Traction Control/active Skid Control System: Other Mitsubishi Eclipse IV рестайлинг

SYSTEM CHECK SOUND

When starting the engine, a thud sound can sometimes be heard coming from the engine compartment. This is a normal sound during the TCL/ASC self-check.

G AND YAW RATE SENSOR

This sensor is mounted under the floor console, and detects lateral acceleration, longitudinal acceleration and steering angular velocity of the vehicle.

Scheme 272

Scheme 273

1. This sensor is mounted behind the column switch, and detects the steering wheel position.
2. The steering wheel sensor has a self-diagnosis function and a memory function. If the diagnosis function finds a trouble, it sends a DTC code to the TCL/ASC-ECU. Then the ECU will illuminate the TCL/ASC indicator. NOTE: For the details of the DTC codes, refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-308302-S23690000172009020200000) .

ASC OFF SWITCH

This switch is mounted on the left side of the instrument panel, and turns on and off the system.

Scheme 274

HYDRAULIC UNIT

The hydraulic unit includes a cut valve, suction valve and pressure switch for the ASC control additionally, compared with the conventional hydraulic unit for the ABS control.

TCL/ASC INDICATOR AND ASC OFF INDICATOR

The TCL/ASC indicator and ASC OFF indicator illuminate or flash under the conditions below to inform the driver.

TCL/ASC INDICATOR

1. When the ASC is active, the indicator flashes. (4Hz)
2. When the TCL is active, the indicator flashes. (4Hz)
3. When sensors related to TCL/ASC are not initialized, the indicator flashes. (2Hz)
4. When there is a failure in the TCL/ASC, the indicator illuminates.

ASC OFF INDICATOR

1. When the TCL is inactive, the indicator illuminates.
2. When the TCL/ASC is defective, the indicator illuminates.
3. When the brake pad temperature is high, the ASC OFF indicator flashes at a rate of 2 Hz.

TCL/ASC-ECU

The ECU incorporates the ABS-ECU, ASC-ECU, and TCL-ECU. The integral design allows joint operation of the TCL/ASC-ECU with the ABS and coordinated control of the driving force and braking force.

SYSTEM CONFIGURATION

The TCL/ASC is a system that adds a yaw rate sensor, a lateral G sensor, a steering wheel sensor and master cylinder pressure sensor (incorporated in hydraulic unit) to the ABS system.

JOINT CONTROL

The ASC transmits data necessary for control of the ABS and the TCL, performing joint control.

CONTROL CONTENT

HOW TO READ DATA LIST

Required Special Tools

1. 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

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "System Select."
4. Choose "ABS/ASC/ASTC."
5. Select "Data List."
6. Choose an appropriate item and select the "OK" button.

COMMENT

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

The cause is probably an open-circuit in the ASC OFF switch circuit.

The fail-safe function is probably canceling TCL/ASC system. In this case, scan tool MB991958 can be used to Retest each system by checking the diagnostic trouble codes.

DATA LIST REFERENCE TABLE

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

DATA LIST REFERENCE

TERMINAL VOLTAGE CHECK CHART

Required Special Tool

MB991997: ASC Check Harness

Scheme 275

1. Disconnect the TCL/ASC-ECU connector A-38, and then use special tool MB991997 to measure the voltages between terminals (47) and each terminal other than terminal (16) as well as between terminal (16) and each terminal other than terminal (47).
2. The terminal layouts are shown in the illustrations below. NOTE: Do not measure terminal voltage for approximately three seconds after the ignition switch is turned "ON." The TCL/ASC-ECU performs the initial check during that period. CHECKING REQUIREMENT REFERENCE CONNECTOR TERMINAL NO SIGNAL CHECKING REQUIREMENT NORMAL CONDITION 1 Motor power supply Ignition switch: "ON" Battery positive voltage Motor power supply Ignition switch: "LOCK" (OFF) Battery positive voltage 4 TCL/ASC-ECU power supply Ignition switch: "ON" Battery positive voltage Ignition switch: "START" Approximately 0 V 32 Solenoid valve power supply Always Battery positive voltage 38 ASC OFF switch output Ignition switch: "ON" 1.0-6.2 V 41 Stop light switch input Ignition switch: "ON" Stop light switch: "ON" 1.3-6.3 V Stop light switch: "OFF" Approximately 0 V

WHEEL SPEED SENSOR OUTPUT VOLTAGE MEASUREMENT

Required Special Tool

MB991997: ASC Check Harness

Scheme 276

Scheme 277

1. Release the parking brake and lift up the vehicle.
2. Disconnect the TCL/ASC-ECU connector A-38, and then use special tool MB991997 to measure the output voltage at the harness side connector. OUTPUT VOLTAGE CHART TERMINAL NO. Front left Front right Rear left Rear right 45 33 36 42 46 34 37 43
3. Manually turn the wheel to be measured 1/2 to 1 turn/second. Measure the output voltage with a voltmeter or oscilloscope. NOTE: Check the connection of the sensor harness and connector before using the oscilloscope. Output voltage: Minimal voltmeter reading: 42 mV Maximum voltmeter reading: 300 mV Minimal oscilloscope reading: 120 mV Maximum oscilloscope reading: 600 mV Probable causes of low output voltage Wheel speed sensor pole piece-to-Wheel speed rotor clearance too large Faulty Wheel speed sensor
4. To observe the waveform with an oscilloscope: Front Wheels: Shift into 1st gear < M/T > or "D" range < A/T > and drive the wheels. Rear Wheels: Turn the wheels manually at a constant speed NOTE: The output waveform is low when the wheel speed is low. Similarly, it will be higher as the wheel speed increases. Waveform may also be observed by driving the vehicle. POINTS IN WAVEFORM MEASUREMENT POINTS IN WAVEFORM MEASUREMENT SYMPTOM PROBABLE CAUSE REMEDY Too small or zero waveform amplitude Faulty Wheel speed sensor or excessive gap between it and the Wheel speed rotor Replace Wheel speed sensor Waveform amplitude fluctuates excessively (This is no problem if the minimum amplitude is 100 mV or more) Axle hub eccentric or with large runout Replace hub assembly Faulty TCL/ASC-ECU ground Repair harness wires Noisy or disturbed waveform Open circuit in Wheel speed sensor Replace Wheel speed sensor Open circuit in harness Repair harness wire Incorrectly mounted Wheel speed sensor Mount Wheel speed sensor correctly Wheel speed rotor with missing or damaged teeth Replace Wheel speed rotor NOTE: The Wheel speed sensor cable moves in relation to motion of the front or rear suspension. Therefore, it is likely that it has an open circuit only when driving on rough roads but it functions normally when driving on smooth roads. It is recommended to observe sensor output voltage waveform also under special conditions, such as driving on a rough road.

HYDRAULIC UNIT CHECK

Required Special Tools

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

Scheme 278

1. Jack up the vehicle. Then support the vehicle with rigid racks at the specified jack-up points or place the front or rear wheels on the rollers of the braking force tester.
2. Release the parking brake, and feel the drag force (drag torque) on each road wheel. When using the braking force tester, take a reading of the brake drag force. 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.
3. Connect scan tool MB991958 to the data link connector.
4. After checking that the neutral position < M/T > or selector lever is in "P" range < A/T >, start the engine.
5. Select "System Select."
6. Choose "ABS/ASC/ASTC."
7. Select "Actuator Test" from "ABS/ASC/ASTC" screen
8. Choose an appropriate item for hydraulic unit check. NOTE: The TCL/ASC system will switch to the scan tool mode and the ABS warning light, TCL/ASC work indicator and ASC OFF indicator will illuminates. NOTE: When the ABS and TCL/ASC has been interrupted by the fail-safe function, scan tool MB991958 actuator testing cannot be used.
9. Turn the wheel by hand and check the change in braking force when the brake pedal is depressed. When using the braking force tester, depress the brake pedal until the braking force is at the following values, and check that the braking force changes to the brake drag force reading taken in step 2 when the actuator is force-driven. The result should be as shown in the diagram above. BRAKING FORCE REFERENCE Front wheel 785-981 N (176-220 lb) Rear wheel 588-784 N (132-176 lb)
10. If the result of inspection is abnormal, repair according to the Diagnosis Table below. DIAGNOSIS CHART DIAGNOSIS TABLE SCAN TOOL M.U.T.-III DISPLAY OPERATION INSPECTION RESULT JUDGMENT PROBABLE CAUSE REMEDY 01 FL wheel ABS drive 02 FR wheel ABS drive 03 RL wheel ABS drive 04 RR wheel ABS drive 05 FL wheel TCL drive 06 FR wheel TCL drive 07 RL wheel TCL drive 08 RR wheel TCL drive Depress brake pedal to lock wheel. Using scan tool MB991958, select the wheel to be checked and force the actuator to operate. Turn the selected wheel manually to check the change of brake force. Brake force is released for three seconds after wheels have been locked. Normal - - Wheel does not lock when brake pedal is depressed. Abnormal Clogged brake line other than hydraulic unit Check and clean brake line Clogged hydraulic circuit in hydraulic unit Replace hydraulic unit assembly Brake force is not released Incorrect hydraulic unit brake tube connection Connect correctly Hydraulic unit solenoid valve not functioning correctly Replace hydraulic unit assembly
11. After inspection, disconnect scan tool MB991958 immediately after turning the ignition switch to the "LOCK" (OFF) position.

IN THE EVENT OF A DISCHARGED BATTERY

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

>> A << BRAKE TUBE CONNECTION

Connect the tubes to the hydraulic unit assembly as shown in the illustration.

Scheme 279

1. From the master cylinder (secondary)
2. From the master cylinder (primary)
3. To the front brake (RH)
4. To the front brake (LH)
5. To the rear brake (LH)
6. To the rear brake (RH)

ASC OFF SWITCH CONTINUITY CHECK

TESTER CONNECTION AND SPECIFIED CONDITION

Scheme 280