Electrical Power Steering - Except Lancer Evolution — Mitsubishi Lancer Evolution X (2007-2016)

GENERAL INFORMATION

The steering wheel has three spokes. All vehicles are equipped with SRS (Supplemental Restraint System).
The steering column has a shock absorbing mechanism and a tilt steering mechanism.
Improved fuel consumption by reduction of engine load, and weight saving by decrease of the number of parts have been achieved with the introduction of the electric power steering system.
Vehicle-speed sensitive electric power steering (whole range type) has been adopted. This system allows a light steering force during stationary steering maneuver or low speed driving, and a moderate steering force during medium or high speed driving.
For vehicles with this system, the electric power steering-ECU controls the motor current according to the vehicle speed and steering force of the steering wheel.
CAN* communication has been adopted in order to communicate with another ECUs for obtaining necessary information related to this control, achieving wiring harness saving and secure data communication. NOTE: *: For more information about CAN (Controller Area Network), refer to «GENERAL INFORMATION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__general-information) .

Scheme 1

Scheme 1: CONSTRUCTION DIAGRAM

SPECIFICATIONS

Item		Specification
Steering wheel	Type	3-spoke type
	Outside diameter mm (in)	375 (14.7)
	Maximum number of turns	3.09
Power steering type		Electrical powered type
Steering gear	Type	Rack and pinion type
	Stroke ratio (Rack stroke/Steering wheel maximum number of turns) mm/rev (in/rev)	46.67 (1.84)
	Rack stroke mm (in)	144 (5.7)
Motor	Type	Permanent magnetic field type
	Rated voltage V	DC 12
	Rated current Arms	79
Torque sensor	Type	Noncontact type (Magnetism detection type)
Electric power steering-ECU	Control type	Microcomputer control (32 bit)
Electric power steering-ECU	Rated voltage V	DC 12

ELECTRICAL POWER STEERING SPECIFICATIONS

Scheme 2

Scheme 2: DESCRIPTION ON SYSTEM

To improve operational reliability, the dual-circuit system has been adopted for the torque sensor. If any malfunction occurs in the electric power steering system, the fail-safe function of the electric power steering-ECU is activated, and the output current of the electric power steering-ECU applied to the motor is turned off. At the same time, the steering system enters manual mode, and informs a driver of the system malfunction by illuminating the warning light on the combination meter. The warning light illuminates when the following malfunctions occur: open circuit in the electric power steering system wiring harness, poor connection, malfunctions in the electric power steering-ECU, motor, or sensors.

ELECTRICAL PARTS AND FUNCTIONS

Parts name		Description about function
Sensor	Wheel speed sensor (ABS-ECU or ASC-ECU)	Sends the vehicle speed signal to the electric power steering-ECU.
Sensor	Torque sensor	Detects a steering force, converts it into the voltage signal, and then sends the signal to the electric power steering-ECU.
Actuator	Motor	Generates assist torque by the steering operation to the steering gear using the signals sent from the electric power steering-ECU.
	Motor angle sensor	Detects the motor angle and sends the signal to the electric power steering-ECU.
	Electric power steering warning light	Warns a driver of the system malfunction using the signal sent from the electric power steering-ECU.
Electric power steering-ECU		Control the actuator (motor) based on the signal sent from sensor.
		Controls the self-diagnostic function and fail-safe function.
		Controls diagnostic function (Compatible with scan tool).

ELECTRICAL PARTS AND FUNCTIONS

Scheme 3

Scheme 3: SYSTEM CONFIGURATION

Note. Dashed lines indicate CAN-bus lines.

Scheme 4

Scheme 4: STEERING GEAR

The torque sensor which detects a operated force of the steering wheel is installed in the steering gear. When the steering wheel is turned, the steering force is detected by the torque sensor. At the same time, 2-way supply voltage signal (main and sub) are input to the electric power steering-ECU.

Scheme 5

Scheme 5: MOTOR

The motor is installed in the steering gear. The steering motor is applied with a control current sent from the electric power steering-ECU and generates the assist torque to the steering gear according to the steering operation.

Scheme 6

Scheme 6: ELECTRIC POWER STEERING-ECU

The electric power steering-ECU is attached below the glove box, which is integrated with an input interface circuit, a microcomputer, an output drive circuit, a fail-safe relay, and a motor line relay etc. It is also integrated with a self-diagnostic function, and illuminates the warning light and sets DTC to the Data link connector.

CAN COMMUNICATION

The electric power steering-ECU performs the data transfer with another ECUs through CAN communication.

Signal	Receiver ECU
Signal	ECM	ABS-ECU or ASC-ECU	Electric power steering-ECU	Meter and A/C-ECU	ETACS-ECU
Motor current signal
Electric power steering warning light request signal

CAN COMMUNICATION SIGNAL CHART

Note. Indicates items which send and receive data through CAN communication.

FAIL-SAFE FUNCTION

If the electric power steering-ECU detects any malfunction, it illuminates the warning light, deactivates the electric power steering function, and then switches the steering system into manual mode.

DIAGNOSTIC FUNCTION

Electric power steering-ECU has the following functions for easier system checks.

DTC set
Service data output

All the above items can be diagnosed using scan tool.

DIAGNOSTIC TROUBLE CODE SET

There are 28 diagnostic items. Since all the diagnostic results are recorded in volatile memory (EEPROM*), they are stored in the memory even though the battery terminals are disconnected.

Note. *: EEPROM (Electrical Erasable & Programmable ROM) Special type of memory that can be programmed or erased electrically. For each diagnostic item, refer to the appropriate service information.

SERVICE DATA OUTPUT

Using scan tool, the input data sent from the sensors and motors can be read.

Note. For each service data item, refer to the appropriate service information.

IGNITION SWITCH ON

Ignition supply voltage is applied to the electric power steering-ECU, and the ECU enters standby mode.

Scheme 7

Scheme 7: IGNITION SWITCH ON

When the engine is started, the engine speed signal sent from the engine control module (ECM) is input to the electric power steering-ECU.
After starting the engine, the electric power steering-ECU judges the engine status "ENGINE SPEED ON" when the engine speed reaches 500 r/min, then the power assist function is ready.

Scheme 8

Scheme 8: STEERING WHEEL OPERATION

When the steering wheel is operated, the torque sensor integrated into the gear box detects the steering torque and outputs the torque sensor signal (main and sub), which varies with the steering force, to the electric power steering-ECU.
The electric power steering-ECU outputs the current in proportion to the torque sensor signal to the motor.
The motor outputs the rotational torque (assist torque) in proportion to the current intensity and assists the power steering gear.

FAIL-SAFE FUNCTION OPERATION

During the fail-safe mode, the electric power steering operates as a manual steering system.

SERVICE SPECIFICATIONS

Item		Standard value	Limit
Steering wheel free play mm (in)			30 (1.2) or less
Steering angle	Inner wheel	40° 50' ± 1° 30' (Difference between right and left wheels must be 2° 00' or less)
Steering angle	Outer wheel (reference value)	33° 50'
Tie-rod looseness mm (in)		Within ± 2.0 (0.08)
Tie rod end ball joint turning torque N.m (in-lb)		2.9 (26) or less
Stationary steering force N	Steering force	29 (6.5) or less
Stationary steering force N	Fluctuation band	5.9 (1.33) or less
Total rotational torque of pinion N.m (in-lb)	Total rotational torque	1.29 - 2.23 (11.4 . 19.7)
Total rotational torque of pinion N.m (in-lb)	Torque fluctuation	0.92 (8.1) or less
Band crimped value mm (in)		2.4 - 2.8 (0.09 - 0.11)

SERVICE SPECIFICATIONS

LUBRICANT

Item	Specified lubricant	Quantity
Bellows	Silicone grease	As required

LUBRICANT

SEALANT

Item	Specified sealant	Quantity
Tie-rod bellows outer side	3M™ AAD Part No.8663 or equivalent	As required

SEALANT

DIAGNOSIS TROUBLESHOOTING FLOW

Refer to TROUBLESHOOTING CONTENTS .

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 (Vehicles with CAN communication system) 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 9

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 (Vehicles with CAN communication system) 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" from the start-up screen.
Select "EPS" from "System List", and press the "OK" button.
Select "Diagnostic Trouble Code." to read the DTC.
If a DTC is set, it is shown.
Choose "Erase DTCs" to erase the DTC.

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 (Vehicles with CAN communication system)

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 being diagnosed. If they match, go to step 8 . If not, go to step 5.
Select "view vehicle information" button.
Enter the vehicle information and select the "OK" 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 optional equipment screen is displayed, choose the one which the vehicle is fitted with, and then select the "OK" button.

CHECK OF FREEZE FRAME DATA

The freeze frame data can be checked by using the scan tool ( HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

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.

Item No.	Item name	Data item	Unit
01	Odometer	Total driving distance after the diagnostic trouble code is generated	Km
02	Ignition cycle	Number of times the ignition switch is turned "ON" or "LOCK (OFF)" after the past failure transition	Number of counts is displayed.
04	Accumulated minute	Cumulative time for current malfunction of diagnostic trouble code	Min
06	Torque sensor (main)	Voltage of the main torque sensor when the diagnostic trouble code is generated	V
07	Torque sensor (sub)	Voltage of the sub torque sensor when the diagnostic trouble code is generated	V
08	Torque sensor (power supply)	Voltage of torque sensor power supply when the diagnostic trouble code is generated	V
11	Relay voltage	Voltage of power supply relay when the diagnostic trouble code is generated	V
12	Vehicle speed	Vehicles speed when the diagnostic trouble code is generated	Km/h

DISPLAY ITEM LIST

CHECK OF ELECTRIC POWER STEERING WARNING DISPLAY

If the display does not operate, the electric power steering system or the combination meter may be defective. Check for diagnostic trouble code, and carry out diagnosis (Refer to DIAGNOSTIC TROUBLE CODE CHART ). If no diagnostic trouble codes are set, carry out diagnosis by referring to the electric power steering warning display-related inspection items on the trouble symptom chart (Refer to TROUBLE SYMPTOM CHART ).

Scheme 10

Scheme 10: CHECK OF ELECTRIC POWER STEERING WARNING DISPLAY

DIAGNOSTIC TROUBLE CODE CHART

CAUTION

During troubleshooting, a DTC associated with other system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, check all systems for DTC(s). If DTC(s) are set, erase them all. If more than three minutes elapse after the ignition switch is turned ON without starting engine, the electric power steering-ECU may set DTCs U0100 and U0121 as past trouble.

Note. For electric power steering system the power supply may not shut off immediately after the ignition switch is turned "OFF".

DTC	Diagnostic item
C1510	Torque sensor main
C1511	Torque sensor sub
C1512	Torque sensor main/sub voltage
C1513	Torque sensor power supply
C1514	Torque sensor power supply too low
C1520	Motor turning angle (input)
C1521	Motor turning angle (output)
C1522	Motor turning angle range
C1530	Motor FET driver
C1531	Motor current too low
C1532	Motor output current too large
C1533	Motor terminal initial voltage
C1534	Motor terminal monitor voltage
C1535	Motor output current
C1536	Motor terminal voltage abnormality (high voltage)
C1540	Power supply voltage abnormality (high voltage)
C1541	Power supply voltage abnormality (low voltage)
C1550	ECU internal error
C1560	Vehicle speed data (CAN) time-out
C1561	Engine revolution data (CAN) time-out
U0001	Bus off
U0100	Engine time-out error
U0121	ABS time-out error
U0141	ETACS time-out error
U0401	Engine revolution data input malfunction
U0415	Vehicle speed (CAN message) data input malfunction
U1415	Variant coding not implemented
U1417	Variant coding value invalid (includes faulty installation)

DIAGNOSTIC TROUBLE CODE CHART

Scheme 11

Scheme 11: DTC C1510: Torque sensor main; DTC C1511: Torque sensor sub

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 DIAGNOSTIC TROUBLE CODE DIAGNOSIS ). Whenever ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION

Power is supplied to the torque sensor from the electric power steering-ECU.

FUNCTION

The voltage based on the input torque is output to the electric power steering-ECU from the torque sensor main and sub for motor control.

Check Conditions

With the torque sensor power supply ON, 5 V is supplied to the torque sensor.

Judgment Criterion

The torque sensor main output voltage or the torque sensor sub output voltage is more than 4.7 V or less than 0.3 V.
The torque sensor main output voltage or the torque sensor sub output voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the torque sensor main system or the torque sensor sub system.

Fail Safe, Back Up Function

The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTC C1510 and C1511.

PROBABLE CAUSES

Malfunction of CAN bus line
Defective torque sensor of the steering gear and linkage assembly
Defective harness wire(s) or connector(s) Short or open circuit between the electric power steering-ECU and the torque sensor or loose connector contact
Malfunction of the electric power steering-ECU

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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1510 or C1511 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Check the following connector. Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case. C-140 and C-141-1 electric power steering-ECU connector Torque sensor intermediate connector of the wiring harness for steering gear box & linkage assembly (connection and appearance checks only) Q: Is the connectors and terminals in good condition? YES: Go to Step 4. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 9 .
STEP 4. Wiring harness check Check the wiring harness between the C-141-1 electric power steering-ECU connector terminal No. 26 and the torque sensor main for damage or other problem. Check the wiring harness between the C-141-1 electric power steering-ECU connector terminal No. 24 and the torque sensor sub for damage or other problem. Q: Is the wiring harness in good condition? YES: Go to Step 5. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 9 .
STEP 5. Voltage measurement at the electric power steering-ECU connector The steering is in the neutral position. Measure the electric power steering-ECU voltage without disconnecting the connector (by backprobing). Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Measure the voltage between the C-141-1 electric power steering-ECU connector terminal No. 26 and the C-140 electric power steering-ECU connector terminal No. 12 (for main system). OK: 2.5 ± 0.05 V Measure the voltage between the C-141-1 electric power steering-ECU connector terminal No. 24 and the C-140 electric power steering-ECU connector terminal No. 12 (for sub system). OK: 2.5 ± 0.05 V Q: Is the check result normal? YES: Go to Step 6. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 9 .
STEP 6. Using scan tool MB991958, check the data list The steering is in the neutral position. Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 01: Torque sensor (main) Item No. 02: Torque sensor (sub) Q: Is the check result normal? YES: Go to Step 9 . NO: Go to Step 7.
STEP 7. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1510 or C1511 set? YES: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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) ). Then go to Step 8.
STEP 8. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1510 or C1511 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 9. 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 9. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1510 or C1511 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC C1512: Torque sensor main/sub voltage

CAUTION

Power is supplied to the torque sensor from the electric power steering-ECU.

The voltage based on the input torque is output to the electric power steering-ECU from the torque sensor main and torque sensor sub, and the sum of the torque sensor main output voltage and sub output voltage values are monitored for motor control.

With the torque sensor power supply ON, 5 V is supplied to the torque sensor.

The sum of the torque sensor main output voltage and sub output voltage is more than 5.375 V or less than 4.625 V.
The sum of the torque sensor main output voltage and sub output voltage does not meet a predetermined value stored in the microcomputer, and the microcomputer determines that a problem has occurred in the mutual monitoring for the sensor main/sub systems.

The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTC C1512.

Malfunction of CAN bus line
Defective torque sensor of the steering gear and linkage assembly
Defective harness wire(s) or connector(s) Short or open circuit between the electric power steering-ECU and the torque sensor or loose connector contact
Malfunction of the electric power steering-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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1512 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Check the following connector. Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case. C-140 and C-141-1 electric power steering-ECU connector Intermediate connector of the wiring harness for steering gear box & linkage assembly (connection and appearance checks only) Q: Is the connectors and terminals in good condition? YES: Go to Step 4. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 4. Wiring harness check Check the wiring harness between the C-141-1 electric power steering-ECU connector terminal No. 26 and the torque sensor main for damage or other problem. Check the wiring harness between the C-141-1 electric power steering-ECU connector terminal No. 24 and the torque sensor sub for damage or other problem. Q: Is the wiring harness in good condition? YES: Go to Step 5. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 5. Voltage measurement at the electric power steering-ECU connector The steering is in the neutral position. Measure the electric power steering-ECU voltage without disconnecting the connector (by backprobing). Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Measure the voltage between the C-141-1 electric power steering-ECU connector terminal No. 26 and the C-140 electric power steering-ECU connector terminal No. 12 (for main system). OK: 2.5 ± 0.05 V Measure the voltage between the C-141-1 electric power steering-ECU connector terminal No. 24 and the C-140 electric power steering-ECU connector terminal No. 12 (for sub system). OK: 2.5 ± 0.05 V Q: Is the check result normal? YES: Go to Step 6. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 6. Using scan tool MB991958, check the data list The steering is in the neutral position. Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 01: Torque sensor (main) Item No. 02: Torque sensor (sub) Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 7.
STEP 7. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1512 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1512 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC C1513: Torque sensor power supply

CAUTION

Power is supplied to the electric power steering-ECU from the torque sensor.

To output the voltage based on the input torque from the torque sensor to the electric power steering-ECU, the voltage is supplied to the torque sensor.

With the battery voltage exceeding 7.5 V, the torque sensor power supply turns ON.

The torque sensor power supply voltage is more than 5.3 V or less than 4.7 V.
The torque sensor power supply monitor voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the torque sensor power supply voltage.

The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTC C1513.

Malfunction of CAN bus line
Defective torque sensor of the steering gear and linkage assembly
Defective harness wire(s) or connector(s) Short or open circuit between the electric power steering-ECU and the torque sensor or loose connector contact Open circuit between the body ground and the electric power steering-ECU or loose connector contact
Malfunction of the electric power steering-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 (Vehicles with CAN communication system)

Scheme 14

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1513 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Check the following connector. Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case. C-140 and C-141-1 electric power steering-ECU connector Body ground point Torque sensor intermediate connector of the wiring harness for steering gear box & linkage assembly (connection and appearance checks only) Q: Is the connectors and terminals in good condition? YES: Go to Step 4. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 4. Wiring harness check Check the wiring harness between the C-141-1 electric power steering-ECU connector terminals No. 30 or No. 31 and the torque sensor for damage or other problem. Check the wiring harness between the C-140 electric power steering-ECU connector terminal No. 12 and the body ground point for damage or other problem. Q: Is the wiring harness in good condition? YES: Go to Step 5. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 5. Voltage measurement at the electric power steering-ECU connector The steering is in the neutral position. Measure the electric power steering-ECU voltage without disconnecting the connector (by backprobing). Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Measure the voltage between the C-141-1 electric power steering-ECU connector terminal No. 30 and No. 31. OK: 5 ± 0.2 V Q: Is the check result normal? YES: Go to Step 6. NO: Replace the Steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 6. Using scan tool MB991958, check the data list The steering is in the neutral position. Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 03: Torque sensor (power supply) Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 7.
STEP 7. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1513 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1513 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC C1514: Torque sensor power supply too low

CAUTION

Power is supplied to the torque sensor from the electric power steering-ECU.

To output the voltage based on the input torque from the torque sensor to the electric power steering-ECU, the voltage is supplied to the torque sensor.

Torque sensor power supply ON

The torque sensor power supply voltage is less than 2.5 V.
The torque sensor power supply monitor voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the torque sensor power supply voltage.

The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTC No. C1514.

Malfunction of CAN bus line
Defective torque sensor of the steering gear and linkage assembly
Defective harness wire(s) or connector(s) Short or open circuit between the electric power steering-ECU and the torque sensor or loose connector contact Open circuit between the body ground and the electric power steering-ECU or loose connector contact
Malfunction of the electric power steering-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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1514 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Check the following connector. Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case. C-140 and C-141-1 electric power steering-ECU connector Body ground point Torque sensor intermediate connector of the wiring harness for steering gear box & linkage assembly (connection and appearance checks only) Q: Is the connectors and terminals in good condition? YES: Go to Step 4. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 4. Wiring harness check Check the wiring harness between the C-141-1 electric power steering-ECU connector terminals No. 30 or No. 31 and the torque sensor for damage or other problem. Check the wiring harness between the C-140 electric power steering-ECU connector terminal No. 12 and the body ground point for damage or other problem. Q: Is the wiring harness in good condition? YES: Go to Step 5. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 5. Voltage measurement at the electric power steering-ECU connector The steering is in the neutral position. Measure the electric power steering-ECU voltage without disconnecting the connector (by backprobing). Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Measure the voltage between the C-141-1 electric power steering-ECU connector terminal No. 30 and No. 31. OK: 5 ± 0.2 V Q: Is the check result normal? YES: Go to Step 6. NO: Replace the Steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 6. Using scan tool MB991958, check the data list The steering is in the neutral position. Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 03: Torque sensor (power supply) Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 7.
STEP 7. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1514 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1514 set? YES: Return to Step 1 . NO: This diagnosis is complete.

Scheme 15

Scheme 15: DTC C1520: Motor turning angle (input); DTC C1521: Motor turning angle (output); DTC C1522: Motor tu

CAUTION

Power is supplied to the resolver from the electric power steering-ECU.

To output the voltage based on the motor rotation angle to the electric power steering-ECU, the voltage is supplied to the resolver.

The power supply circuit system DTC (No. C1540, C1541) is not set.

The resolver input voltage is more than 3.2 V or less than 0.4 V.
The resolver output voltage is more than 3.0 V or less than 2.0 V.
The resolver input voltage or the resolver output voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the resolver system.

The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTC C1520, C1521, and C1522.

Malfunction of CAN bus line
Defective resolver of the steering gear and linkage assembly
Defective harness wire(s) or connector(s) Short or open circuit between the electric power steering-ECU and the resolver or loose connector contact
Malfunction of the electric power steering-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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1520, C1521 or C1522 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Check the following connector. Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case. C-141-1 electric power steering-ECU connector Resolver intermediate connector of the wiring harness for steering gear box & linkage assembly (connection and appearance checks only) Q: Is the connectors and terminals in good condition? YES: Go to Step 4. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 4. Wiring harness check Check the wiring harness between the C-141-1 electric power steering-ECU connector terminals No. 21, No. 22, No. 23, No. 25, No. 27 or No. 28 and the resolver for damage or other problem. Check the wiring harness between the C-140 electric power steering-ECU connector terminal No. 12 and the body ground point for damage or other problem. Q: Is the wiring harness in good condition? YES: Go to Step 5. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 5. Using scan tool MB991958, check the data list Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 04: Motor current Item No. 05: Motor current (target) Item No. 17: Motor electric angle Item No. 18: Motor speed Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 6.
STEP 6. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1520, C1521 or C1522 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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) ). Then go to Step 7.
STEP 7. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1520, C1521 or C1522 set? YES: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1520, C1521 or C1522 set? YES: Return to Step 1 . NO: This diagnosis is complete.

Scheme 16

Scheme 16: DTC C1530: Motor FET driver; DTC C1531: Motor current too low; DTC C1532: Motor output current too l

CAUTION

Power is supplied to the motor from the electric power steering-ECU.

The voltage controlled by the torque sensor and resolver is supplied to the motor from the electric power steering-ECU.

The motor voltage is in between 0 V and the battery voltage.

The motor voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the motor system.

The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTC C1530, C1531, C1532, C1533, C1534, C1535, and C1536.

Malfunction of CAN bus line
Defective motor of the steering gear and linkage assembly
Defective harness wire(s) or connector(s) Short or open circuit between the electric power steering-ECU and the motor or loose connector contact Open circuit between the body ground and the electric power steering-ECU or loose connector contact
Malfunction of the electric power steering-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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1530, C1531, C1532, C1533, C1534, C1535 or C1536 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Check the following connector. Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case. C-140, C-141-2 and C-141-3 electric power steering-ECU connector Body ground point Q: Is the connectors and terminals in good condition? YES: Go to Step 4. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 4. Wiring harness check Check the wiring harness between the C-141-2 electric power steering-ECU connector terminals No. 41 or No. 42 and the motor for damage or other problem. Check the wiring harness between the C-141-3 electric power steering-ECU connector terminal No. 51 and the motor for damage or other problem. Check the wiring harness between the C-140 electric power steering-ECU connector terminal No. 12 and the body ground point for damage or other problem. Q: Is the wiring harness in good condition? YES: Go to Step 5. NO: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 8 .
STEP 5. Using scan tool MB991958, check the data list Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 04: Motor current Item No. 05: Motor current (target) Item No. 16: Motor current (unlimited target) Item No. 17: Motor electric angle Item No. 18: Motor speed Item No. 19: Motor voltage Item No. 25: Motor relay Item No. A12: Motor current (target) :rec.A1 Item No. A13: Motor cur. (unltd target) :rec.A1 Item No. A14: Motor current :rec.A1 Item No. A22: Motor current (target) :rec.A2 Item No. A23: Motor cur. (unltd target) :rec.A2 Item No. A24: Motor current :rec.A2 Item No. A32: Motor current (target) :rec.A3 Item No. A33: Motor cur. (unltd target) :rec.A3 Item No. A34: Motor current :rec.A3 Item No. A42: Motor current (target) :rec.A4 Item No. A43: Motor cur. (unltd target) :rec.A4 Item No. A44: Motor current :rec.A4 Item No. A52: Motor current (target) :rec.A5 Item No. A53: Motor cur. (unltd target) :rec.A5 Item No. A54: Motor current :rec.A5 Item No. B12: Power relay voltage :rec V1 Item No. B22: Power relay voltage :rec V2 Item No. B32: Power relay voltage :rec V3 Item No. B42: Power relay voltage :rec V4 Item No. B52: Power relay voltage :rec V5 Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 6.
STEP 6. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1530, C1531, C1532, C1533, C1534, C1535 or C1536 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 7. 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) ). Then go to Step 7.
STEP 7. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1530, C1531, C1532, C1533, C1534, C1535 or C1536 set? YES: Replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC C1530, C1531, C1532, C1533, C1534, C1535 or C1536 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC C1540: Power supply voltage abnormality (high voltage)

CAUTION

Power is supplied to the electric power steering-ECU from the battery or the ignition switch.

To control the steering gear and linkage assembly, the battery voltage is supplied to the electric power steering-ECU.

The power supply voltage is more than 17.5 V.
The power supply monitor voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the power supply system.

The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTC C1540.

Malfunction of CAN bus line
Defective battery
Charging system failed
Malfunction of the electric power steering-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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1540 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Check the battery voltage. Start the engine and measure the battery voltage (Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 4 NO: Check the battery and repair if necessary (Refer to «BATTERY CHARGING»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution__battery-charging) , «BATTERY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution__battery-removal-and-installation) ). Then go to Step 7 .
STEP 4. Check the charging system. Start the engine and measure the charging system (Refer to «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: Check the charging system and repair if necessary (Refer to «GENERATOR ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/charging-system/#charging-system-except-lancer-evolution) ). Then go to Step 7 .
STEP 5. Using scan tool MB991958, check the data list Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 22: Power relay voltage Item No. 23: Ignition voltage Q: Is the check result normal? YES: Go to Step 7 . NO: Go to Step 6.
STEP 6. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1540 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Then go to Step 7. 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1540 set? YES: Return to Step 1 . NO: This diagnosis is complete.

Scheme 17

Scheme 17: DTC C1541: Power supply voltage abnormality (low voltage)

CAUTION

Power is supplied to the electric power steering-ECU from the battery or the ignition switch.

To control the steering gear and linkage assembly, the battery voltage is supplied to the electric power steering-ECU for energization.

The ETACS power supply circuit system DTC is not set.

The power supply voltage is less than 9.0 V.
The power supply monitor voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the power supply system.

The electric power steering-ECU tapers the motor control and illuminates the electric power steering warning display, then sets the DTC C1541.

Malfunction of CAN bus line
Defective battery
Charging system failed
Defective harness wire(s) or connector(s) Short or open circuit between the electric power steering-ECU, the ETACS-ECU and the fusible link or loose connector contact Open circuit between the body ground and the electric power steering-ECU or loose connector contact
Malfunction of the ETACS-ECU
Malfunction of the electric power steering-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 (Vehicles with CAN communication system)

Scheme 18

Scheme 19

Scheme 20

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1541 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Check the battery voltage. Start the engine and measure the battery voltage (Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 4. NO: Check the battery and repair if necessary (Refer to «BATTERY CHARGING»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution__battery-charging) , «BATTERY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution__battery-removal-and-installation) ). Then go to Step 11 .
STEP 4. Check the charging system. Start the engine and measure the charging system (Refer to «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: Check the charging system and repair if necessary (Refer to «GENERATOR ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/charging-system/#charging-system-except-lancer-evolution) ). Then go to Step 11 .
STEP 5. Check the following connector. Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case. C-113 and C-114 electric power steering-ECU connector C-309 and C-317 ETACS-ECU connector C-128 intermediate connector No. 34 and 35 fusible link Body ground point Q: Is the connectors and terminals in good condition? YES: Go to Step 6. NO: Repair the defective connector(s) or terminal(s). Then go to Step 11 .
STEP 6. Wiring harness check Check the wiring harness between the C-140 electric power steering-ECU connector terminal No. 11 and the fusible link No. 35 for damage or other problem. Check the wiring harness between the C-141 electric power steering-ECU connector terminal No. 1, the C-128 intermediate connector terminal No. 19 and the C-317 ETACS-ECU connector terminal No. 5 for damage or other problem. Check the wiring harness between the C-309 ETACS-ECU connector terminal No. 1 and the fusible link No. 34 for damage or other problem. Check the wiring harness between the C-140 electric power steering-ECU connector terminal No. 12 and the body ground point for damage or other problem. Q: Is the wiring harness in good condition? YES: Go to Step 7. NO: Repair the defective wiring harness. Then go to Step 11 .
STEP 7. Voltage measurement at the ETACS-ECU connector Measure the ETACS-ECU voltage without disconnecting the connector (by backprobing). Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Measure the voltage between the C-309 ETACS-ECU connector terminal No. 1 and the C-317 ETACS-ECU connector terminal No. 5. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 8. NO: Check the fusible link or the ETACS-ECU and repair if necessary (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 11 .
STEP 8. Voltage measurement at the electric power steering-ECU connector Measure the electric power steering-ECU voltage without disconnecting the connector (by backprobing). Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Measure the voltage between the C-141 electric power steering-ECU connector terminal No. 1 and the C-140 electric power steering-ECU connector terminal No. 12. OK: Approximately system voltage Measure the voltage between the C-140 electric power steering-ECU connector terminals No. 11 and No. 12. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 9. NO: Check the fusible link or the ETACS-ECU and repair if necessary (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 11 .
STEP 9. Using scan tool MB991958, check the data list Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 22: Power relay voltage Item No. 23: Ignition voltage Q: Is the check result normal? YES: Go to Step 11 . NO: Go to Step 10.
STEP 10. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1541 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1541 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC C1550: ECU internal error

CAUTION

Power is supplied to the electric power steering-ECU from the battery.

The CAN bus signal from the torque sensor and resolver are sent to the electric power steering-ECU for motor control.

The system data is out of the prestored control range, and the microcomputer determines that there is an internal problem.

The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTC C1550.

Malfunction of CAN bus line
Malfunction of the electric power steering-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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1550 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Check whether the DTC is reset Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1550 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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 from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1550 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC C1560: Vehicle speed data (CAN) time-out

CAUTION

Electric power steering-ECU receives vehicle speed signal from the ABS-ECU < vehicles with ABS >, ASC-ECU < vehicles with ASC >.

The vehicle speed signal is sent to the electric power steering-ECU for motor control.

The power supply circuit system DTC C1540, C1541 is not set.
The engine circuit system DTC is not set.

The vehicle speed signal sent to the electric power steering-ECU is 0 km/h.
The vehicle speed signal is not sent to the ABS-ECU < vehicles with ABS >, ASC-ECU < vehicles with ASC >, and the microcomputer determines that there is a problem in the vehicle speed measurement system.

The electric power steering-ECU illuminates the electric power steering warning display, and sets the DTC No. C1560 to limit assist operation.

Malfunction of CAN bus line
Malfunction of the electric power steering-ECU
Malfunction of the engine control module (ECM)

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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1560 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Using scan tool MB991958, check the data list Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 08: Vehicle speed Q: Is the check result normal? YES: Go to Step 5 . NO: Perform troubleshooting for ABS-ECU (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#anti-lock-braking-system-abs-except-lancer-evolution__diagnostic-trouble-code-chart) < vehicles with ABS >), ASC-ECU (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) < vehicles with ASC >). Then go to Step 4.
STEP 4. Check whether the DTC is reset Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1560 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC C1560 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC C1561: Engine revolution data (CAN) time-out

CAUTION

Electric power steering-ECU receives engine revolution signal from the engine control module (ECM).

The engine speed signal is sent to the electric power steering-ECU for motor control.

The power supply circuit system DTC C1540, C1541 is not set.
The engine circuit system DTC is not set.

The engine speed signal sent to the EPS-ECU is 0 r/min.
The engine speed signal is not sent from the engine control module (ECM), and the microcomputer determines that there is a problem in the engine speed measurement system.

The electric power steering-ECU illuminates the electric power steering warning display, and sets the DTC No. C1561. Normally the assist operation is continued while the vehicle is driven, but deactivated after the vehicle stopped.

Malfunction of CAN bus line
Malfunction of the electric power steering-ECU
Malfunction of the engine control module (ECM)

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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the LOCK (OFF) position to the ON position. Check if the DTC is set. Q: Is the DTC C1561 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Using scan tool MB991958, check the data list Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 07: Engine speed Q: Is the check result normal? YES: Go to Step 5 . NO: Perform troubleshooting for engine control module (ECM) (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-non-turbo-except-lancer-evolution) ). Then go to Step 4.
STEP 4. Check whether the DTC is reset Erase the DTC. Turn the ignition switch from the LOCK (OFF) position to the ON position. Check if the DTC is set. Q: Is the DTC C1561 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the LOCK (OFF) position to the ON position. Check if the DTC is set. Q: Is the DTC C1561 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC U0001: Bus off

CAUTION

Signals from the ECUs communicate with the electric power steering-ECU.

The signals from the ECUs communicate with the electric power steering-ECU for motor control.

IG1 voltage: 10 V or more

The signals from the ECUs cannot communicate (bus off), and the microcomputer determines that there is a problem in the system.

The electric power steering-ECU illuminates the electric power steering warning display, and sets the DTC U0001 to limit assist operation.

Malfunction of CAN bus line
Malfunction of the electric power steering-ECU
Malfunction of the engine control module (ECM)
Malfunction of the ETACS-ECU
Malfunction of the ABS-ECU < vehicles with ABS >
Malfunction of the ASC-ECU < vehicles with ASC >

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 (Vehicles with CAN communication system)

STEP 1. M.U.T.-III CAN bus diagnostics 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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U0001 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Check whether the DTC is reset Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U0001 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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 from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U0001 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC U0100: Engine time-out error; DTC U0121: ABS time-out error; DTC U0141: ETACS time-out error

CAUTION

The signals from the engine control module (ECM), ABS-ECU < vehicles with ABS >, ASC-ECU < vehicles with ASC >, and ETACS-ECU are sent to the electric power steering-ECU.

The signals from the engine control module (ECM), ABS-ECU < vehicles with ABS >, ASC-ECU < vehicles with ASC >, and ETACS-ECU are sent to the electric power steering-ECU for motor control.

The power supply circuit system DTC C1540, C1541 is not set.
The DTC related to engine circuit system, ABS circuit system < vehicles with ABS >, ASC circuit system < vehicles with ASC >, and ETACS circuit system is set.

The signal from the engine control module (ECM) is not received for 55 seconds.
The signal from the ABS-ECU < vehicles with ABS >, ASC-ECU < vehicles with ASC >, and engine control module (ECM) cannot be received for 11 seconds.
The signals from the engine control module (ECM), ABS-ECU < vehicles with ABS >, ASC-ECU < vehicles with ASC >, and ETACS-ECU are not sent, and the microcomputer determines that there is a problem in the system.

The electric power steering-ECU illuminates the electric power steering warning display, and sets the DTC U0100, U0121, and U0141. However, the assist operation is limited only with the DTC U0121.

Malfunction of CAN bus line
Malfunction of the electric power steering-ECU
Malfunction of the engine control module (ECM)
Malfunction of the ETACS-ECU
Malfunction of the ABS-ECU < vehicles with ABS >
Malfunction of the ASC-ECU < vehicles with ASC >

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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC U0100, U0121 or U0141 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Using scan tool MB991958, check the DTC Use scan tool MB991958 to check if the same DTC (time-out) is set in the other ECU (CAN-C). Q: Is any DTC set? YES (Code No. U0100 is set): Replace the engine ECU, and then go to Step 4. YES (Code No. U0121 is set): Replace the hydraulic unit (integrated with ABS-ECU) < vehicles with ABS >, hydraulic unit (integrated with ASC-ECU) < vehicles with ASC >, and then go to Step 4. YES (Code No. U0141 is set): Replace the ETACS-ECU, and then go to Step 4. NO (No DTC is set.): Go to Step 4.
STEP 4. Check whether the DTC is reset Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC U0100, U0121 or U0141 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is DTC U0100, U0121 or U0141 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC U0401: Engine revolution data input malfunction

CAUTION

Electric power steering-ECU receives engine revolution signal from the engine control module (ECM).

The engine speed signal is sent to the electric power steering-ECU for motor control.

The power supply circuit system DTC C1540, C1541 is not set.
The engine circuit system DTC is not set.

Abnormal engine speed signal sent to the electric power steering-ECU is received once or more.
The abnormal engine speed signal is sent from the engine control module (ECM), and the microcomputer determines that there is a problem in the engine speed measurement system.

The electric power steering-ECU illuminates the electric power steering warning display, and sets the DTC U0401. Normally the assist operation is continued while the vehicle is driven, but deactivated after the vehicle stopped.

Malfunction of CAN bus line
Malfunction of the electric power steering-ECU
Malfunction of the engine control module (ECM)

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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U0401 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Using scan tool MB991958, check the data list Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 07: Engine speed Q: Is the check result normal? YES: Go to Step 5 . NO: Perform troubleshooting for engine control module (ECM) (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-20l-non-turbo-except-lancer-evolution) ). Then go to Step 4.
STEP 4. Check whether the DTC is reset Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U0401 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U0401 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC U0415: Vehicle speed (CAN message) data input malfunction

CAUTION

Electric power steering-ECU receives vehicle speed signal from the ABS-ECU < vehicles with ABS >, ASC-ECU < vehicles with ASC >.

The vehicle speed signal is sent to the electric power steering-ECU for motor control.

The power supply circuit system DTC C1540, C1541 is not set.
The DTC related to ABS circuit system < vehicles with ABS > and ASC circuit system < vehicles with ASC > is not set.
The engine circuit system DTC is not set.

Abnormal vehicle speed signal sent to the electric power steering-ECU is received once or more.
Abnormal vehicle speed signals are sent from the ABS-ECU < vehicles with ABS >, ASC-ECU < vehicles with ASC >, and engine control module (ECM), and the microcomputer determines that there is a problem in the vehicle speed measurement system.

The electric power steering-ECU illuminates the electric power steering warning display, and sets the DTC U0415 to limit assist operation.

Malfunction of CAN bus line
Malfunction of the electric power steering-ECU
Malfunction of the engine control module (ECM)
Malfunction of the ABS-ECU < vehicles with ABS >
Malfunction of the ASC-ECU < vehicles with ASC >

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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U0415 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Using scan tool MB991958, check the data list Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. 08: Vehicle speed Q: Is the check result normal? YES: Go to Step 5 . NO: Perform troubleshooting for ABS-ECU (Refer to «ABS DIAGNOSIS/DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/anti-locktraction-control/#anti-lock-braking-system-abs-except-lancer-evolution__diagnostic-trouble-code-chart) < vehicles with ABS >), ASC-ECU (Refer to «DIAGNOSIS/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) < vehicles with ASC >). Then go to Step 4.
STEP 4. Check whether the DTC is reset Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U0415 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U0415 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC U1415: Variant coding not implemented

CAUTION

Electric power steering-ECU receives variant coding data from the ETACS-ECU.

The coding data is sent to the electric power steering-ECU for motor control.

The power supply circuit system DTC C1540, C1541 is not set.
The ETACS circuit system DTC is not set.

The electric power steering-ECU coding is not completed.
The coding data is not sent from the ETACS-ECU, and the microcomputer determines that there is a problem in the system.

The electric power steering-ECU stops the motor control and illuminates the EPS warning display, then sets the DTC U1415.

Malfunction of CAN bus line
Malfunction of the electric power steering-ECU
Malfunction of the 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 (Vehicles with CAN communication system)

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 any DTC set? YES: Troubleshoot the relevant DTC, and then go to Step 4 . NO: Go to Step 3.
STEP 3. DTC recheck after resetting CAN bus lines Erase the DTC. Turn the ignition switch from "LOCK" (OFF) to "ON" and hold it for 1 minute, and turn it from ON to "LOCK" (OFF) and hold it for 1 minute. Then, turn the ignition switch from "LOCK" (OFF) to "ON". Check if the DTC is set. Q: Is the DTC U1415 set? YES: Go to Step 4. NO: This diagnosis is complete.
STEP 4. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U1415 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U1415 set? YES: Return to Step 1 . NO: This diagnosis is complete.

DTC U1417: Variant coding value invalid (includes faulty installation)

CAUTION

Electric power steering-ECU receives variant coding data from the ETACS-ECU.

The coding data is sent to the electric power steering-ECU for motor control.

The power supply circuit system DTC C1540, C1541 is not set.
The ETACS circuit system DTC is not set.

The coding data from the ETACS-ECU are not matched twice consecutively.
The abnormal coding data is sent from the ETACS-ECU, and the microcomputer determines that there is a problem in the system.

The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTC U1417.

Malfunction of CAN bus line
Malfunction of the electric power steering-ECU
Malfunction of the ETACS-ECU
Improperly installed electric power steering-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 (Vehicles with CAN communication system)

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 Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U1417 set? YES: Go to Step 3. NO: This diagnosis is complete.
STEP 3. Using scan tool MB991958, other system diagnostic trouble code Use scan tool to check whether the ETACS-ECU-related or engine ECU-related DTC is set or not. Q: Is any DTC set? YES: Troubleshoot for the relevant DTC. NO: Go to Step 4.
STEP 4. Check whether the DTC is reset. Erase the DTC. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U1417 set? YES: Replace the electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). 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. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Check if the DTC is set. Q: Is the DTC U1417 set? YES: Return to Step 1 . NO: This diagnosis is complete.

TROUBLE SYMPTOM CHART

CAUTION

During troubleshooting, a DTC associated with another 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	Reference or action
Scan tool cannot communicate with electric power steering system < ECU power supply circuit system check >.	1	INSPECTION PROCEDURE 1: SCAN TOOL CANNOT COMMUNICATE WITH ELECTRIC POWER STEERING SYSTEM < ECU POWER SUPPLY CIRCUIT SYSTEM CHECK >.
Electric power steering system warning display illuminates but diagnostic trouble code is not stored.	2	INSPECTION PROCEDURE 2: ELECTRIC POWER STEERING SYSTEM WARNING DISPLAY ILLUMINATES BUT DIAGNOSTIC TROUBLE CODE IS NOT STORED.
The steering has become heavy, but the electric power steering warning display does not illuminate (This is normal, because the electric power steering is limiting assist operation). NOTE: If the vehicle is driven under heavy load (e.g. consecutively turning the steering to full lock or severe cornering), the electric power steering motor drive circuit will become hot. In this case, the electric power steering system will limit assist operation by decreasing the motor current to avoid damage. In this case, the steering will become heavy, but the electric power steering warning lamp does not illuminate. If the circuit temperature reduces after a while, the assist operation will return to the normal level.		Reproduce the steering operation, which your customer did. Check the M.U.T.-III data list item to No. A55 from No. A11, and confirm that the electric power steering system limited the assist operation (Refer to DATA LIST REFERENCE TABLE ). Note that this is not a failure.
The steering has become heavy, but the electric power steering warning display does not illuminate (Power supply voltage assist fall). NOTE: If the system voltage is lower than the rated value, motor rated output does not come out.	3	INSPECTION PROCEDURE 3: THE STEERING HAS BECOME HEAVY, BUT ELECTRIC POWER STEERING WARNING DISPLAY DOES NOT ILLUMINATE. (POWER SUPPLY VOLTAGE ASSIST FALL)

NOTE
If the vehicle is driven under heavy load (e.g. consecutively turning the steering to full lock or severe cornering), the electric power steering motor drive circuit will become hot. In this case, the electric power steering system will limit assist operation by decreasing the motor current to avoid damage. In this case, the steering will become heavy, but the electric power steering warning lamp does not illuminate. If the circuit temperature reduces after a while, the assist operation will return to the normal level.

NOTE

If the vehicle is driven under heavy load (e.g. consecutively turning the steering to full lock or severe cornering), the electric power steering motor drive circuit will become hot. In this case, the electric power steering system will limit assist operation by decreasing the motor current to avoid damage. In this case, the steering will become heavy, but the electric power steering warning lamp does not illuminate. If the circuit temperature reduces after a while, the assist operation will return to the normal level.

NOTE
If the system voltage is lower than the rated value, motor rated output does not come out.

TROUBLE SYMPTOM CHART

COMMENTS ON TROUBLE SYMPTOM

If the scan tool cannot communicate with the electric power steering system, the CAN bus lines may be defective. If the electric power steering system does not operate, the electric power steering-ECU or its power supply may be defective.

Malfunction of CAN bus line
Defective harness wire(s) or connector(s) Short or open circuit between the electric power steering-ECU and the ETACS-ECU, the fusible link or loose connector contact Open circuit between the body ground and the electric power steering-ECU or loose connector contact
Malfunction of the ETACS-ECU
Malfunction of the electric power steering-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 (Vehicles with CAN communication system)

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. Check the following connector. Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case. C-140 and C-141 electric power steering-ECU connector C-309 and C-317 ETACS-ECU connector C-128 intermediate connector No. 34 and 35 fusible link Body ground point Q: Is the connectors and terminals in good condition? YES: Go to Step 3. NO: Repair the defective connector(s) or terminal(s).
STEP 3. Wiring harness check Check the wiring harness between the C-140 electric power steering-ECU connector terminal No. 11 and the fusible link No. 35 for damage or other problem. Check the wiring harness between the C-141 electric power steering-ECU connector terminal No. 1, the C-128 intermediate connector terminal No. 19 and the C-317 ETACS-ECU connector terminal No. 5 for damage or other problem. Check the wiring harness between the C-309 ETACS-ECU connector terminal No. 1 and the fusible link No. 34 for damage or other problem. Check the wiring harness between the C-140 electric power steering-ECU connector terminal No. 12 and the body ground point for damage or other problem. Q: Is the wiring harness in good condition? YES: Go to step 4. NO: Repair the defective wiring harness.
STEP 4. Voltage measurement at the ETACS-ECU connector Measure the ETACS-ECU voltage without disconnecting the connector (by backprobing). Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Measure the voltage between the C-309 ETACS-ECU connector terminal No. 1 and the C-317 ETACS-ECU connector terminal No. 5. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 5. NO: Check the fusible link or the ETACS-ECU and repair if necessary (Refer to «ETACS-ECU»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ).
STEP 5. Voltage measurement at the electric power steering-ECU connector Measure the electric power steering-ECU voltage without disconnecting the connector (by backprobing). Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Measure the voltage between the C-141 electric power steering-ECU connector terminal No. 1 and the C-140 electric power steering-ECU connector terminal No. 12. OK: Approximately system voltage Measure the voltage between the C-140 electric power steering-ECU connector terminals No. 11 and No. 12. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 6 NO: Check the fusible link or the ETACS-ECU and repair if necessary (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. Retest the system 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 electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ).

Scheme 21

Scheme 21: Inspection Procedure 2: Electric power steering system warning display illuminates but diagnostic tr

The CAN bus lines may be defective. If the electric power steering system does not operate, the combination meter or the electric power steering-ECU may be defective.

Malfunction of CAN bus line
Defective harness wire(s) or connector(s) Short or open circuit between the electric power steering-ECU and the ETACS-ECU, the fusible link or loose connector contact Open circuit between the body ground and the electric power steering-ECU or loose connector contact
Malfunction of the ETACS-ECU
Malfunction of the combination meter
Malfunction of the electric power steering-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. Check the following connector. Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case. C-140 and C-141 electric power steering-ECU connector C-309 and C-317 ETACS-ECU connector C-128 intermediate connector No. 34 and 35 fusible link Body ground point Q: Is the connectors and terminals in good condition? YES: Go to Step 3. NO: Repair the defective connector(s) or terminal(s).
STEP 3. Wiring harness check Check the wiring harness between the C-140 electric power steering-ECU connector terminal No. 11 and the fusible link No. 35 for damage or other problem. Check the wiring harness between the C-141 electric power steering-ECU connector terminal No. 1, the C-128 intermediate connector terminal No. 19 and the C-317 ETACS-ECU connector terminal No. 5 for damage or other problem. Check the wiring harness between the C-309 ETACS-ECU connector terminal No. 1 and the fusible link No. 34 for damage or other problem. Check the wiring harness between the C-140 electric power steering-ECU connector terminal No. 12 and the body ground point for damage or other problem. Q: Is the wiring harness in good condition? YES: Go to step 4. NO: Repair the defective wiring harness.
STEP 4. Voltage measurement at the ETACS-ECU connector Measure the ETACS-ECU voltage without disconnecting the connector (by backprobing). Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Measure the voltage between the C-309 ETACS-ECU connector terminal No. 1 and the C-317 ETACS-ECU connector terminal No. 5. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 5. NO: Check the fusible link or the ETACS-ECU and repair if necessary (Refer to «ETACS-ECU»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution) ).
STEP 5. Voltage measurement at the electric power steering-ECU connector Measure the electric power steering-ECU voltage without disconnecting the connector (by backprobing). Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. Measure the voltage between the C-141 electric power steering-ECU connector terminal No. 1 and the C-140 electric power steering-ECU connector terminal No. 12. OK: Approximately system voltage Measure the voltage between the C-140 electric power steering-ECU connector terminals No. 11 and No. 12. OK: Approximately system voltage Q: Is the check result normal? YES: Go to Step 6 NO: Check the fusible link or the ETACS-ECU and repair if necessary (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. Retest the system 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 electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ).

Intermittent failure may be present in the power supply system. Check the battery and the generator to confirm that normal direct voltage flows.

Malfunction of CAN bus line
Defective battery
Charging system failed
Malfunction of the electric power steering-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 (Vehicles with CAN communication system)

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, check the data list Check the following data list «DATA LIST REFERENCE TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__data-list-reference-table) . Item No. B11: Odometer :rec.V1 Item No. B12: Power relay voltage :rec V1 Item No. B13: Vehicle speed :rec.V1 Item No. B21: Odometer :rec.V2 Item No. B22: Power relay voltage :rec V2 Item No. B23: Vehicle speed :rec.V2 Item No. B31: Odometer :rec.V3 Item No. B32: Power relay voltage :rec V3 Item No. B33: Vehicle speed :rec.V3 Item No. B41: Odometer :rec.V4 Item No. B42: Power relay voltage :rec V4 Item No. B43: Vehicle speed :rec.V4 Item No. B51: Odometer :rec.V5 Item No. B52: Power relay voltage :rec V5 Item No. B53: Vehicle speed :rec.V5 Q: Is the check result normal? YES: Go to Step 3. NO: Check the combination meter and repair if necessary (Refer to «COMBINATION METER»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution) ). Then go to Step 5 .
STEP 3. Check the battery voltage. Start the engine and measure the battery voltage (Refer to «BATTERY TEST»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution) ). Q: Is the check result normal? YES: Go to Step 4. NO: Check the battery and repair if necessary (Refer to «BATTERY CHARGING»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution__battery-charging) , «BATTERY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#battery-except-lancer-evolution__battery-removal-and-installation) ).
STEP 4. Check the charging system. Start the engine and measure the charging system (Refer to «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: Check the charging system and repair if necessary (Refer to «GENERATOR ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/charging-system/#charging-system-except-lancer-evolution) ).
STEP 5. Retest the system 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 electric power steering-ECU (Refer to «ELECTRIC POWER STEERING CONTROL UNIT»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ).

DATA LIST REFERENCE TABLE

Note. Some items are not displayed on scan tool MB991958 according to the information in the ECU.

When the system is normal.

Item No.	Check item	Check condition		Normal condition
01	Torque sensor (main)	Start the engine. Turn the steering wheel with a vehicle stationary.	Center position	Approximately 2.5 V
			Steering wheel turned to right	2.5 - 4.7 V
			Steering wheel turned to left	0.3 - 2.5 V
02	Torque sensor (sub)	Start the engine. Turn the steering wheel with a vehicle stationary.	Center position	Approximately 2.5 V
			Steering wheel turned to right	2.5 - 0.3 V
			Steering wheel turned to left	4.7 - 2.5 V
03	Torque sensor (power supply)	Start the engine.		4.7 - 5.3 V
04	Motor current	Start the engine. Turn the steering wheel to the left and right with a vehicle stationary.		Approximately 79 Arms or less (When the steering wheel is not operated, battery voltage)
05	Motor current (target)	Start the engine. Turn the steering wheel to the left and right with a vehicle stationary.		Approximately 79 Arms or less (When the steering wheel is not operated, battery voltage)
07	Engine speed	Start the engine. Turn the steering wheel to the left and right with a vehicle stationary.		Tachometer displayed value and scan tool displayed value agree with each other.
08	Vehicle speed	Start the engine. Turn the steering wheel to the left and right with a vehicle stationary.		Speed meter displayed value and scan tool displayed value agree with each other.
11	Ignition switch	Ignition switch: LOCK (OFF)		CAN communication error
11	Ignition switch	Ignition switch: ON		ON
16	Motor current (unlimited target)	Start the engine. Turn the steering wheel to the left and right with a vehicle stationary.		Approximately 79 Arms or less
17	Motor electric angle	Start the engine. Turn the steering wheel to the left and right with a vehicle stationary.		0 - 360 deg
17	Motor electric angle			Motor angle
18	Motor speed	Start the engine. Turn the steering wheel to the left and right with a vehicle stationary.		Rated value: 1130 RPM (neutral: 0 RPM)
19	Motor voltage	Start the engine.		Voltage between the motor terminals: rated value 12 V)
22	Power relay voltage	Ignition switch: ON		FFh
22	Power relay voltage	Start the engine.		Battery voltage
23	Ignition voltage	Ignition switch: ON		Battery voltage
24	Power relay	Ignition switch: ON		OFF
24	Power relay	Start the engine.		ON
25	Motor relay	Ignition switch: ON		OFF
25	Motor relay	Start the engine.		ON
A11	Odometer :rec.A1	Assist limitation does not occur.		FFh
A11	Odometer :rec.A1	Assist limitation occurs.		Odometer value
A12	Motor current (target) :rec.A1	Assist limitation does not occur.		FFh
A12	Motor current (target) :rec.A1	Assist limitation occurs.		Current value: 79 Arms or less
A13	Motor cur. (unltd target) :rec.A1	Assist limitation does not occur.		FFh
A13	Motor cur. (unltd target) :rec.A1	Assist limitation occurs.		Current value (before the assist limitation)
A14	Motor current :rec.A1	Assist limitation does not occur.		FFh
A14	Motor current :rec.A1	Assist limitation occurs.		Actual current value
A15	Vehicle speed :rec.A1	Assist limitation does not occur.		FFh
A15	Vehicle speed :rec.A1	Assist limitation occurs.		CAN vehicle speed
A21	Odometer :rec.A2	Assist limitation does not occur.		FFh
A21	Odometer :rec.A2	Assist limitation occurs.		Odometer value
A22	Motor current (target) :rec.A2	Assist limitation does not occur.		FFh
A22	Motor current (target) :rec.A2	Assist limitation occurs.		Current value: 79 Arms or less
A23	Motor cur. (unltd target) :rec.A2	Assist limitation does not occur.		FFh
A23	Motor cur. (unltd target) :rec.A2	Assist limitation occurs.		Current value (before the assist limitation)
A24	Motor current :rec.A2	Assist limitation does not occur.		FFh
A24	Motor current :rec.A2	Assist limitation occurs.		Actual current value
A25	Vehicle speed :rec.A2	Assist limitation does not occur.		FFh
A25	Vehicle speed :rec.A2	Assist limitation occurs.		CAN vehicle speed
A31	Odometer :rec.A3	Assist limitation does not occur.		FFh
A31	Odometer :rec.A3	Assist limitation occurs.		Odometer value
A32	Motor current (target) :rec.A3	Assist limitation does not occur.		FFh
A32	Motor current (target) :rec.A3	Assist limitation occurs.		Current value: 79 Arms or less
A33	Motor cur. (unltd target) :rec.A3	Assist limitation does not occur.		FFh
A33	Motor cur. (unltd target) :rec.A3	Assist limitation occurs.		Current value (before the assist limitation)
A34	Motor current :rec.A3	Assist limitation does not occur.		FFh
A34	Motor current :rec.A3	Assist limitation occurs.		Actual current value
A35	Vehicle speed :rec.A3	Assist limitation does not occur.		FFh
A35	Vehicle speed :rec.A3	Assist limitation occurs.		CAN vehicle speed
A41	Odometer :rec.A4	Assist limitation does not occur.		FFh
A41	Odometer :rec.A4	Assist limitation occurs.		Odometer value
A42	Motor current (target) :rec.A4	Assist limitation does not occur.		FFh
A42	Motor current (target) :rec.A4	Assist limitation occurs.		Current value: 79 Arms or less
A43	Motor cur. (unltd target) :rec.A4	Assist limitation does not occur.		FFh
A43	Motor cur. (unltd target) :rec.A4	Assist limitation occurs.		Current value (before the assist limitation)
A44	Motor current :rec.A4	Assist limitation does not occur.		FFh
A44	Motor current :rec.A4	Assist limitation occurs.		Actual current value
A45	Vehicle speed :rec.A4	Assist limitation does not occur.		FFh
A45	Vehicle speed :rec.A4	Assist limitation occurs.		CAN vehicle speed
A51	Odometer :rec.A5	Assist limitation does not occur.		FFh
A51	Odometer :rec.A5	Assist limitation occurs.		Odometer value
A52	Motor current (target) :rec.A5	Assist limitation does not occur.		FFh
A52	Motor current (target) :rec.A5	Assist limitation occurs.		Current value: 79 Arms or less
A53	Motor cur. (unltd target) :rec.A5	Assist limitation does not occur.		FFh
A53	Motor cur. (unltd target) :rec.A5	Assist limitation occurs.		Current value (before the assist limitation)
A54	Motor current :rec.A5	Assist limitation does not occur.		FFh
A54	Motor current :rec.A5	Assist limitation occurs.		Actual current value
A55	Vehicle speed :rec.A5	Assist limitation does not occur.		FFh
A55	Vehicle speed :rec.A5	Assist limitation occurs.		CAN vehicle speed
B11	Odometer :rec.V1	Battery voltage down does not occur.		FFh
B11	Odometer :rec.V1	Battery voltage down occurs.		Odometer value when battery voltage down occurs.
B12	Power relay voltage :rec V1	Battery voltage down does not occur.		FFh
B12	Power relay voltage :rec V1	Battery voltage down occurs.		Relay contact voltage
B13	Vehicle speed :rec.V1	Battery voltage down does not occur.		FFh
B13	Vehicle speed :rec.V1	Battery voltage down occurs.		Vehicle speed when battery voltage down occurs.
B21	Odometer :rec.V2	Battery voltage down does not occur.		FFh
B21	Odometer :rec.V2	Battery voltage down occurs.		Odometer value when battery voltage down occurs.
B22	Power relay voltage :rec V2	Battery voltage down does not occur.		FFh
B22	Power relay voltage :rec V2	Battery voltage down occurs.		Relay contact voltage
B23	Vehicle speed :rec.V2	Battery voltage down does not occur.		FFh
B23	Vehicle speed :rec.V2	Battery voltage down occurs.		Vehicle speed when battery voltage down occurs.
B31	Odometer :rec.V3	Battery voltage down does not occur.		FFh
B31	Odometer :rec.V3	Battery voltage down occurs.		Odometer value when battery voltage down occurs.
B32	Power relay voltage :rec V3	Battery voltage down does not occur.		FFh
B32	Power relay voltage :rec V3	Battery voltage down occurs.		Relay contact voltage
B33	Vehicle speed :rec.V3	Battery voltage down does not occur.		FFh
B33	Vehicle speed :rec.V3	Battery voltage down occurs.		Vehicle speed when battery voltage down occurs.
B41	Odometer :rec.V4	Battery voltage down does not occur.		FFh
B41	Odometer :rec.V4	Battery voltage down occurs.		Odometer value when battery voltage down occurs.
B42	Power relay voltage :rec V4	Battery voltage down does not occur.		FFh
B42	Power relay voltage :rec V4	Battery voltage down occurs.		Relay contact voltage
B43	Vehicle speed :rec.V4	Battery voltage down does not occur.		FFh
B43	Vehicle speed :rec.V4	Battery voltage down occurs.		Vehicle speed when battery voltage down occurs.
B51	Odometer :rec.V5	Battery voltage down does not occur.		FFh
B51	Odometer :rec.V5	Battery voltage down occurs.		Odometer value when battery voltage down occurs.
B52	Power relay voltage :rec V5	Battery voltage down does not occur.		FFh
B52	Power relay voltage :rec V5	Battery voltage down occurs.		Relay contact voltage
B53	Vehicle speed :rec.V5	Battery voltage down does not occur.		FFh
B53	Vehicle speed :rec.V5	Battery voltage down occurs.		Vehicle speed when battery voltage down occurs.

DATA LIST REFERENCE

When the electric power steering-ECU shut off electric power steering system operation.

When the diagnosis system stops the electric power steering-ECU, the scan tool display data will be unreliable.

ACTUATOR TEST REFERENCE TABLE

The scan tool activates the following actuators for testing.

Note. If the electric power steering-ECU runs down, actuator testing cannot be carried out.

Note. Actuator testing is only possible when the vehicle is stationary.

No.	Check item	Driven component
10	Input vehicle speed	Steering assist control

ACTUATOR TEST REFERENCE

Scheme 22

Scheme 22: CHECK AT ELECTRIC POWER STEERING-ECU

Terminal No.	Check item	Checking requirement	Normal condition
11	Battery power supply	Always	Approximately system voltage
12	Ground	Always	1 V or less

CONNECTOR C-140 TERMINALS VOLTAGE REFERENCE CHART

Terminal No.	Check item	Checking requirement	Normal condition
1	Ignition key signal	Ignition switch: ON	Approximately system voltage
1	Ignition key signal	Ignition switch: OFF	1 V or less
2
3	CAN_L
4	CAN_H

CONNECTOR C-141 TERMINALS VOLTAGE REFERENCE CHART

Terminal No.	Check item	Checking requirement	Normal condition
21	S1+(Cosine+)	Start the engine.	2 V or less
22	S3-(Cosine-)	Start the engine.	2 V or less
23	S2+(Sine+)	Start the engine.	2 V or less
24	Torque sensor sub signal	Start the engine.	4.7 V or less
25	S4-(Sine-)	Start the engine.	2 V or less
26	Torque sensor main signal	Start the engine.	4.7 V or less
27	R1+(Exciler+)	Start the engine.	2 V or less
28	R2-(Exciler-)	Start the engine.	2 V or less
30	Torque sensor power supply	Start the engine.	5.3 V or less
31	Torque sensor earth	Always	1 V or less
32	Torque sensor and resolver GND	Always	1 V or less

CONNECTOR C-141-1 TERMINALS VOLTAGE REFERENCE CHART

Terminal No.	Check item	Checking requirement	Normal condition
41	Motor V	Start the engine.	Battery voltage or less
42	Motor W	Start the engine.	Battery voltage or less

CONNECTOR C-141-2 TERMINALS VOLTAGE REFERENCE CHART

Terminal No.	Check item	Checking requirement	Normal condition
51	Motor U	Start the engine.	Battery voltage or less

CONNECTOR C-141-3 TERMINALS VOLTAGE REFERENCE CHART

SPECIAL TOOLS

SPECIAL TOOLS 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. Electrical power steering-ECU check (Diagnostic trouble code, data list) 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 - Making voltage and resistance measurement during troubleshooting MB991897 or MB992011 Ball joint remover MB991113-01, MB990635-01 or General service tool Knuckle and tie rod end ball joint disconnection NOTE: Steering linkage puller (MB990635 or MB991113) is also available to disconnect knuckle and tie rod end ball joint. MB990326 Preload socket General service tool Tie rod end ball joint breakaway torque check MB990784 Ornament remover General service tool Cover removal MB990228 or MB991006 Preload socket MB990228-01 Steering gear total pinion torque check MB990803 Steering wheel puller General service tool Steering wheel removal MB992209 Bellows band crimping tool MB992209 Bellows band installation MB992249 Variable spanner MB992249 Tie-rod removal and installation

Scheme 23

Scheme 23: SPECIAL TOOLS

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

STEERING WHEEL FREE PLAY CHECK

With the engine running (hydraulic pressure applied), position the front wheel in the straight ahead position.
Measure the side to side steering wheel play until the front wheels actually start moving while turning the steering wheel slightly in the left and right directions. Limit: 30 mm (1.2 inch) or less
If the steering wheel free play exceeds the limit value, check the steering shaft joint or steering linkage for looseness, and replace or repair the faulty components if necessary.
If the steering wheel free play is outside the standard value after Step 3 is performed, remove the steering gear and linkage (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ), and check and adjust the pinion total rotation torque (Refer to «STEERING GEAR TOTAL PINION TORQUE CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__steering-gear-total-pinion-torque-check) ).

STEERING ANGLE CHECK

CAUTION

After adjusting the steering angle, always perform calibration to make ASC-ECU learn the neutral position of the steering wheel sensor (Refer to STEERING WHEEL SENSOR CALIBRATION ) < Vehicles with ASC >.

Scheme 31

Scheme 32

Check that the wheel alignment is normal. (Refer to «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) .
Place the front wheel onto the turning radius gauge, and measure the steering angle. WHEEL ANGLE STANDARD VALUE SPECIFICATIONS Inner wheel 40°50' ± 1°30' (Difference between right and left wheels must be 2°00' or less) Outer wheel (reference value) 33°50'
If the measured value is not within the standard value, adjust the tie-rod ends (right and left), and repeat Steps 1 and 2 .
If the measured value is not within the standard value after performing Step 3 , replace the steering gear and linkage assembly. (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) .)

TIE-ROD LOOSENESS CHECK

When an abnormal noise is generated by the steering system, check the tie-rod for looseness. For the tie-rod looseness check, using a push-pull gauge and a spring scale, carry out the items below.

Install a dial gauge.
Check the points to load for a push-pull gauge and a spring scale.
Operate to stabilize the load and fluctuation with a push-pull gauge and a spring scale.
Carry out the dial gauge measurement and calculation with a push-pull gauge and a spring scale.

Scheme 33

Scheme 33: When the push-pull gauge is used

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Before the looseness check, check the items below. Check that the Mitsubishi genuine wheel with specified size is mounted. Also check that the wheel bearing is not loose. (Refer to «WHEEL BEARING END PLAY CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/axle-shafts/#front-axle-except-lancer-evolution__wheel-bearing-end-play-check) .) Raise the vehicle at the jack up point on the side sill of the inspection side, and lift the tire for approximately 30 mm (1.2 in). At this time, check that the tire of the opposite side is grounded.
Install a dial-gauge respectively to the "Position a (front side position)" and "Position b (rear side position)" on the wheel rim, 25 mm (1.0 in) below from the wheel center. (Install the dial gauges to the smooth position that is around the edge of the tire.)
The push-pull gauge shall be set to the smooth position that is 25 mm (1.0 in) above from the wheel center and the edge of the tire on the wheel rim. Then the position on the vehicle front side shall be the "Position A" and the vehicle rear side shall be the "Position B".
To stabilize the relationship between the load and fluctuation, push with the specified load by wheel size in the order of "Position A", "Position B", and "Position A" using the push-pull gauge. Note that the pushed load on each position shall be extracted. LOAD SPECIFICATIONS WITH RESPECT TO WHEEL Wheel size Specified load 16 inches 120 N 18 inches 100 N
Using the push-pull gauge, carry out the procedure below to read the value on the dial gauge and calculate the looseness. NOTE: The +/- sign acquired with the calculation result shall be used as it is. While pushing the "Position B" with the specified load by wheel size, read the values on the dial gauges at the "Position a" and "Position b". The values of the dial gauges at this time shall respectively be "aB" and "bB". LOAD SPECIFICATIONS WITH RESPECT TO WHEEL Wheel size Specified load 16 inches 120 N 18 inches 100 N Remove the load in the "Position B". Then while pushing the "Position A" with the specified load by wheel size, read the values on the dial gauge in the "Position a" and "Position b". The values on the dial gauges at this time shall respectively be "aA" and "bA". LOAD SPECIFICATIONS WITH RESPECT TO WHEEL Wheel size Specified load 16 inches 120 N 18 inches 100 N Make calculation taking the value differences of the dial gauge positions a and b which were read while pushing the "Position A" and "Position B" as each fluctuation. Fluctuation of the dial gauge position a: aA - aB Fluctuation of the dial gauge position b: bA - bB Calculate each fluctuation difference of the dial gauge positions a and b acquired above for looseness. Perform the procedure above twice. Fluctuation of the dial gauge position a - Fluctuation of the dial gauge position b Calculate the average of the looseness calculated twice.
If the average exceeds the standard value, check the ball joint rotation torque. (Refer to «TIE ROD END BALL JOINT ROTATION TORQUE CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__tie-rod-end-ball-joint-rotation) .) Standard value: Within ± 2.0 mm (0.08 in) NOTE: Measure the tie-rod looseness on the right side and left side respectively.

Scheme 40

Scheme 40: When a spring scale is used

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Carry out the confirmation before the looseness check with the same manner as the check using a push-pull gauge.
At the position that is 25 mm (1.0 in) above from the wheel center, bind the tire and the wheel rim with a cord for both the front and rear sides, and fix them with a tape not to loose vertically.
Set the spring scale to the cord bound as above. At this time, the point to pull shall be in the dimension between the "Position C" and "Position D" by wheel size, and the position on the vehicle front side shall be the "Position C" and the vehicle rear side shall be the "Position D". POSITION C AND D DIMENSIONS Wheel size C - D dimension 16 inches 480 - 495 mm (18.9 - 19.5 in) 18 inches 525 mm (20.7 in)
To stabilize the relationship between the load and fluctuation, pull with the specified load by wheel size in the order of "Position C", "Position D", and "Position C" using the spring scale. Note that the pulled load on each position shall be extracted. LOAD SPECIFICATIONS WITH RESPECT TO WHEEL Wheel size Specified load 16 inches 120 N 18 inches 80 N
Using the spring scale, carry out the procedure below to read the value on the dial gauge and calculate the looseness. NOTE: The +/- sign acquired with the calculation result shall be used as it is. While pulling the "Position D" with the specified load by wheel size, read the values on the dial gauges in the "Position a" and "Position b". The values on the dial gauges at this time shall respectively be "aD" and "bD". LOAD SPECIFICATIONS WITH RESPECT TO WHEEL Wheel size Specified load 16 inches 120 N 18 inches 80 N Remove the load at the "Position D". Then while pulling the "Position C" with the specified load by wheel size, read the values on the dial gauge in the "Position a" and "Position b". The values on the dial gauges at this time shall respectively be "aC" and "bC". LOAD SPECIFICATIONS WITH RESPECT TO WHEEL Wheel size Specified load 16 inches 120 N 18 inches 80 N Make calculation taking the value differences of the dial gauge positions a and b which were read while pulling the "Position C" and "Position D" as each fluctuation. Fluctuation of the dial gauge position a: aC - aD Fluctuation of the dial gauge position b: bC - bD Calculate each fluctuation difference of the dial gauge positions a and b acquired above for looseness. Perform the procedure above twice. Fluctuation of the dial gauge position a - Fluctuation of the dial gauge position b Calculate the average of the looseness calculated twice.
If the average exceeds the standard value, check the ball joint rotation torque. (Refer to «TIE ROD END BALL JOINT ROTATION TORQUE CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution__tie-rod-end-ball-joint-rotation) .) Standard value: Within ± 2.0 mm (0.08 in) NOTE: Measure the tie-rod looseness on the right side and left side respectively.

BALL JOINT DUST COVER CHECK

Using your fingers, press the dust cover to check for a crack or damage.
If there are any cracks in the dust cover or it is damaged, replace the tie-rod end (Refer to «DISASSEMBLY AND ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). NOTE: If the dust cover has a crack or damage, the ball joint could be damaged.

TIE ROD END BALL JOINT ROTATION TORQUE CHECK

Required Special Tools

MB990326: Preload Socket
MB991897 or MB992011: Ball Joint Remover CAUTION: Loosen the jam nut (tie-rod end connection) from the ball joint, but do not remove here. Use the special tool. To prevent the special tool from dropping off, suspend it with a cord.

Scheme 46

Scheme 47

Scheme 48

Install special tool MB991897 or MB992011 as shown in the figure.
Turn the bolt and knob to make the special tool jaws parallel, then hand-tighten the bolt. After tightening, check that the jaws are still parallel. NOTE: To adjust the special tool jaws to be parallel, set the orientation of the knob as shown in the figure.
Unscrew the bolt to disconnect the ball joint.
Move the ball joint stud several times and install the nut on the stud. Using the special tool MB990326, measure the ball joint rotation torque. Standard value: 2.9 N.m (26 in-lb) or less
If the rotation torque exceeds the standard value, replace the tie rod end (Refer to «DISASSEMBLY AND ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ).
If the rotation torque is under the standard value, check the ball joint for end play or ratcheting. If no end play or ratcheting, the ball joint can be reused.
Install the tie rod end to the knuckle, then tighten a new jam nut to the specified torque. Tightening torque: 52 ± 2 N.m (38 ± 1 ft-lb)

STATIONARY STEERING FORCE CHECK

The service procedure is the same as the vehicles with power steering (Refer to STATIONARY STEERING EFFORT CHECK ).

STEERING WHEEL RETURN TO CENTER CHECK

Conduct a road test

Scheme 49

Scheme 49: STEERING WHEEL RETURN TO CENTER CHECK

Make both gradual and sudden turns and check the steering wheel return.
At a vehicle speed of approximately 22 mph (35 km/h), turn the steering wheel 90 degrees, hold a few seconds, then release. If the steering wheel then returns 70 degrees or more, the return can be judged satisfactory.

STEERING COLUMN SHAFT ASSEMBLY SHOCK ABSORBING MECHANISM CHECK

WARNING

If the vehicle continues to be driven after the collision absorbing mechanism has operated, the steering column shaft may be damaged while it is in use. If there is a slack in the mounting base, do not attempt to repair it. Replace the steering column shaft assembly.

If a collision accident occurs or severe impact is applied on the steering wheel, the collision energy absorbing mechanism may have operated. Once the mechanism has operated, it will be inoperative even if it has suffered no apparent damage. Determine if the steering column shaft can be reused by the following procedure. If the collision energy absorbing mechanism has already operated, replace the steering shaft assembly (Refer to STEERING COLUMN SHAFT ASSEMBLY ). If any excessive radial free play on the steering wheel is found with the tilt lever in the lock position, always inspect the steering shaft assembly.

Scheme 50

Scheme 50: Inspection procedure

Remove the lower and upper column covers. CAUTION: After inspection, do not release the tilt lever until the steering shaft assembly has been installed.
Ensure that the tilt lever is in the lock position.
Loosen the two upper steering column mounting bolts by two turns.
Hold the one-way capsules as shown in the figure, and then try to rock them. If there is a slack in either of the capsules, replace the steering column shaft assembly (Refer to «STEERING COLUMN SHAFT ASSEMBLY»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ). Reference: The mounting base is fixed to the column bracket with the rivet. Before the collision energy absorbing mechanism operates, the column bracket is secured to the mounting base. After operation, the rivet will break off causing a slack. CAUTION: Be careful that nothing is pinched between the mounting base and the body. After inspection, do not release the tilt lever until the steering shaft assembly has been installed.
After inspection, if there is no fault, tighten the two steering column upper side mounting bolts (2 bolts) to the specified torque. Tightening torque: 12 ± 3 N.m (106 ± 27 in-lb)

REMOVAL AND INSTALLATION

The removal and installation procedure is the same as the vehicles with power steering (Refer to STEERING WHEEL ).

Scheme 51

Scheme 51: REMOVAL AND INSTALLATION

<< A >> KNOB CAP REMOVAL

Remove the knob cap while pressing the two projections.

Scheme 52

Scheme 52: << B >> STEERING SHAFT COVER REMOVAL

Remove the clip (for securing the floor carpet), and peel off the floor carpet.
Remove the clip (for securing the steering shaft cover), and then remove the steering shaft cover.

Scheme 53

Scheme 53: << C >> STEERING COLUMN SHAFT ASSEMBLY DISCONNECTION

Remove the steering column bolt connecting the steering gear to the steering column assembly.
Disconnect the steering gear from the steering column assembly while sliding the shaft A to the shaft B with the clip claw as shown in the figure is pinched.
Remove the steering column mounting bolt.

>> A << STEERING COLUMN SHAFT ASSEMBLY INSTALLATION

Ensure that the tilt lever is in the lock position.
Temporarily tighten the mounting bolts in the order of a, b, and c, and then tighten them in the order of c, b, and a to the specified torque. Tightening torque a: 28 ± 7 N.m (21 ± 5 ft-lb) Tightening torque b, c: 12 ± 3 N.m (106 ± 27 in-lb)

Scheme 54

Scheme 54: >> B << STEERING COLUMN BOLT (STEERING COLUMN SHAFT ASSEMBLY AND STEERING GEAR & LINKAGE CONNECTION)

Scheme 55

While sliding shaft A from shaft B with the clip claw as shown in the figure being pinched, connect the steering column shaft assembly and the steering gear and linkage.
Insert the steering column bolt from the no tapped bolt hole, and tighten it to the specified torque. Tightening torque : 20 ± 5 N.m (15 ± 4 ft-lb)

DISASSEMBLY AND ASSEMBLY

The disassembly and assembly procedure is the same as the vehicles with power steering (Refer to >> B << STEERING COLUMN BOLT (STEERING COLUMN SHAFT ASSEMBLY AND STEERING GEAR & LINKAGE CONNECTION) INSTALLATION ).

Scheme 56

Scheme 56: REMOVAL AND INSTALLATION

<< A >> ELECTRIC POWER STEERING DISCONNECTION

Peel off the floor carpet as shown in the figure. Remove the floor pad and then disconnect the electric power steering connector.

Scheme 57

Scheme 57: << A >> ELECTRIC POWER STEERING DISCONNECTION

<< B >> JAM NUT (TIE-ROD END AND KNUCKLE CONNECTION) REMOVAL

CAUTION

Loosen the jam nut (tie-rod end connection) from the ball joint, but do not remove here. Use the special tool. To prevent the special tool from dropping off, suspend it with a cord.

Scheme 58

Install special tool MB991897 or MB992011 as shown in the figure.
Turn the bolt and knob to make the special tool jaws parallel, then hand-tighten the bolt. After tightening, check that the jaws are still parallel. NOTE: To adjust the special tool jaws to be parallel, set the orientation of the knob as shown in the figure.
Unscrew the bolt to disconnect the ball joint.

Scheme 59

Scheme 59: << C >> FRONT AXLE CROSSMEMBER REMOVAL

Jack up and support the crossmember, and remove it.
Check the hoses and harnesses for roughness, and then remove the front suspension crossmember with the rear roll stopper and the steering gear and linkage installed.

>> A << STEERING COLUMN DASH PANEL COVER INSTALLATION

Install the steering column dash panel cover to the steering gear and linkage assembly by aligning L mark and the protrusion part of gearbox as shown in the figure.

Scheme 60

Scheme 60: >> A << STEERING COLUMN DASH PANEL COVER INSTALLATION

STEERING GEAR TOTAL PINION TORQUE CHECK

Required Special Tools

MB991006: Preload Socket CAUTION: When holding the steering gear in a vice, secure its mounting positions. If it is secured in any other place, the gear housing may become deformed or damaged.

Scheme 61

Using special tool preload socket (MB991006), rotate the pinion gear at the rate of one rotation in approximately 4 to 6 seconds to check the total pinion torque. Standard value: Total rotational torque: 1.29 - 2.23 N.m (11.4 - 19.7 in-lb) Torque fluctuation: 0.92 N.m (8.1 in-lb) or less NOTE: When measuring, remove the bellows from the rack housing. Measure the pinion torque through the whole stroke of the rack.
If not within the specification, replace the steering gear and linkage assembly (Refer to «POWER STEERING GEAR BOX AND LINKAGE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/electronic-steering/#electrical-power-steering-except-lancer-evolution) ).

Scheme 62

Scheme 62: DISASSEMBLY AND ASSEMBLY

Required Special Tool

MB992209: Boot band clipping tool
MB992249: Variable spanner

Scheme 63

Scheme 63: LUBRICATION AND SEALING POINTS

Scheme 64

Scheme 64: << A >> TIE-ROD REMOVAL

Scheme 65

Move the bellows and pull the rack bar toward arrow direction shown in illustration. CAUTION: Do not tighten the vise strongly in order not to damage the rack bar.
Wrap rack bar with cloth in order not to damage, and fix the rack bar with a vise.
Use special tool variable spanner (MB992249) to remove the tie-rod.

>> A << TIE-ROD INSTALLATION

CAUTION

Do not tighten the vise strongly in order not to damage the rack bar.

Wrap rack bar with cloth in order not to damage, and fix the rack bar with a vise.
Use the tool to install the tie rod. Tightening torque: 84 ± 14 N.m (62 ± 10 ft-lb)

>> B << BAND INSTALLATION

CAUTION

Hold the rack housing, and use special tool bellows band crimping tool (MB992209) to crimp the bellows band securely. Crimp the bellows band until special tool (MB992209) touches the stopper.

Scheme 66

Scheme 67

Use special tool (MB992209) to crimp the bellows band.
Check that crimped width (A) is within the standard value. Standard value (A): 2.4 - 2.8 mm (0.09 - 0.11 in)

>> C << TIE-ROD END/JAM NUT INSTALLATION

Screw in the tie-rod to the length shown in the figure, and hand-tighten the jam nut.

Note. Install the steering gear and linkage to the body, adjust the toe-in, and then tighten the jam nut to the specified torque.

Scheme 68

Scheme 68: REMOVAL AND INSTALLATION

Electrical Power Steering - Except Lancer Evolution Mitsubishi Lancer Evolution X

GENERAL INFORMATION

Scheme 1

SPECIFICATIONS

Scheme 2

ELECTRICAL PARTS AND FUNCTIONS

Scheme 3

Scheme 4

Scheme 5

Scheme 6

CAN COMMUNICATION

FAIL-SAFE FUNCTION

DIAGNOSTIC FUNCTION

DIAGNOSTIC TROUBLE CODE SET

SERVICE DATA OUTPUT

IGNITION SWITCH ON

Scheme 7

Scheme 8

FAIL-SAFE FUNCTION OPERATION

SERVICE SPECIFICATIONS

LUBRICANT

SEALANT

DIAGNOSIS TROUBLESHOOTING FLOW

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

Scheme 9

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES

HOW TO DIAGNOSE THE CAN BUS LINE

CHECK OF FREEZE FRAME DATA

CHECK OF ELECTRIC POWER STEERING WARNING DISPLAY

Scheme 10

DIAGNOSTIC TROUBLE CODE CHART

Scheme 11

OPERATION

FUNCTION

Check Conditions

Judgment Criterion

Fail Safe, Back Up Function

PROBABLE CAUSES

DIAGNOSIS

Scheme 12

Scheme 13

DTC C1512: Torque sensor main/sub voltage

DTC C1513: Torque sensor power supply

Scheme 14

DTC C1514: Torque sensor power supply too low

Scheme 15

Scheme 16

DTC C1540: Power supply voltage abnormality (high voltage)

Scheme 17

Scheme 18

Scheme 19

Scheme 20

DTC C1550: ECU internal error

DTC C1560: Vehicle speed data (CAN) time-out

DTC C1561: Engine revolution data (CAN) time-out

DTC U0001: Bus off

DTC U0100: Engine time-out error; DTC U0121: ABS time-out error; DTC U0141: ETACS time-out error

DTC U0401: Engine revolution data input malfunction

DTC U0415: Vehicle speed (CAN message) data input malfunction

DTC U1415: Variant coding not implemented

DTC U1417: Variant coding value invalid (includes faulty installation)

TROUBLE SYMPTOM CHART

COMMENTS ON TROUBLE SYMPTOM

Scheme 21

DATA LIST REFERENCE TABLE

ACTUATOR TEST REFERENCE TABLE

Scheme 22

SPECIAL TOOLS

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

STEERING WHEEL FREE PLAY CHECK

STEERING ANGLE CHECK

Scheme 31

Scheme 32