuit system		12	INSPECTION PROCEDURE 12: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM
ABS/skid control/TCL operates too frequently.		13	INSPECTION PROCEDURE 13: ABS/SKID CONTROL/TCL OPERATES TOO FREQUENTLY.
Steering wheel sensor power supply circuit system		14	INSPECTION PROCEDURE 14: STEERING WHEEL SENSOR POWER SUPPLY CIRCUIT SYSTEM
HSA (Hill Start Assist) does not work.		15	INSPECTION PROCEDURE 15: HSA (HILL START ASSIST) DOES NOT WORK.
HSA (Hill Start Assist) works on a flat road.		16	INSPECTION PROCEDURE 16: HSA (HILL START ASSIST) WORKS ON A FLAT ROAD.

SYMPTOM REFERENCE CHART

Inspection Procedure 1: Scan tool communication with ABS/ASC system is impossible

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. If the power is supplied with the ground circuit of CAN communication device open circuited, an electric potential abnormality may occur to the CAN bus lines. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

When scan tool cannot communicate with the ABS/ASC system, the CAN bus lines, ASC-ECU power supply circuit system, ground, or ASC-ECU may be faulty.

Damaged wiring harness and connectors
ASC-ECU malfunction
Wrong routing of scan tool harness
Abnormality in battery or generator
Abnormality in power supply voltage to ASC-ECU
ECU malfunction of other system

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scan tool CAN bus diagnosis

Use scan tool to diagnose the CAN bus lines.

Q: Is the check result normal?

YES: Check the power supply circuit, and repair if necessary (Refer to «INSPECTION PROCEDURE 12: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__inspection-procedure-12-asc-ecu-power-supply) ).
NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ).

When the ASC OFF display flashes at a rate of 2 Hz, the TCL control (brake control only) is prohibited.

This operation is performed for the following reasons and is not a malfunction.

ASC-ECU calculates the estimated temperature of the brake pad. In general, as the brake pad temperature increases, the coefficient of friction for the brake pad becomes smaller, resulting in the reduced braking force. When the estimated temperature of the brake pad reaches the specified value or more, ASC-ECU flashes the ASC OFF indicator light at a rate of 2 Hz to warn the driver that the brake controllability by TCL is decreased by the reduced braking force. Consequently, ASC-ECU prohibits the TCL control (brake control only) until it determines that the estimated temperature of the brake pad is normal. NOTE: In addition to severe driving, brake pad condition and brake drag are suspected as the cause of overheating. After the ASC OFF display has turned off, check the brake pad condition and brake drag.

Overheat of brake pad

Scheme 38

Scheme 38: Inspection Procedure 3: Brake warning light stays ON with the parking brake lever released

CAUTION

When the parking brake switch is turned ON, the combination meter terminal No. 4 is grounded, and then the brake warning light illuminates.
When reduction of the brake fluid amount is detected, the brake fluid level switch is turned from ON to OFF. ETACS-ECU monitors the brake fluid level switch, and instructs the combination meter via the CAN bus line to illuminate the brake warning light.

This may be caused by the ground fault in the parking brake switch circuit and the open circuit in the brake fluid level switch circuit.

The brake pad thickness is at the limit value or less.
The brake fluid amount is at the "LOWER" level or lower.
Poor adjustment of the parking brake lever
Damaged wiring harness and connectors
Parking brake switch malfunction
Brake fluid level switch malfunction
Combination meter malfunction
Malfunction of ETACS-ECU

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution) ). On completion, go to Step 2.
STEP 2. DTC check after resetting CAN bus lines Use scan tool to check that the DTC is set in the combination meter and ETACS-ECU. Q: Is any DTC set? YES: Carry out the diagnosis for the DTC. NO: Go to Step 3.
STEP 3. Brake fluid level check Check that the brake fluid is filled up to the "MIN" level or higher. Q: Is the check result normal? YES: Go to Step 5 . NO: Go to Step 4.
STEP 4. Brake pad check Refer to «ON-VEHICLE SERVICE/BRAKE PAD CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pad-check) . Q: Is the check result normal? YES: Fill the brake fluid up to the "MAX" level. Then go to Step 18 . NO: Replace the brake pad (Refer to «ON-VEHICLE SERVICE/BRAKE PAD REPLACEMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pad-replacement-except-ralliart) < Except RALLIART >, P.35A-24 < RALLIART >). Then go to Step 18 .
STEP 5. Brake fluid level switch check Refer to «ON-VEHICLE SERVICE/BRAKE FLUID LEVEL SWITCH CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-fluid-level-switch-check) . Q: Is the check result normal? YES: Go to Step 6. NO: Replace the reservoir tank assembly (Refer to «MASTER CYLINDER ASSEMBLY AND BRAKE BOOSTER ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) < Except RALLIART >, «MASTER CYLINDER AND BRAKE BOOSTER»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) < RALLIART >). Then go to Step 18 .
STEP 6. Connector check: A-06 brake fluid level switch connector, C-312 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 7. NO: Repair the damaged connector.
STEP 7. Measure the voltage at A-06 brake fluid level switch connector. Disconnect the connector, and measure at the wiring harness side. Turn the ignition switch to the "ON" position. Measure the voltage between the terminal No. 1 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 10 . NO: Go to Step 8.
STEP 8. Measure the voltage at the C-312 ETACS-ECU connector. CAUTION: With the C-312 ETACS-ECU connector kept connected, disconnect the A-06 brake fluid level switch connector. Turn the ignition switch to the ON position. Measure the voltage between terminal No. 1 and the body ground by backprobing. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 9. NO: Replace the ETACS-ECU (Refer to «ETACS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ). Then go to Step 18 .
STEP 9. Wiring harness check: between A-06 brake fluid level switch connector and C-312 ETACS-ECU connector Check for open circuit in the harness wire between A-06 brake fluid level switch connector terminal No. 1 and C-312 ETACS-ECU connector terminal No. 1. Q: Is the check result normal? YES: Go to Step 16 . NO: Repair the wiring harness. Then go to Step 18 .
STEP 10. Wiring harness check: between A-06 brake fluid level switch connector and body ground Check for open circuit in the harness wire between A-06 brake fluid level switch connector terminal No. 2 and body ground. Q: Is the check result normal? YES: Go to Step 11. NO: Repair the wiring harness.
STEP 11. Parking brake lever stroke check Refer to «ON-VEHICLE SERVICE/PARKING BRAKE LEVER STROKE CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/parking-brake-system/#parking-brakes-except-lancer-evolution__parking-brake-lever-stroke-check-and) . Q: Is the check result normal? YES: Go to Step 12. NO: Adjust the parking brake lever stroke (Refer to «ON-VEHICLE SERVICE/PARKING BRAKE LEVER STROKE CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/parking-brake-system/#parking-brakes-except-lancer-evolution__parking-brake-lever-stroke-check-and) ). Then go to Step 18 .
STEP 12. Parking brake switch check Refer to «ON-VEHICLE SERVICE/PARKING BRAKE SWITCH CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/parking-brake-system/#parking-brakes-except-lancer-evolution__parking-brake-switch-check) . Q: Is the check result normal? YES: Go to Step 13. NO: Replace the parking brake switch (Refer to «PARKING BRAKE LEVER»(/mitsubishi/lancer-evolution/x-2007-2016/remont/parking-brake-system/#parking-brakes-except-lancer-evolution) ). Then go to Step 18 .
STEP 13. Connector check: C-117 parking brake switch connector Q: Is the check result normal? YES: Go to Step 14. NO: Repair the damaged connector.
STEP 14. Measure the voltage at C-117 parking brake switch connector. Disconnect the connector, and measure at the wiring harness side. Turn the ignition switch to the "ON" position. Measure the voltage between the terminal No. 1 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 17 . NO: Go to Step 15.
STEP 15. Connector check: C-04 Combination meter connector, C-21 intermediate connector Q: Is the check result normal? YES: Go to Step 16. NO: Repair the defective connector.
STEP 16. Wiring harness check: between the C-04 combination meter connector and the C-117 parking brake switch connector Check for short circuit in the harness wire between the C-04 combination meter connector terminal No. 4 and the C-117 parking brake switch connector terminal No. 1. Q: Is the check result normal? YES: Go to Step 17. NO: Repair the wiring harness. Then go to Step 18 .
STEP 17. Retest the system. Q: Does the brake warning light turn ON and OFF normally according to the parking brake lever operation? YES: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Replace the combination meter assembly (Refer to «COMBINATION METER»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ). Then go to Step 18.
STEP 18. Retest the system. Q: Does the brake warning light turn ON and OFF normally according to the parking brake lever operation? YES: The procedure is complete. NO: Return to Step 1 .

Inspection Procedure 4: ABS warning light does not illuminate when ignition switch is turned to the ON position (engine stopped)

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU sends the illumination request signal of the ABS warning light to the combination meter through ETACS-ECU via CAN communication.
ASC-ECU illuminates the ABS warning light via ETACS-ECU for approximately 3 seconds for valve check with the ignition switch turned to the ON position.

This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ASC-ECU.

Damaged wiring harness and connectors
Malfunction of ETACS-ECU
Combination meter malfunction
ASC-ECU malfunction
Malfunction of coding data for ETACS-ECU

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ).
STEP 2. Using scan tool MB991958, diagnostic trouble code Use scan tool to check the diagnostic trouble code for the ASC system (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). Q: Is the DTC set? YES: Carry out the diagnosis for the diagnostic trouble code (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
STEP 3. Using scan tool MB991958, actuator test Perform the actuator test No. 07 of the combination meter system, and check if the ABS warning light illuminates (Refer to «COMBINATION METER/ACTUATOR TEST TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 4. NO: Diagnose the combination meter (Refer to «COMBINATION METER/TROUBLE SYMPTOM CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution__trouble-symptom-chart) ). Then go to Step 8 .
STEP 4. ETACS-ECU coding data check Use scan tool to check if coding data stored in ETACS-ECU is normal (Refer to «PRECAUTIONS BEFORE SERVICE/CODING LIST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__coding-list) ). Q: Is the check result normal? YES: Go to Step 5. NO: Replace the ETACS-ECU, and then go to Step 8 .
STEP 5. Using scan tool MB991958, other system diagnostic trouble code Using scan tool, check that the DTC U0141 is not set by the combination meter system. Q: Is the DTC U0141 set? YES: Troubleshoot the combination meter (Refer to «COMBINATION METER/TROUBLESHOOTING»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ), and then go to Step 8 . NO: Go to Step 6.
STEP 6. Using scan tool MB991958, other system diagnostic trouble code Using scan tool, check that the DTC U0121 is not set by the ETACS system. Q: Is the DTC U0121 set? YES: Troubleshoot the ETACS-ECU (Refer to «ETACS-ECU/TROUBLESHOOTING»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ), and then go to Step 8 . NO: Go to Step 7.
STEP 7. Retest the system. Q: Does the ABS warning light turn ON and OFF normally? YES: Intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .) NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8.
STEP 8. Retest the system. Q: Does the ABS warning light turn ON and OFF normally? YES: The procedure is complete. NO: Return to Step 1 .

Inspection Procedure 5: Brake warning light does not illuminate when the ignition switch is turned to ON position (engine stopped)

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU sends the illumination request signal of the break warning light to the combination meter through ETACS-ECU via the CAN communication.
ASC-ECU illuminates brake warning light via ETACS-ECU for approximately 3 seconds for bulb check with the ignition switch turned to the ON position.

This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ASC-ECU.

Damaged wiring harness and connectors
Malfunction of ETACS-ECU
Malfunction of the combination meter
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines. (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) .) Then go to Step 7 .
STEP 2. Using scan tool MB991958, check the DTC Use scan tool to check the DTC for the ASC system. Q: Is the DTC set? YES: Carry out the diagnosis for the DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
STEP 3. Actuator test of combination meter Perform the following actuator test by the combination meter system, and check if the brake warning light illuminates (Refer to «COMBINATION METER/ACTUATOR TEST TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ). Item No. 07: Indicator 1 Q: Is the check result normal? YES: Go to Step 4. NO: Diagnose the combination meter (Refer to «COMBINATION METER/TROUBLE SYMPTOM CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution__trouble-symptom-chart) ). Then go to Step 7 .
STEP 4. Using scan tool MB991958, check the other system DTC Using scan tool, check that DTC U0141 is not set by the combination meter system. Q: Is the DTC set? YES: Diagnose the combination meter (Refer to «COMBINATION METER/DTC»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution__dtc-u0141-etacs-can-timeout) ). Then go to Step 7 . NO: Go to Step 5.
STEP 5. Using scan tool MB991958, check the other system DTC Using scan tool, check that DTC U0121 is not set by the ETACS system. Q: Is the DTC set? YES: Perform troubleshooting on ETACS-ECU (Refer to «ETACS/DTC»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution__dtc-u0121-asc-ecu-can-timeout) ). Then go to Step 7 . NO: Go to Step 6.
STEP 6. Retest the system. Q: Does the brake warning light turn ON and OFF YES: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 7.
STEP 7. Retest the system. Q: Does the brake warning light turn ON and OFF normally? YES: The procedure is complete. NO: Return to Step 1 .

Inspection Procedure 6: ABS warning light stays ON after the engine is started

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU sends the illumination request signal of the ABS warning light to the combination meter through ETACS-ECU via CAN communication.
ASC-ECU illuminates the ABS warning light via ETACS-ECU for approximately 3 seconds for valve check with the ignition switch turned to the ON position.

This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ASC-ECU.

Damaged wiring harness and connectors
Malfunction of ETACS-ECU
Combination meter malfunction
ASC-ECU malfunction
Control stop due to the low voltage NOTE: Due to the abnormality in the supply voltage, the DTC may not be set even when the ABS warning light is illuminated.

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). Then go to Step 8 .
STEP 2. Using scan tool MB991958, check the DTC Use scan tool to check the DTC for the ASC system. Q: Is the DTC set? YES: Carry out the diagnosis for the DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
STEP 3. Actuator test of combination meter Perform the following actuator test by the combination meter system, and check if the ABS warning light illuminates normally (Refer to «COMBINATION METER/ACTUATOR TEST TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ). Item No. 07: Indicator 1 Q: Is the check result normal? YES: Go to Step 4. NO: Replace the combination meter (Refer to «COMBINATION METER»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ). Then go to Step 8 .
STEP 4. Check the ASC-ECU power supply circuit system. Refer to «INSPECTION PROCEDURE 12: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__inspection-procedure-12-asc-ecu-power-supply) . Q: Is the check result normal? YES: Go to Step 5. NO: Diagnose the power supply circuit of the ASC-ECU (Refer to «INSPECTION PROCEDURE 12: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__inspection-procedure-12-asc-ecu-power-supply) ).
STEP 5. Using scan tool MB991958, check the other system DTC Using scan tool, check that DTC U0141 is not set by the combination meter system. Q: Is the DTC set? YES: Diagnose the combination meter (Refer to «COMBINATION METER/DTC»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution__dtc-u0141-etacs-can-timeout) ). Then go to Step 8 . NO: Go to Step 6.
STEP 6. Using scan tool MB991958, check the other system DTC Using scan tool, check that DTC U0121 is not set by the ETACS system. Q: Is the DTC set? YES: Perform troubleshooting on ETACS-ECU (Refer to «ETACS/DTC»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution__dtc-u0121-asc-ecu-can-timeout) ). Then go to Step 8 . NO: Go to Step 7.
STEP 7. Retest the system. Erase the DTC. Drive the vehicle at 6 mph (10 km/h) or higher. Q: Does the ABS warning light turn ON and OFF normally? YES: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8.
STEP 8. Retest the system. Erase the DTC. Drive the vehicle at 6 mph (10 km/h) or higher. Q: Does the ABS warning light turn ON and OFF normally? YES: The procedure is complete. NO: Return to Step 1 .

Inspection Procedure 7: ASC warning display and light stays ON after the engine is started

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU sends the illumination request signal of the ASC warning display and light to the combination meter through ETACS-ECU via the CAN communication.

This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ASC-ECU.

Damaged wiring harness and connectors
Malfunction of ETACS-ECU
Combination meter malfunction
ASC-ECU malfunction
Control is disabled due to the low voltage NOTE: Due to the abnormality in the supply voltage, the DTC may not be set even when the ASC warning display illuminates.

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). Then go to Step 8 .
STEP 2. Using scan tool MB991958, check the DTC Use scan tool to check the DTC for the ASC system. Q: Is the DTC set? YES: Carry out the diagnosis for the DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
STEP 3. Actuator test of combination meter Perform the following actuator test by the combination meter system, and check if the ASC warning display illuminates normally (Refer to «COMBINATION METER/ACTUATOR TEST TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ). Item No. 13: Indicator 4 Q: Is the check result normal? YES: Go to Step 4. NO: Replace the combination meter (Refer to «COMBINATION METER»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ). Then go to Step 8 .
STEP 4. Check the ASC-ECU power supply circuit system. Refer to «INSPECTION PROCEDURE 12: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__inspection-procedure-12-asc-ecu-power-supply) . Q: Is the check result normal? YES: Go to Step 5. NO: Diagnose the power supply circuit of the ASC-ECU (Refer to «INSPECTION PROCEDURE 12: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__inspection-procedure-12-asc-ecu-power-supply) ).
STEP 5. Using scan tool MB991958, check the other system DTC Using scan tool, check that DTC U0141 is not set by the combination meter system. Q: Is the DTC set? YES: Diagnose the combination meter (Refer to «COMBINATION METER/DTC»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution__dtc-u0141-etacs-can-timeout) ). Then go to Step 8 . NO: Go to Step 6.
STEP 6. Using scan tool MB991958, check the other system DTC Using scan tool, check that DTC U0121 is not set by the ETACS system. Q: Is the DTC set? YES: Perform troubleshooting on ETACS-ECU (Refer to «ETACS/DTC»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution__dtc-u0121-asc-ecu-can-timeout) ). Then go to Step 8 . NO: Go to Step 7.
STEP 7. Retest the system. Q: Does the ASC warning display and light turn ON and OFF normally? YES: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .) NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 8.
STEP 8. Retest the system. Q: Does the ASC warning display and light turn ON and OFF normally? YES: The procedure is complete. NO: Return to Step 1 .

Scheme 39

Scheme 39: Inspection Procedure 8: ASC OFF display stays ON after the engine is started

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU sends the illumination request signal of ASC OFF display or ASC OFF light to the combination meter through ETACS-ECU via CAN communication.
By the operation of ASC OFF switch, the ASC OFF display or ASC OFF light illuminates when the ASC function is stopped.
When the ASC OFF switch is pressed for 3 seconds or more, the ASC system turns OFF.
When the ASC OFF switch is pressed for 15 seconds or more, the ASC is kept in ON state and the system cannot be turned OFF until the ignition switch is turned to the ON position next time.

This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ASC-ECU.

Damaged wiring harness and connectors
Malfunction of ETACS-ECU
Combination meter malfunction
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). Then go to Step 10 .
STEP 2. Using scan tool MB991958, check the DTC Use scan tool to check the DTC for the ASC system. Q: Is the DTC set? YES: Carry out the diagnosis for the DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
STEP 3. Actuator test of combination meter Perform the following actuator test by the combination meter system, and check if the ASC OFF display or light illuminates normally (Refer to «COMBINATION METER/ACTUATOR TEST TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ). Item No. 7: Indicator 1 Q: Is the check result normal? YES: Go to Step 4. NO: Replace the combination meter (Refer to «COMBINATION METER»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ). Then go to Step 9 .
STEP 4. ASC OFF switch check Refer to «ASC OFF SWITCH CONTINUITY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) . Q: Is the check result normal? YES: Go to Step 5. NO: Replace ASC OFF switch (Refer to «ASC OFF SWITCH»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10 .
STEP 5. Connector check: C-313 ETACS-ECU connector, C-36 intermediate connector, C-45 ASC OFF switch connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair the damaged connector.
STEP 6. Wiring harness check between C-313 ETACS-ECU connector terminal No. 15 and C-45 ASC OFF switch connector terminal No. 1 Check the power supply circuit for short circuit. Q: Is the check result normal? YES: Go to Step 7. NO: Repair the wiring harness between C-313 ETACS-ECU connector terminal No. 15 and C-45 ASC OFF switch connector terminal No. 1.
STEP 7. Using scan tool MB991958, check the DTC for other systems Using scan tool, check that DTC U0141 is not set by the combination meter system. Q: Is the DTC set? YES: Diagnose the combination meter (Refer to «COMBINATION METER/DTC»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution__dtc-u0141-etacs-can-timeout) ). Then go to Step 10 . NO: Go to Step 8.
STEP 8. Using scan tool MB991958, check the DTC for other systems Using scan tool, check that DTC U0121 is not set by the ETACS system. Q: Is the DTC set? YES: Perform troubleshooting on ETACS-ECU (Refer to «ETACS/DTC»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution__dtc-u0121-asc-ecu-can-timeout) ). Then go to Step 9. NO: Go to Step 9.
STEP 9. Retest the system. Q: Does ASC OFF display turn OFF normally? YES: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 10.
STEP 10. Retest the system. Q: Does ASC OFF display turn OFF normally? YES: The procedure is complete. NO: Return to Step 1 .

Inspection Procedure 9: The skid control/TCL system cannot be disabled when ASC OFF switch is pressed for 3 seconds or more to turn the system OFF

CAUTION

ETACS-ECU terminal No. 15 is grounded by pressing ASC OFF switch. The ON/OFF state of ASC OFF switch is transferred from ETACS-ECU to ASC-ECU via CAN bus line.
When the ASC OFF switch is pressed for 3 seconds or more, the ASC system turns OFF.
When the ASC OFF switch is pressed and held for 15 seconds or more, ASC turns ON.

This may be caused by the open and short circuit in the ASC OFF switch circuit.

Damaged wiring harness and connectors
ASC OFF switch malfunction
Malfunction of ETACS-ECU

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). Then go to Step 7 .
STEP 2. ASC OFF switch check Refer to «ASC OFF SWITCH CONTINUITY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) . Q: Is the check result normal? YES: Go to Step 3. NO: Replace ASC OFF switch (Refer to «ASC OFF SWITCH»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 7 .
STEP 3. Connector check: C-313 ETACS-ECU connector, C-36 intermediate connector, C-45 ASC OFF switch connector Q: Is the check result normal? YES: Go to Step 4. NO: Repair the damaged connector.
STEP 4. Wiring harness check between C-313 ETACS-ECU connector terminal No. 15 and C-45 ASC OFF switch connector terminal No. 1 Check the signal circuit for open and short circuit. Q: Is the check result normal? YES: Go to Step 5. NO: Repair the wiring harness between C-313 ETACS-ECU connector terminal No. 15 and C-45 ASC OFF switch connector terminal No. 1.
STEP 5. Wiring harness check between C-45 ASC OFF switch connector terminal No. 2 and the body ground Check the ground wires for open circuit. Q: Is the check result normal? YES: Go to Step 6. NO: Repair the wiring harness between C-45 ASC OFF switch connector terminal No. 2 and the body ground.
STEP 6. Retest the system. Q: Does ASC turn ON and OFF normally using ASC OFF switch? YES: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Replace the ETACS-ECU (Refer to «ETACS-ECU»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ). Then go to Step 7.
STEP 7. Retest the system. Q: Does ASC turn ON and OFF normally using ASC OFF switch? YES: The procedure is complete. NO: Return to Step 1 .

Inspection Procedure 10: Abnormality in brake operation

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

Although the cause of the trouble cannot be clearly resolved since it depends on the running status and road surface condition, the malfunction of the hydraulic circuit may occur if any DTC is not detected.

Hydraulic unit (Integrated with ASC-ECU) malfunction
Malfunction of hydraulic circuit
Malfunction of brake assembly
Malfunction of brake booster
Malfunction of master cylinder assembly

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. DTC check Use scan tool to check the DTC for the ASC system. (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) .) Q: Is the check result normal? YES: Go to Step 2. NO: Troubleshoot for the relevant DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ).
STEP 2. Hydraulic unit (Integrated with ASC-ECU) check Check that the brake tube is installed to the hydraulic unit (integrated with ASC-ECU) correctly (Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) ). Q: Is the check result normal? YES: Go to Step 3. NO: Connect the brake tubes correctly, repair the external brake lines, or replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ).
STEP 3. Brake operation check Perform the following checks. Brake pedal check (Refer to «ON-VEHICLE SERVICE/BRAKE PEDAL CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pedal-check-and-adjustment) ). Brake booster check (Refer to «ON-VEHICLE SERVICE/BRAKE BOOSTER OPERATING CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) ). Check valve check (Refer to «ON-VEHICLE SERVICE/CHECK VALVE OPERATION CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) ). Q: Can any fault be found with the brake operation? YES: Check the brake-related parts, and repair if necessary. Then, go to Step 4. NO: Go to Step 4.
STEP 4. Hydraulic unit check Perform the following actuator tests (Refer to «ACTUATOR TEST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__actuator-test-reference-table) ). Item No. 01: FL wheel ABS drive Item No. 02: FR wheel ABS drive Item No. 03: RL wheel ABS drive Item No. 04: RR wheel ABS drive Item No. 05: FL wheel TCL drive Item No. 06: FR wheel TCL drive Item No. 07: RL wheel TCL drive Item No. 08: RR wheel TCL drive Q: Is the check result normal? YES: The procedure is complete. NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ).

Inspection Procedure 11: ASC does not operate or faulty ASC operate

CAUTION

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

In case of this trouble symptom, the skid control/TCL system operation may be disabled. DTC may be set by the skid control/TCL system using scan tool.

Low battery output
Wiring harness or connector failure of CAN bus line
ASC-ECU malfunction
Engine coding data problem

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. DTC check Use scan tool to check the DTC for the ASC system (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). Q: Is the check result normal? YES: Go to Step 2. NO: Carry out the diagnosis for the DTC (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ).
STEP 2. Engine ECU coding data check Using scan tool, check if any abnormality is present to the coding data below which are stored in the ECM (Refer to «PRECAUTIONS BEFORE SERVICE/CODING LIST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__coding-list) ). A.S.C. OK: Available Q: Is the check result normal? YES: Go to Step 3. NO: Replace the engine ECU (Refer to «ECM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-non-turbo-except-lancer-evolution) < 2.0L engine-turbo > or «ECM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-turbo-except-lancer-evolution) < 2.0L engine-non-turbo > or «ECM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-24l-except-lancer-evolution) < 2.4L engine >). Then go to Step 4 .
STEP 3. Hydraulic unit (integrated with ASC-ECU) check Check that the brake tube is correctly mounted to the hydraulic unit (integrated with ASC-ECU) (Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) ). Q: Is the check result normal? YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__wheel-speed-sensor-output-current-measurement) ). Then go to Step 4. NO: Connect the brake tubes correctly, and repair or replace the external brake lines of the hydraulic unit (integrated with ASC-ECU).
STEP 4. Operation check Q: Does skid control/TCL operate normally? YES: The procedure is complete. NO: Check the brake system related components other than the skid control/TCL system.

Inspection Procedure 12: ASC-ECU power supply circuit system

CAUTION

When the ASC-ECU power supply voltage becomes 9.7 ± 0.3 V or less, the ABS warning lamp, ASC warning display, and ASC OFF display illuminate, and the ABS, stability control, and TCL controls are prohibited. If the battery terminal is not tightened properly, a dump surge may occur and the power supply voltage may become abnormally high for a short time. If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

ASC-ECU contains the power supply circuit (terminal No. 32) for the solenoid valve. The solenoid valve is energized by the valve relay, which is incorporated in ASC-ECU.
ASC-ECU contains the power supply circuit (terminal No. 2) for ASC-ECU. The power is supplied from the fusible link No. 34 through the multi-purpose fuse No. 17.
ASC-ECU contains the power supply circuit (terminal No. 8) for ASC-ECU. When the ignition switch (IG1) is turned ON, the voltage is applied to the relay incorporated in ETACS-ECU to turn ON the relay, and the power is supplied from the fusible link No. 34 through multi-purpose fuse No. 12.
ASC-ECU contains the power supply circuit (terminal No. 1) for the pump motor. The pump motor is energized by the motor switch, which is incorporated in ASC-ECU.
When malfunction occurs in ASC-ECU power supply, the communication with scan tool becomes unavailable.

Damaged wiring harness and connectors
Fuse and fusible link malfunction
Improper tightening of battery terminal
Improper tightening of ground bolt
Battery failure
Charging system failed
ASC-ECU malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Scheme 50

STEP 1. Battery check Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) . Q: Is the battery in good condition? YES: Go to Step 3 . NO: Charge or replace the battery. Then go to Step 2.
STEP 2. Charging system check Refer to «ON-VEHICLE SERVICE/GENERATOR OUTPUT LINE VOLTAGE DROP TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/charging-system/#charging-system-except-lancer-evolution) . Q: Is the charging system in good condition? YES: Go to Step 3. NO: Repair or replace the charging system component(s).
STEP 3. Connector check: A-51 ASC-ECU connector, C-128 intermediate connector, C-317 ETACS-ECU connector, C-315 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 4. NO: Repair the damaged connector.
STEP 4. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the voltage between terminal No. 32 and body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 7 . NO: Go to Step 5.
STEP 5. Fusible link check: Check the fusible link No. 27. Q: Is the check result normal? YES: The open circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 32 and the fusible link No. 27. Then go to Step 20 . NO: Go to Step 6.
STEP 6. Resistance measurement at A-51 ASC-ECU connector Removal the fusible link No. 27. Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the resistance between the terminal No. 32 and the body ground. OK: No continuity Q: Is the check result normal? YES: Replace the fusible link No. 27. Then go to Step 20 . NO: The short circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 32 and the fusible link No. 27, and then replace the fusible link No. 27. Then go to Step 20 .
STEP 7. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the voltage between terminal No. 1 and body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 10 . NO: Go to Step 8.
STEP 8. Check the fusible link No. 26. Q: Is the check result normal? YES: The open circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 1 and the fusible link No. 26. Then go to Step 20 . NO: Go to Step 9.
STEP 9. Resistance measurement at A-51 ASC-ECU connector Removal the fusible link No. 26. Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the resistance between the terminal No. 1 and the body ground. OK: No continuity Q: Is the check result normal? YES: Replace the fusible link No. 26. Then go to Step 20 . NO: The short circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 1 and the fusible link No. 26, and then replace the fusible link No. 26. Then go to Step 20 .
STEP 10. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Ignition switch: ON position. Measure the voltage between terminal No. 8 and body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 14 . NO: Go to Step 11.
STEP 11. Check the fuse No. 12. Visually check for open circuit in fuse No. 12. Q: Is the check result normal? YES: Go to Step 12. NO: Go to Step 13 .
STEP 12. Resistance measurement at A-51 ASC-ECU connector Disconnect the C-317 ETACS-ECU connector. Disconnect the A-51 ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the resistance between the A-51 ASC-ECU connector terminal No. 8 and the C-317 ETACS-ECU connector terminal No. 5. OK: Continuity exists (2 ohms or less) Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: The open circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 8 and the C-317 ETACS-ECU connector terminal No. 5. Then go to Step 20 .
STEP 13. Resistance measurement at A-51 ASC-ECU connector Disconnect the C-317 ETACS-ECU connector. Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the resistance between the terminal No. 8 and the body ground. OK: No continuity Q: Is the check result normal? YES: Replace the fuse No. 12. Then go to Step 20 . NO: The short circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 8 and the C-317 ETACS-ECU connector terminal No. 5, and then replace the fuse No. 12. Then go to Step 20 .
STEP 14. Voltage measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the voltage at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the voltage between terminal No. 2 and body ground. OK: Approximately battery positive voltage Q: Is the check result normal? YES: Go to Step 18 . NO: Go to Step 15.
STEP 15. Check the fuse No. 17. Visually check for open circuit in fuse No. 17. Q: Is the check result normal? YES: Go to Step 16. NO: Go to Step 17 .
STEP 16. Resistance measurement at A-51 ASC-ECU connector Disconnect the C-315 ETACS-ECU connector. Disconnect the A-51 ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the resistance between the A-51 ASC-ECU connector terminal No. 2 and the C-315 ETACS-ECU connector terminal No. 4. OK: Continuity exists (2 ohms or less) Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: The open circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 2 and the C-315 ETACS-ECU connector terminal No. 4. Then go to Step 20 .
STEP 17. Resistance measurement at A-51 ASC-ECU connector Disconnect the C-315 ETACS-ECU connector. Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the resistance between the terminal No. 2 and the body ground. OK: No continuity Q: Is the check result normal? YES: Replace the fuse No. 17. Then go to Step 20 . NO: The short circuit may be present in the power supply circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 2 and the C-315 ETACS-ECU connector terminal No. 4, and then replace the fuse No. 17. Then go to Step 20 .
STEP 18. Resistance measurement at the A-51 ASC-ECU connector Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the harness-side connector, and then measure the resistance at the special tool connector side. NOTE: Do not connect the special tool ASC check harness (MB991997) to ASC-ECU. Measure the resistance between terminal No. 16 and body ground, and between terminal No. 47 and body ground. OK: Continuity exists (2 ohms or less) Q: Is the check result normal? YES: Go to Step 19. NO: An open circuit may be present in the ground circuit. Repair the wiring harness between the A-51 ASC-ECU connector terminal No. 16 and the body ground, and between the A-51 ASC-ECU connector terminal No. 47 and the body ground.
STEP 19. Retest the system. Make sure that the scan tool cable is properly connected and the V.C.I. switch is ON. Q: Is the communication with scan tool possible? YES: Intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 20.
STEP 20. Retest the system. Q: Is the communication with scan tool possible? YES: Return to Step 1 . NO: This diagnosis is complete.

Inspection Procedure 13: ABS/skid control/TCL operates too frequently

CAUTION

Although the cause of the trouble cannot be clearly resolved since it depends on the running status and road surface condition, the malfunction of the hydraulic circuit may occur if any diagnostic trouble code is not detected.
If wheels and tires other than the ones with genuine specified size are mounted, the ABS/skid control/TCL may be activated prematurely.
If a non-genuine braking device or non-genuine impact reduction device is mounted, the ABS/skid control/TCL may be activated prematurely.

Mounting of wheels and tires other than with genuine specified size
Tire pressure abnormality
Tire wear and deterioration
Mounting of non-genuine braking device or impact reduction device
Wheel alignment abnormality
Malfunction of brake related parts
Malfunction of the wheel speed sensor
Malfunction of the G and yaw rate sensor
Steering wheel sensor malfunction
Malfunction of hydraulic unit (integrated with ASC-ECU)
Malfunction of hydraulic circuit
External radio wave noise interference

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. Check the wheels and the tires. Carry out the following check. Size check of wheels and tires Tire wear and deterioration statuses Check the tire pressure. NOTE: For the tire pressure, refer to the tire pressure label attached to the lower section of driver's side door striker. Q: Is the check result normal? YES: Go to Step 2. NO: Correct the wheels and tires in good condition. Then go to Step 9 .
STEP 2. Diagnostic trouble code check Use scan tool MB991958 to check the diagnostic trouble code for the ASC system (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). Q: Is the check result normal? YES: Go to Step 3. NO: Carry out the diagnosis for the diagnostic trouble code. (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) .) Then go to Step 9 .
STEP 3. Check of brake system related components other than hydraulic unit (integrated with ABS-ECU) At the same time with the following checks, also check that no parts other than the genuine parts are mounted. Brake pad check (Refer to «ON-VEHICLE SERVICE/BRAKE PAD CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution__brake-pad-check) ). Brake disc runout check (Refer to «ON-VEHICLE SERVICE/BRAKE DISC ROTOR CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) ). Brake drag force check (Refer to «ON-VEHICLE SERVICE/BRAKE DRAG FORCE CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical-hydraulic/#basic-brake-system-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 4. NO: Repair or replace the part(s) having damage or other problems. Then go to Step 9 .
STEP 4. Wheel alignment check At the same time with the following checks, also check that no parts other than the genuine parts are mounted. Front wheel alignment check (Refer to «ON-VEHICLE SERVICE/FRONT WHEEL ALIGNMENT CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/suspension-front/#front-suspension-wheel-alignment-except-lancer-evolution__front-wheel-alignment-check-and-adjustment) ). Rear wheel alignment check (Refer to «ON-VEHICLE SERVICE/REAR WHEEL ALIGNMENT CHECK AND ADJUSTMENT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/suspension-rear/#rear-suspension-wheel-alignment-except-lancer-evolution__rear-wheel-alignment-check-and-adjustment) ). Q: Is the check result normal? YES: Go to Step 5. NO: Repair or replace the part(s) having damage or other problems. Then go to Step 9 .
STEP 5. Wheel speed sensor check Check that no non-genuine electronic device or no wiring harness of other than genuine electronic device is mounted near the wheel speed sensor (at wheel speed detection section and wiring harness section) (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 6. NO: Remove the non-genuine electronic device or the wiring harness of non-genuine electronic device. Then go to Step 9 .
STEP 6. M.U.T.-III data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 01: FL wheel speed sensor Item 02: FR wheel speed sensor Item 03: RL wheel speed sensor Item 04: RR wheel speed sensor Item 08: Lateral G-sensor Item 11: Steering angle sensor Item 12: Yaw rate sensor Q: Is the check result normal? YES: Go to Step 7. NO (Abnormality with items 01 to 04): Check the installation status of corresponding wheel speed sensor (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO (Abnormality with items 08, 12): Check the installation status of G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). NO (Abnormality with item 11): Check the installation status of steering wheel sensor (Refer to «STEERING WHEEL SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ).
STEP 7. Hydraulic unit check Carry out the following actuator tests, and check if they work normally (Refer to «ACTUATOR TEST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__actuator-test-reference-table) ). Item No. 01: FL wheel ABS Item No. 02: FR wheel ABS Item No. 03: RL wheel ABS Item No. 04: RR wheel ABS Item No. 05: FL wheel TCL Item No. 06: FR wheel TCL Item No. 07: RL wheel TCL Item No. 08: RR wheel TCL Q: Is the check result normal? YES: Go to Step 8. NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9 .
STEP 8. ABS/skid control/TCL operation check Q: Is the check result normal? YES: Intermittent malfunction (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 9.
STEP 9. ABS/skid control/TCL operation check Q: Is the check result normal? YES: The procedure is complete. NO: Return to Step 1 .

Scheme 51

Scheme 51: Inspection Procedure 14: Steering wheel sensor power supply circuit system

CAUTION

If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to STEERING WHEEL SENSOR CALIBRATION ).

Steering wheel sensor contains the power supply circuit (terminal No. 2) for Steering wheel sensor. The power is supplied from the ETACS-ECU (terminal No. 5). The power is supplied from the fusible link No. 34 through the multi-purpose fuse No. 12.
When malfunction occurs in Steering wheel sensor power supply, the communication with scan tool becomes unavailable.

Damaged wiring harness and connectors
Fuse and fusible link malfunction
Improper tightening of battery terminal
Battery failure
Charging system failed
Steering wheel sensor malfunction

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

STEP 1. Connector check: C-211 steering wheel sensor connector Q: Is the check result normal? YES: Go to Step 2. NO: Repair the damaged connector.
STEP 2. Resistance measurement at C-211 steering wheel sensor connector. Disconnect C-211 steering wheel sensor connector and measure the resistance available at the wiring harness side of the connector. Check the continuity between C-211 steering wheel sensor connector terminal No. 5 and body ground. OK: Continuity exists (2 ohms or less) Q: Is the check result normal? YES: Go to Step 4 . NO: Go to Step 3.
STEP 3. Check the wiring harness between C-211 steering wheel sensor connector terminal No. 5 and the body ground. Check the ground wires for open circuit. Q: Is the check result normal? YES: If a trouble is solved, it is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Repair the wiring harness.
STEP 4. Connector check: C-309 ETACS-ECU connector, C-317 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the damaged connector.
STEP 5. Voltage measurement at C-309 ETACS-ECU connector Disconnect C-306 ETACS-ECU connector and measure the voltage available at the wiring harness side of the connector. Measure the voltage between C-309 ETACS-ECU connector terminal No. 1 and body ground. OK: System voltage Q: Is the check result normal? YES: Go to Step 7 . NO: Go to Step 6.
STEP 6. Check the wiring harness between fusible link No. 34 and C-309 ETACS-ECU connector terminal No. 1. Check the power supply lines (battery power supply) for open circuit and short circuit. Q: Is the check result normal? YES: If a trouble is solved, it is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Repair the wiring harness.
STEP 7. Measure the voltage at the C-211 steering wheel sensor connector. Disconnect C-211 steering wheel sensor connector and measure the voltage at the wiring harness side of the connector. Turn the ignition switch to the ON position. Measure the voltage between the terminal No. 2 and the body ground. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 10 . NO: Go to Step 8.
STEP 8. Check the fuse No. 12. Visually check for open circuit in fuse No. 12. Q: Is the check result normal? YES: Go to Step 9. NO: The short circuit may be present in the power supply circuit. Check the wiring harness between the C-211 steering wheel sensor connector terminal No. 2 and the C-317 ETACS-ECU connector terminal No. 5, and repair if necessary. And then replace the fuse No. 12.
STEP 9. Check the wiring harness between C-211 steering wheel sensor connector terminal No. 2 and C-317 ETACS-ECU connector terminal No. 5. Check the power supply lines (battery power supply) for open circuit. Q: Is the check result normal? YES: Go to Step 10. NO: Repair the wiring harness between the C-211 steering wheel sensor connector terminal No. 2 and the C-317 ETACS-ECU connector terminal No. 5.
STEP 10. Using scan tool MB991958, check the ETACS system data list Check the input signal of IG1 relay. Turn the ignition switch to the ON position. ITEM CHART Item No. Item name Normal condition Item 254 IG voltage System voltage OK: Normal condition is displayed. Q: Is the check result normal? YES: Replace the steering wheel sensor. NO: Refer to .

Inspection Procedure 15: HSA (Hill Start Assist) does not work

CAUTION

If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

The slope gradient may be low.
The vehicle is not completely stationary.
A failure may have occurred in the calibration of the G and yaw rate sensor or brake fluid pressure sensor.
The parking brake switch may be seized, which causes the HSA to fail to start the operation.
A problem (noise interference) may have occurred in the CAN bus line, resulting in an improper communication with ASC-ECU or each ECU. NOTE: The HSA does not work even when the wheel speed sensor outputs pulse (vehicle moved) while the vehicle is parked. The HSA is affected by the loading conditions and vehicle posture at the occurrence of phenomenon. When checking the HSA operation in actual driving, carry out the check on the vehicle with one occupant (driver) only.

Improper installation of the G and yaw rate sensor
G and yaw rate sensor malfunction
Calibration failure of the brake fluid pressure sensor
Seizure of the parking brake switch
Malfunction of wheel speed sensor
Malfunction of hydraulic unit (integrated with ASC-ECU)
Wiring harness or connector failure of CAN bus line
Damaged wiring harness and connectors

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
MB991997: ASC check harness

STEP 1. HSA operation check Check if the HSA works with one occupant (driver) only in the vehicle. Q: Is the check result normal? YES: This diagnosis is complete. NO: Go to Step 2.
STEP 2. Parking brake check With the parking brake not pulled, check if the brake warning light is illuminated. Q: Is the brake warning light illuminated with the parking brake not pulled? YES: Carry out the «INSPECTION PROCEDURE 3 "BRAKE WARNING LIGHT STAYS ON WITH THE PARKING BRAKE LEVER RELEASED (ABS WARNING LIGHT IS OFF)."»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) (Refer to ). NO: Go to Step 3.
STEP 3. Using scan tool MB991958, diagnose the CAN bus line. Use scan tool to diagnose the CAN bus lines. Q: Is the check result normal? YES: Go to Step 4. NO: Repair the CAN bus lines (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ). Then go to Step 14 .
STEP 4. Using scan tool MB991958, check the DTC Use scan tool MB991958 to check the DTC for the ASC system. Q: Is the DTC set? YES: Carry out the diagnosis for the diagnostic trouble code (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 5.
STEP 5. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 120: Parking brake switch (Input) Q: Is the check result normal? YES: Go to Step 6. NO: Carry out the «INSPECTION PROCEDURE 3 "BRAKE WARNING LIGHT STAYS ON WITH THE PARKING BRAKE LEVER RELEASED (ABS WARNING LIGHT IS OFF)."»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) (Refer to ), and then go to Step 14 .
STEP 6. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 09: G sensor Item 12: Yaw rate sensor Q: Is the check result normal? YES: Go to Step 10 NO: Go to Step 7
STEP 7. Connector check: A-51 ASC-ECU connector, C-137 G and yaw rate sensor Q: Is the check result normal? YES: Go to Step 8. NO: Repair the connector, and then go to Step 14 .
STEP 8. Check the harness wire between C-137 G and yaw rate sensor connector terminal No. 2, 3 and A-51 ASC-ECU connector No. 18, 19. Check the communication lines for open circuit and short circuit. Q: Is the check result normal? YES: Go to Step 9. NO: Repair the wiring harness, and then go to Step 14 .
STEP 9. G and yaw rate sensor installation check Check that the G and yaw rate sensor is installed correctly. Q: Is the check result normal? YES: Carry out the calibration of the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__g-and-yaw-rate-sensor-calibration) ). Then go to Step 10 NO: Reinstall the G and yaw rate sensor correctly (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 14 .
STEP 10. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 10: Master cylinder pressure Q: Is the check result normal? YES: Go to Step 11 NO: Carry out the calibration of the brake fluid pressure sensor (Refer to «G AND YAW RATE SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__g-and-yaw-rate-sensor-calibration) ). Then go to Step 12
STEP 11. Using scan tool MB991958, check the DTC the other system. Use scan tool MB991958 to check that the diagnostic trouble code is set in the TS-SST-ECU. Q: Is the diagnostic trouble code set? YES: Carry out the diagnosis for the diagnostic trouble code. (Refer to «TROUBLESHOOTING/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-trans/#twin-clutch-sportronic-shift-transmission-tc-sst-on-vehicle-service-except-lancer-evolution) ) NO: Go to Step 12.
STEP 12. Retest the system. Check if the HSA works with one occupant (driver) only in the vehicle. Q: Is the check result normal? YES: If a trouble is solved, it is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO USE TROUBLESHOOTING/HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Replace the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 13.
STEP 13. Retest the system. Check if the HSA works with one occupant (driver) only in the vehicle. Q: Is the check result normal? YES: This diagnosis is complete. NO: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to «HYDRAULIC UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 14.
STEP 14. Retest the system. Check if the HSA works with one occupant (driver) only in the vehicle. Q: Is the check result normal? YES: This diagnosis is complete. NO: Return to Step 1 .

Inspection Procedure 16: HSA (Hill Start Assist) works on a flat road

CAUTION

If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS LINE DIAGNOSTIC FLOW ). Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION and BRAKE FLUID PRESSURE SENSOR CALIBRATION ).

A failure may have occurred in the calibration or the G and yaw rate sensor.
Some drivers mistake a brake dragging for HSA operation.
If the suspension is modified, the vehicle posture changes, and the ASC-ECU judges that the vehicle is on a steep slope and may activate HSA.

Improper installation of the G and yaw rate sensor
G and yaw rate sensor malfunction
ASC-ECU malfunction
Brake drag
Damaged wiring harness and connectors

Required Special Tools

MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

STEP 1. HSA operation check Check if the HSA works on a flat road with one occupant (driver) only in the vehicle. Q: Does the HSA work on a flat road? YES: Go to Step 2 NO: This diagnosis is complete.
STEP 2. Using scan tool MB991958, check the data list Check the following data list (Refer to «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__data-list-reference-table) ). Item 09: G sensor Q: Is the check result normal? YES: Go to Step 5 . NO: Go to Step 3
STEP 3. G and yaw rate sensor installation check Check that the G and yaw rate sensor is installed correctly. Q: Is the check result normal? YES: Carry out the calibration of the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR CALIBRATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution__g-and-yaw-rate-sensor-calibration) ). Then go to Step 4 NO: Reinstall the G and yaw rate sensor correctly (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ), and then go to Step 6 .
STEP 4. Brake drag check Check the brake system for drag. Q: Is the check result normal? YES: Go to Step 5 NO: Repair the brake drag, and then go to Step 5.
STEP 5. Retest the system. Check if the HSA works on a flat road with one occupant (driver) only in the vehicle. Q: Does the HSA work on a flat road? YES: Replace the G and yaw rate sensor (Refer to «G AND YAW RATE SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ). Then go to Step 6. NO: Go to Step 6.
STEP 6. Retest the system. Check if the HSA works on a flat road with one occupant (driver) only in the vehicle. Q: Does the HSA work on a flat road? YES: Return to Step 2 . NO: This diagnosis is complete.

DATA LIST REFERENCE TABLE

The following items can be read by the scan tool from the ASC-ECU input data.

The following items of ECU input data can be read using scan tool.

The system is normal. DATA LIST REFERENCE Item No. Check item Check condition Normal condition 01 FL wheel speed sensor Perform a test run of the vehicle. The speedometer display and the scan tool display almost agree with each other. < During stop: approximately 0.4 mph (0.7km/h) > 02 FR wheel speed sensor 03 RL wheel speed sensor 04 RR wheel speed sensor 05 Power supply voltage Battery positive voltage (10 to 18 V ASC operatable range) 07 Brake switch (input) The brake pedal is depressed. ON The brake pedal is released. OFF 08 Lateral G sensor (+: left turn, -: right turn) Vehicle stopped (level) -0.11 to 0.11 G Running -1 to 1 G 09 G sensor (+: deceleration, -: acceleration) Vehicle stopped (level) -0.04 to 0.04 G Running FWD 0 G (1) (fixed value) AWD -1 to 1 G 10 Master cylinder pressure (+: pressure increase, -: pressure decrease) The brake pedal is depressed. Increases by the amount of the brake pedal depression. The brake pedal is released. -3 to 3 bar 11 Steering angle (+: left turn, -: right turn) Vehicle stopped (the steering wheel is in the neutral position) -6 to 6 deg Running Nearly the same as the steering wheel operation angle <-720 to 720 deg (ASC-ECU normal detection value)> Nearly the same as the steering wheel operation angle <-850 to 850 deg (Sensor normal value as a single unit)> 12 Yaw rate sensor (+: left turn, -: right turn) Vehicle stopped (level) -3.6 to 3.6 deg/s Running -100 to 100 deg/s 14 Brake switch The brake pedal is depressed. ON The brake pedal is released. OFF 15 Emission test mode Emission test mode: ON ON Emission test mode: OFF OFF 26 Brake fluid pressure switch Brake fluid level is lower than the "LOWER" marking. Low Brake fluid level is higher than the "LOWER" marking. Normal 28 ASC/TCL off switch When the ASC OFF switch is not operated (when the ASC control is available) ON When the ASC OFF switch is operated (pressed and held for 3 seconds or more) (when the ASC control is prohibited) OFF When the ASC OFF switch is operated (pressed and held for 15 seconds or more) (when the ASC OFF control is prohibited by fail-safe function) (2) ON 45 SAS OK flag When the steering wheel sensor neutral point is learned Comp When the steering wheel sensor neutral point is not learned Not Comp When the steering wheel sensor is defective SAS fail SAS fail&No Comp 65 Engine Speed When the accelerator pedal is depressed (engine started) The tachometer display and the scan tool display almost agree with each other. 66 Engine torque Displays the engine torque. 67 APS Displays the accelerator pedal opening angle. 68 Allow ESP torque request Permitted 70 Target gear When the selector lever is operated Displays the selector lever position. 71 Actual gear 72 Master cylinder pressure Offset The difference between the neutral position that was input to the ASC-ECU before the master cylinder pressure sensor calibration and the neutral position after the calibration. -8 to 8 bar 73 Lateral G sensor offset The difference between the neutral position that was input to the ASC-ECU before the G and yaw rate sensor calibration and the neutral position after the calibration. -0.15 to 0.15 G 86 Ignition switch Ignition switch: ON ON 87 Ignition switch (input) Ignition switch: ON ON 88 Vehicle speed Perform a test run of the vehicle. The speedometer display and the scan tool display almost agree with each other. 91 Brake pressure sensor The brake pedal is depressed. ON The brake pedal is released. OFF 96 G sensor offset The difference between the neutral positions before the calibration and after the calibration received in the ASC-ECU at G & yaw rate sensor calibration. -0.08 to 0.08 G 97 Yaw rate sensor offset The difference between the neutral position that was input to the ASC-ECU before the G and yaw rate sensor calibration and the neutral position after the calibration. -6.0 to 6.0 deg/s 105 Power supply voltage (input) Battery positive voltage (10 to 18 V ASC operatable range) 120 Parking brake switch (Input) When the parking brake lever is pulled up: ON When the parking brake lever is released: OFF 128 A.S.C./TCL off switch (input) The ASC OFF switch is pressed. ON The ASC OFF switch is not operated. OFF (1) The G and yaw rate sensor does not detect longitudinal acceleration of a vehicle, thus "0 G" is always set. (2) When the ASC OFF switch is pressed and held for 15 seconds, the ASC system returns to the ON status.
System shutdown by ECU While ASC-ECU is disabled by the diagnostic function, the scan tool displayed data is different from the actual measurement.

ACTUATOR TEST REFERENCE TABLE

Using scan tool, the following actuators can be forcibly operated

Note. ABS and ASC are operated by ASC-ECU. When ASC-ECU is disabled due to the fail-safe function, the actuator test cannot be performed. The actuator test can be performed only when the vehicle is stationary. While the actuator test is performed, the ABS warning light flashes at a rate of 2 Hz. After the actuator test has been performed, the brake warning light, ABS warning light, ASC operation display, and ASC OFF display illuminate until the ignition switch is turned to ON again or the communication between scan tool and ASC-ECU is terminated.

Actuator test specifications

Item No.	Check item	Driven component
01	FL wheel ABS drive	Solenoid valve for the corresponding channel of the hydraulic unit and pump motor (simplified inspection mode)
02	FR wheel ABS drive
03	RL wheel ABS drive
04	RR wheel ABS drive
05	FL wheel TCL drive
06	FR wheel TCL drive
07	RL wheel TCL drive
08	RR wheel TCL drive
09	Engine TCL drive	Outputs the engine torque control signal (engine torque = 0 N.m) to the engine control module (ECM) for three seconds.

ACTUATOR TEST REFERENCE CHART

Scheme 52

Scheme 52: Operation pattern of items 01 to 08

TERMINAL VOLTAGE CHECK

Connect the special tool ASC check harness (MB991997) to measure the voltage between each check connector terminal and the ground terminal (No. 16 or 47).

Scheme 53

Scheme 53: TERMINAL VOLTAGE CHECK

Terminal No.	Check item	Check condition	Normal condition
1	Motor power supply	Ignition switch: ON (OFF)	Approximately system voltage
2	ASC-ECU power supply	Ignition switch: ON	Approximately system voltage
2	ASC-ECU power supply	Ignition switch: OFF	Approximately system voltage
8	Ignition switch signal for ASC-ECU activation	Ignition switch: ON	Approximately system voltage
8	Ignition switch signal for ASC-ECU activation	Ignition switch: OFF	1 volt or less
22	G and yaw rate sensor power supply	Ignition switch: ON	Approximately system voltage
32	Solenoid valve power supply	Ignition switch: ON (OFF)	Approximately system voltage
34	Wheel speed sensor (FR) power supply	Ignition switch: ON	Approximately system voltage
36	Wheel speed sensor (RL) power supply	Ignition switch: ON	Approximately system voltage
43	Wheel speed sensor (RR) power supply	Ignition switch: ON	Approximately system voltage
45	Wheel speed sensor (FL) power supply	Ignition switch: ON	Approximately system voltage

CONNECTOR TERMINALS REFERENCE CHART

Scheme 54

Scheme 54: CONTINUITY CHECK AT WIRING HARNESS-SIDE CONNECTOR

When performing the continuity check, turn the ignition switch to LOCK (OFF) position, connect the special tool ASC check harness (MB991997) as shown in the illustration, and disconnect the ASC-ECU connector.
Check for continuity between terminals shown in the chart below.
Terminal layout is shown in the illustration. CONNECTOR TERMINALS REFERENCE CHART Terminal No. Signal Normal condition 16 - body ground Ground Continuity exists (2ohms or less) 47 - body ground Ground

SPECIAL TOOLS

SPECIAL TOOLS CHART Tool Tool number and name Supersession Application MB991958 MB991824 MB991827 MB991910 MB991911 MB991914 MB991825 MB991826 M.U.T.-III sub assembly Vehicle communication interface (V.C.I.) M.U.T.-III USB cable M.U.T.-III main harness A (Vehicles with CAN communication system) M.U.T.-III main harness B (Vehicles without CAN communication system) M.U.T.-III main harness C (for Chrysler models only) M.U.T.-III measurement adapter M.U.T.-III trigger harness MB991824-KIT NOTE: G: MB991826 M.U.T.-III Trigger Harness is not necessary when pushing V.C.I. ENTER key. CAUTION: M.U.T.-III main harness A (MB991910) should be used. M.U.T.-III main harness B and C should not be used for this vehicle. ASC check (Diagnostic trouble code display, data list display and calibration by scan tool) MB991997 ASC check harness Voltage inspection at ASC-ECU terminals MB991223 MB991219 MB991220 MB991221 MB991222 Harness set Test harness LED harness LED harness adaptor Probe General service tools Continuity check and voltage measurement at harness wire or connector for loose, corroded or damaged terminals, or terminals pushed back in the connector. Connector pin contact pressure inspection Power circuit inspection Power circuit inspection Commercial tester connection MB992006 Extra fine probe - Continuity check and voltage measurement at harness wire or connector for loose, corroded or damaged terminals, or terminals pushed back in the connector. MB991709 Wiring harness set - Output current measure at the wheel speed sensor

Scheme 55

Scheme 55: SPECIAL TOOLS

Scheme 56

Scheme 57

WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT

Required Special Tools

MB991709: Wiring harness set

The relevant wheel, on which the wheel speed sensor is fitted, should be free to run.

Scheme 58

Remove the wheel speed sensor connector to be checked. CAUTION: For precise measurement, do not connect to the wheel speed sensor-side connector and the wiring harness side connector terminal No. 1.
Use the special tool test harness (MB991709) to connect a multimeter between the wheel speed sensor-side connector and the wiring harness connector terminal No. 2.
Turn the ignition switch to the "ON" position. CAUTION: Do not rotate the wheel too quickly. Output current changes significantly as the wheel speed detection magnetic encoder comes near or goes away from the wheel speed sensor.
Rotate the wheel, on which the wheel speed sensor is fitted, quite slowly to measure the output current with the multimeter. Standard value: 5.9 to 8.4 mA or 11.8 to 16.8 mA
If the measurement is not within the standard value, or the output current does not change in proportion to the wheel rotation, replace the wheel speed sensor (Refer to «WHEEL SPEED SENSOR»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#active-stability-control-system-asc-except-lancer-evolution) ).

HYDRAULIC UNIT CHECK

Required Special Tools

MB991958: scan tool Sub Assembly MB991824: Vehicle Communication Interface (V.C.I.) MB991827: scan tool USB Cable MB991910: scan tool Main Harness A (Vehicles with CAN communication system)

Scheme 59

Raise the vehicle using a jack and support the specified points with a rigid rack. CAUTION: Before connecting or disconnecting scan tool, always turn the ignition switch to the LOCK (OFF) position.
Before setting scan tool, turn the ignition key to the LOCK (OFF) position.
Confirm that the selector lever is in the "N" position, and then start the engine.
When carrying out the actuator tests No. 01 to 04, perform the actuator tests using scan tool while depressing the brake pedal. When carrying out the actuator tests No. 05 to 08, perform the actuator tests using scan tool without depressing the brake pedal. When carrying out the actuator tests, rotate the wheel by hands to confirm that the braking force changes. NOTE: While performing the actuator test, the ABS warning light flashes at a rate of 2 Hz. When ASC-ECU is disabled due to the fail-safe function, the scan tool actuator test cannot be performed. After the actuator test has been performed, the ABS warning light, brake waning light, and ASC OFF light or ASC OFF display illuminate until the ignition switch is turned to ON again or the communication between scan tool and ASC-ECU is terminated.
This is indicated as shown in the illustration above.
When any malfunction has been found, take a necessary action according to the "Judgment Table." Judgment Table JUDGMENT REFERENCE CHART Display on scan tool Operation Test result Judgment Cause Measure 01 FL wheel ABS drive 02 FR wheel ABS drive 03 RL wheel ABS drive 04 RR wheel ABS drive Depress the brake pedal to lock the wheel. Select the vehicle to be inspected using scan tool, perform the actuator test. Rotate the selected wheel by hands to confirm the braking force. Braking force decreases for 3 seconds from the lock status. Normal - - The wheel does not lock even if the brake pedal is depressed. Error Clogged brake line other than hydraulic unit Check and clean the brake line. Clogged hydraulic circuit in the hydraulic unit Replace the hydraulic unit assembly. Braking force does not decrease. Faulty routing of hydraulic unit brake tube Route the brake tube correctly. Malfunction of hydraulic unit solenoid valve operation Replace the hydraulic unit assembly. 05 FL wheel TCL drive 06 FR wheel TCL drive 07 RL wheel TCL drive 08 RR wheel TCL drive Select the vehicle to be inspected using scan tool, perform the actuator test. Rotate the selected wheel by hands to confirm the braking force. Lock condition occurs for 3 seconds from the status without braking force. Normal - - The wheel does not lock. Error Faulty routing of hydraulic unit brake tube Clogged brake line other than hydraulic unit Check and clean the brake line. Clogged hydraulic circuit in the hydraulic unit Replace the hydraulic unit assembly.
After the inspection, turn the ignition switch to the LOCK (OFF) position, and then disconnect scan tool.

IN THE EVENT OF A DISCHARGED BATTERY

WARNING

If the ASC is not operating, the vehicle will be unstable during braking, Do not drive the vehicle with the ASC-ECU connector disconnected or with the ASC not operating.

If the engine is started using a booster cable when the battery is completely flat, and the vehicle is then driven without waiting for the battery to be recharged, the engine may misfire and it may not be possible to drive the vehicle. This is because the ASC consumes a large amount of current when carrying out its initial checks. If this happens, recharge the battery fully.

ALL SENSOR CALIBRATION (G AND YAW RATE SENSOR, STEERING WHEEL SENSOR, BRAKE FLUID PRESSURE SENSOR)

CAUTION

Before carrying out the calibration, check that the diagnostic trouble code related to the steering wheel sensor, G and yaw rate sensor, or brake fluid pressure sensor is not set.

CAUTION

When the next operation has been completed, carry out the calibration to make ASC-ECU learn the neutral point of the steering wheel sensor, G and yaw rate sensor, and brake fluid pressure sensor. ASC-ECU replacement

CAUTION

Carry out the calibration under the following conditions. The vehicle has one occupant (driver) only. Turn the steering wheel to set the wheels in the straight-ahead positions. The brake pedal is not depressed. (The stop light switch is OFF.)

Park the vehicle on a level surface. CAUTION: Before connecting or disconnecting scan tool, always turn the ignition switch to the LOCK (OFF) position.
Before setting scan tool, turn the ignition key to the LOCK (OFF) position.
Turn the ignition switch to the ON position.
Select "ABS/ASC/ASTC."
Select "Special function."
Select "Sensor calibration."
Select "all sensor calibration."
Before removing scan tool from the vehicle, turn the ignition key to the LOCK (OFF) position.

G AND YAW RATE SENSOR CALIBRATION

CAUTION

Before performing calibration, check that the G and yaw rate sensor-related diagnostic trouble code is not set.

CAUTION

After the next operation has been completed, carry out the calibration to make ASC-ECU learn the neutral position of the G and yaw rate sensor. G and yaw rate sensor replacement ASC-ECU replacement

< Vehicles without TC-SST >

Park the vehicle on a level surface. CAUTION: Before connecting or disconnecting the scan tool, turn the ignition switch to the "LOCK" (OFF) position.
Set the scan tool with the ignition "LOCK" (OFF).
Turn the ignition switch to the ON position.
Select the relevant system from the menu.
Select "ABS/ASC/ASTC/WSS" from the system lists in "System select", and press "OK" button.
Select "Special function" in "ABS/ASC/ASTC/WSS".
Select "Sensor calibration" in "Special function".
Select "G sensor calibration" from the selected item, and press "OK" button.
The screen displays "G sensor calibration: The selected command will be executed. Are you sure? Caution: Please check the execution conditions." Then press "OK" button.
"Execute: The command was executed." will be shown. Then press "OK" button.
Select "Lateral G sensor calibration" from the selected item, and press "OK" button.
The screen displays "Lateral G sensor calibration: The selected command will be executed. Are you sure? Caution: Please check execution conditions." Then press "OK" button.
"Executed: The command was executed." will be shown. Then press "OK" button.
Learning neutral point complete
Turn the ignition switch to "LOCK" (OFF) position and then disconnect the scan tool.

< Vehicles with TC-SST (when the G and yaw rate sensor is replaced) >

Carry out steps 1 to 13 of the G and yaw rate sensor calibration for vehicles without TC-SST.
Select the relevant system from the menu.
Select "ACD/AYC" from the system lists in "System select", and press "OK" button.
Select "Special function" in "ACD/AYC".
Select "Sensor calibration" in "Special function".
Select "Lateral G sensor calibration" from the selected item, and press "OK" button.
The screen displays "Lateral G sensor calibration: The selected command will be executed. Are you sure? Caution: Please check the execution conditions." Then press "OK" button.
"Execute: The command was executed." will be shown. Then press "OK" button.
Select "Longitudinal G SNS.calibration" from the selected item, and press "OK" button.
The screen displays "Longitudinal G SNS.calibration: The selected command will be executed. Are you sure? Caution: Please check execution conditions." Then press "OK" button.
"Executed: The command was executed." will be shown. Then press "OK" button.
Learning neutral point complete
Turn the ignition switch to "LOCK" (OFF) position and then disconnect the scan tool.

CAUTION

Before performing the calibration, check if the steering wheel sensor-related diagnostic trouble code is set in ASC-ECU. When the diagnostic trouble code other than C121A is set, carry out inspection according to each troubleshooting procedure.

Place the vehicle on a level surface with its road wheels in the straight ahead position. CAUTION: Before connecting or disconnecting the scan tool, turn the ignition switch to the "LOCK" (OFF) position.
Set the scan tool with the ignition at "LOCK" (OFF).
Ignition switch: ON
Select the relevant system from the menu.
Select "Steering angle sensor" from the system list in "System select", and press "OK" button.
Select "Special function" under "Steering angle sensor".
Select "SAS Calibration" under "Special function". NOTE: If the steering angle sensor neutral point has been learned, the display will show "If SAS needs re-calibration, execute SAS calibration after executing SAS initialization". If yes, press "OK" button.
As "SAS initialization" is selected under "SAS Calibration", press "OK" button. NOTE: At this time, if the steering angle sensor neutral point has been learned, the display will show "Do you want to start? Note This operation will dear DTCs". Then, press "OK" button.
The display should show "Completed." Press "OK" button.
Press the OK button.
The display should show "SAS Calibration: Do you want to start?". Then press the OK button. NOTE: Please execute after making a tire and a steering wheel straight.
The display should show "Completed." Press "OK" button.
Turn the ignition switch to "LOCK" (off) position, and then turn the ignition switch ON again.
Select the relevant system from the menu.
Select "ABS/ASC/ASTC/WSS" from the system list under "System select", and press "OK" button.
Select "Special function" under "ABS/ASC/ASTC/WSS".
Select "Sensor calibration" under "Special function".
Select "SAS calibration" under "Sensor calibration", and press "OK" button.
The screen displays "SAS calibration: The selected command will be executed. Are you sure? Caution: Confirm the execution conditions." Then press "OK" button.
"Executed: The command was executed." will be shown. Then press "OK" button.
Select "Diagnostic trouble code" under "ABS/ASC/ASTC/WSS". If the diagnostic trouble code "C2205 SAS internal failure (past trouble)" is set, clear it.
Learning neutral point complete
Turn the ignition switch to "LOCK" (OFF) position and then disconnect the scan tool.

< Vehicles with TC-SST >

CAUTION

After the next operation has been completed, carry out the following two operations: Alignment adjustment < Front > Steering wheel sensor (column switch assembly) replacement, removal, installation ASC-ECU replacement Update the neutral position stored in the steering wheel sensor. Reset the calibrated value of the steering angle stored in ASC-ECU. Reset the calibrated value of the steering angle stored in AWC-ECU < Only when the steering wheel sensor (column switch assembly) is replaced, removed, or installed >

CAUTION

< When the ASC-ECU is replaced >

Place the vehicle on a level surface with its road wheels in the straight ahead position. CAUTION: Before connecting or disconnecting the scan tool, turn the ignition switch to the "LOCK" (OFF) position.
Set the scan tool with the ignition at "LOCK" (OFF).
Ignition switch: ON
Select the relevant system from the menu.
Select "Steering angle sensor" from the system list in "System select", and press "OK" button.
Select "Special function" under "Steering angle sensor".
Select "SAS Calibration" under "Special function". NOTE: If the steering angle sensor neutral point has been learned, the display will show "If SAS needs re-calibration, execute SAS calibration after executing SAS initialization". If yes, press "OK" button.
As "SAS initialization" is selected under "SAS Calibration", press "OK" button. NOTE: At this time, if the steering angle sensor neutral point has been learned, the display will show "Do you want to start? Note This operation will dear DTCs". Then, press "OK" button.
The display should show "Completed." Press "OK" button.
Press the OK button.
The display should show "SAS Calibration: Do you want to start?". Then press the OK button. NOTE: Please execute after making a tire and a steering wheel straight.
The display should show "Completed." Press "OK" button.
Turn the ignition switch to "LOCK" (off) position, and then turn the ignition switch ON again.
Select the relevant system from the menu.
Select "ABS/ASC/ASTC/WSS" from the system list under "System select", and press "OK" button.
Select "Special function" under "ABS/ASC/ASTC/WSS".
Select "Sensor calibration" under "Special function".
Select "SAS calibration" under "Sensor calibration", and press "OK" button.
The screen displays "SAS calibration: The selected command will be executed. Are you sure? Caution: Confirm the execution conditions." Then press "OK" button.
"Executed: The command was executed." will be shown. Then press "OK" button.
Select "Diagnostic trouble code" under "ABS/ASC/ASTC/WSS". If the diagnostic trouble code "C2205 SAS internal failure (past trouble)" is set, clear it.
Learning neutral point complete
Turn the ignition switch to "LOCK" (OFF) position and then disconnect the scan tool.

< When the steering wheel sensor is replaced >

Carry out steps 1 to 21 of the steering wheel sensor calibration for when the ASC-ECU is replaced.
Select the relevant system from the menu.
Select "ACD/AYC" from the system list in "System select", and press "OK" button.
Select "Special function" under "ACD/AYC".
Select "Sensor calibration" under "Special function". NOTE: If the steering angle sensor neutral point has been learned, the display will show "If SAS needs re-calibration, execute SAS calibration after executing SAS initialization". If yes, press "OK" button.
As "SAS Calibration" is selected under "Sensor calibration", press "OK" button. NOTE: At this time, if the steering angle sensor neutral point has been learned, the display will show "Do you want to start? Note This operation will dear DTCs". Then, press "OK" button.
The display should show "Completed." Press "OK" button.
Press the OK button.
The display should show "SAS Calibration: Do you want to start?". Then press the OK button. NOTE: Please execute after making a tire and a steering wheel straight.
The display should show "Completed." Press "OK" button.
Turn the ignition switch to "LOCK" (off) position, and then turn the ignition switch ON again.
Select the relevant system from the menu.
Select "ACD/AYC" from the system list under "System select", and press "OK" button.
Select "Special function" under "ACD/AYC".
Select "Sensor calibration" under "Special function".
Select "SAS calibration" under "Sensor calibration", and press "OK" button.
The screen displays "SAS calibration: The selected command will be executed. Are you sure? Caution: Confirm the execution conditions." Then press "OK" button.
"Executed: The command was executed." will be shown. Then press "OK" button.
Select "Diagnostic trouble code" under "ACD/AYC". If the diagnostic trouble code "U1428 G and Yaw Rate Sensor Data Error (past trouble)" is set, clear it.
Learning neutral point complete
Turn the ignition switch to "LOCK" (OFF) position and then disconnect the scan tool.

BRAKE FLUID PRESSURE SENSOR CALIBRATION

CAUTION

Prior to calibration, check that no brake fluid pressure sensor- related diagnosis codes are set.

CAUTION

After the following procedure is complete, carry out calibration to let the ASC-ECU learn the neutral position of the brake fluid pressure sensor. During diagnosis according to diagnostic trouble code No. C123A ASC-ECU replacement

CAUTION

During the calibration, the brake pedal should be released (the stoplight switch should be off).

Park the vehicle on a level surface. CAUTION: Before connecting or disconnecting the scan tool, turn the ignition switch to the "LOCK" (OFF) position.
Set the scan tool with the ignition at "LOCK" (OFF).
Turn the ignition switch to the ON position.
Select the relevant system from the menu.
Select "ABS/ASC/ASTC" from the system list under "System select", and press "OK" button.
Select "Special function" under "ABS/ASC/ASTC".
Select "Sensor calibration" under "Special function".
Select "M/C pressure sensor calibration" from the selected item, and press "OK" button.
The screen displays "M/C pressure sensor calibration: The selected command will be executed. Are you sure? Caution: Please check execution conditions." Then press "OK" button.
"Executed: The command was executed." will be shown. Then press "OK" button.
Learning neutral point complete
Turn the ignition switch to "LOCK" (OFF) position and then disconnect the scan tool.

REMOVAL AND INSTALLATION

Note. Refer to INSTRUMENT PANEL ASSEMBLY FOR THE CLIP LOCATION .

Scheme 60

Scheme 60: REMOVAL AND INSTALLATION

Scheme 61

Scheme 61: ASC OFF SWITCH CONTINUITY CHECK

As shown in the illustration, connect the circuit tester to the ASC OFF switch as a single unit.
Check the continuity when the ASC OFF switch is pressed and released. CONTINUITY CHART Item When the ASC OFF switch is released (No operation status) When the ASC OFF switch is pressed Continuity between terminal No. 1 and No. 2 No continuity Continuity exists. (2 ohms or less) Continuity between terminal No. 3 and No. 4 Continuity exists. Continuity exists.

CAUTION

When the hydraulic unit (integrated with ASC-ECU) is replaced, after turning the ignition switch ON or OFF (vehicle information from ETACS-ECU is registered), always carry out the calibration of all sensors (steering wheel sensor, G and yaw rate sensor, and brake fluid pressure sensor) at one time. (Refer to ALL SENSOR CALIBRATION (G AND YAW RATE SENSOR, STEERING WHEEL SENSOR, BRAKE FLUID PRESSURE SENSOR) .)

Scheme 62

<< A >> ABS-ECU HARNESS CONNECTOR DISCONNECTION

Operate the lock lever to disconnect the ABS-ECU harness connector as shown in the illustration.

Scheme 63

Scheme 63: << B >> HYDRAULIC UNIT (ABS-ECU) REMOVAL

>> A << BRAKE TUBE CONNECTION

Install the brake pipe to the hydraulic unit as shown in the illustration.

Scheme 64

Scheme 64: >> A << BRAKE TUBE CONNECTION

From master cylinder (primary) < Marking color: Blue >
To front brake (RH) < Marking color: Orange and white >
To front brake (LH) < Marking color: Red and white >
From master cylinder (secondary) < Marking color: Yellow >
To rear brake (RH) < Marking color: Pink >
To rear brake (LH) < Marking color: White >

< FRONT >

As for removal and installation of the front wheel speed sensor, refer to WHEEL SPEED SENSOR REMOVAL AND INSTALLATION .

< REAR FWD >

As for removal and installation of the rear wheel speed sensor, refer to WHEEL SPEED SENSOR REMOVAL AND INSTALLATION .

< REAR AWD >

CAUTION

The vehicle speed detection encoder collects any metallic particle easily, because it is magnetized. Make sure that the encoder should not collect any metallic particle. Check that there is not any trouble prior to reassembling it.

Scheme 65

Note. The vehicle speed detection encoder is integrated with the rear wheel hub assembly, which is non-serviceable.

>> A << REAR WHEEL SPEED SENSOR GROMMET INSTALLATION

Install the rear wheel speed sensor grommet to the body panel snugly as shown in the illustration.

Scheme 66

Scheme 66: >> A << REAR WHEEL SPEED SENSOR GROMMET INSTALLATION

INSPECTION

Refer to WHEEL SPEED SENSOR INSPECTION .

Scheme 67

Scheme 67: REMOVAL AND INSTALLATION

Scheme 68

Scheme 68: REMOVAL AND INSTALLATION

>> A << STEERING WHEEL SENSOR/CLOCK SPRING/COLUMN SWITCH ASSEMBLY INSTALLATION

CAUTION

Be sure to remove the clock spring from the column switch and center the clock spring to prevent the damage of steering wheel sensor. If the center of the clock spring is not correctly aligned, the steering wheel may not be turned fully or the cable inside the clock spring may be broken, causing the SRS air bag to be inoperative or operated incorrectly.

Scheme 69

Scheme 70

Align the mating marks of the clock spring. < Alignment of mating marks > Turn the clock spring clockwise fully. Turn the clock spring counterclockwise approximately three and 3/4 turns to align the mating marks. Install the clock spring to the column switch. CAUTION: Always align three mating marks of the steering wheel sensor simultaneously as shown in the illustration. If these mating marks are not aligned correctly, the steering wheel sensor may be damaged.
Align three mating marks of the steering wheel sensor simultaneously as shown in the illustration. < Alignment of mating marks > Check the window for inspecting the neutral position of the steering wheel sensor. If the mating marks cannot be seen from the window, align the mating marks as shown in the illustration. Install the steering wheel sensor to the column switch assembly, maintaining the neutral position correctly. NOTE: A new steering wheel sensor has a pin for preventing the rotation of (fixing) the steering wheel sensor. After installing the column switch assembly, remove this pin. Install the column switch assembly to the vehicle, maintaining the neutral position correctly.

Active Stability Control System (asc) - Except Lancer Evolution Mitsubishi Lancer Evolution X

SERVICE SPECIFICATIONS

INTRODUCTION TO ASC DIAGNOSIS

ASC DIAGNOSTIC TROUBLE CODE DETECTION CONDITIONS

ASC DIAGNOSTIC TROUBLESHOOTING STRATEGY

ABS WARNING LIGHT, ASC WARNING/OPERATION LIGHT AND BRAKE WARNING LIGHT CHECK

Scheme 1

ON-BOARD DIAGNOSTICS

HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)

Scheme 2

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES

HOW TO READ DATA LIST

HOW TO PERFORM ACTUATOR TEST

HOW TO DIAGNOSE THE CAN BUS LINE

DIAGNOSTIC FUNCTION

CHECK OF FREEZE FRAME DATA

FAIL-SAFE FUNCTIONS

DIAGNOSTIC TROUBLE CODE CHART

Scheme 3

OPERATION

DTC SET CONDITIONS

Current trouble

Past trouble

DIAGNOSIS

Scheme 4

Scheme 5

Scheme 6

DTC C1015 Abnormality in FR wheel speed sensor circuit

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

DTC C102B Abnormality in RR wheel speed sensor circuit

Scheme 14

Scheme 15

Scheme 16

DTC C1011 Abnormality in FL wheel speed sensor signal

Scheme 17

Code No. C101C Abnormality in FR wheel speed sensor signal

Scheme 18

Scheme 19

Scheme 20

Scheme 21

DTC C1014 Mutual monitoring of FL wheel speed sensor

DTC C101F Mutual monitoring of FR wheel speed sensor

Code No. C102A: Mutual monitoring of RL wheel speed sensor

DTC C1035 Mutual monitoring of RR wheel speed sensor

DTC C1041 Abnormality in periodical signal for FL wheel speed sensor

DTC C1042 Abnormality in periodical signal for FR wheel speed sensor

DTC C1043: Abnormality in periodical signal for RL wheel speed sensor

DTC C1044 Abnormality in periodical signal for RR wheel speed sensor

DTC C1046 FL wheel speed sensor control phase time exceeded

PROBABLE CAUSES

Scheme 22

Scheme 23

DTC C1049 RR wheel speed sensor control phase time exceeded

Scheme 24

Scheme 25

Scheme 26

Scheme 27

DTC C1073 Faulty motor drive circuit

Scheme 28

Scheme 29

Scheme 30

DTC C2116 Low or high power supply voltage in pump motor

DTC C121D Abnormality in brake fluid pressure sensor circuit

DTC C121E Abnormality in brake fluid pressure sensor output signal

Scheme 31

Scheme 32

CIRCUIT OPERATION

DTC C123B: Prolonged operation of ASC

DTC C2200 Abnormality in ASC-ECU

DTC C2101 Abnormality in battery voltage (high voltage)

DTC C121C Torque request signal rejection

DTC C1290 CAN time-out error

DTC C2203 VIN not recorded

DTC C2206 Re-execution of variant coding