Traction Control System (Tcl): Other Mitsubishi Eclipse IV рестайлинг

FEATURES

The Traction Control System (TCL) is adopted for vehicles with 3.8L engine.

1. When a drive wheel is judged to be slipping by some reasons such as excessive accelerator pedal depression on a low friction road, the TCL applies brake force to the slipping drive wheel or lowers the engine output to suppress the drive wheel slippage.
2. Fail-safe function ensures safety is maintained
3. Diagnostic function provides improved serviceability
4. To shorten the lines and enhance data transaxle reliability, communication with other ECU is performed over a CAN (Controller Area Network).

Scheme 339

COMPONENTS FUNCTION CHART

Scheme 340

SYSTEM CHECK SOUND

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

TCL SWITCH

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

Scheme 341

TCL SWITCH OPERATION AND THEIR RESPECTIVE CONTROL

TCL SWITCH OPERATION CHART

Note. The TCL returns to the active state automatically when the ignition switch is turned to the ON position.

HYDRAULIC UNIT

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

TCL INDICATOR AND TCL OFF INDICATOR

The TCL indicator and TCL OFF indicator illuminate under the conditions below to inform the driver.

TCL INDICATOR

1. When the TCL is active, the indicator flashes.

TCL OFF INDICATOR

1. When the TCL is inactive, the indicator illuminates.
2. When the TCL is defective, the indicator illuminates.

TCL INDICATOR, TCL OFF INDICATOR AND THEIR OPERATION PATTERN

TCL INDICATOR, TCL OFF INDICATOR AND THEIR OPERATION PATTERN

ABS/TCL-ECU

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

JOINT CONTROL

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

ABS OPERATION CHART

HOW TO READ DATA LIST

Required Special Tools

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: 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 "Interactive Diagnosis" from the start-up screen.
4. Select "System Select."
5. Choose "ABS/TCL" from the "CHASSIS" tab.
6. Select "Data List."
7. 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 ABS/TCL-ECU.

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

The fail-safe function is probably canceling TCL. 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 ABS/TCL-ECU input data.

DATA LIST REFERENCE

TERMINAL VOLTAGE CHECK CHART

Required Special Tool

MB991997: ASC Check Harness

Scheme 342

1. Disconnect the ABS/TCL-ECU connector A-03, and then use special tool MB991970 to measure the voltages between terminals (16) and each terminal other than terminal (47). Also measure voltages between terminal (47) and each terminal other than terminal (16). NOTE: Do not measure terminal voltage for approximately three seconds after the ignition switch is turned "ON." The ABS/TCL-ECU performs the initial check during that period.
2. The terminal layouts are shown in the illustrations below. CONNECTOR TERMINAL REFERENCE CONNECTOR TERMINAL NO SIGNAL CHECKING REQUIREMENT NORMAL CONDITION 1 Motor power supply Always Battery positive voltage 4 ABS/TCL-ECU power supply Ignition switch: "ON" Battery positive voltage 32 Solenoid valve power supply Always Battery positive voltage 38 TCL switch input Ignition switch: "ON" TCL switch: "ON" Battery positive voltage TCL switch: "OFF" Approximately 0 V 41 Stoplight switch input Ignition switch: "ON" Stoplight switch: "ON" Battery positive voltage Stoplight switch: "OFF" Approximately 0 V

WHEEL SPEED SENSOR OUTPUT VOLTAGE MEASUREMENT

Required Special Tool

MB991219: Inspection Harness

Scheme 343

Scheme 344

1. Release the parking brake and lift up the vehicle.
2. Disconnect the ABS/TCL-ECU connector A-03, and then use special tool MB991219 to measure the output voltage at the harness side connector. ABS/TCL-ECU CONNECTOR TERMINAL REFERENCE 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 SYMPTOM CHART 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 ABS/TCL-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 345

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 the selector lever is in "P" range, start the engine.
5. Select "Interactive Diagnosis" from the start-up screen.
6. Select "System Select."
7. Choose "ABS/TCL" from the "CHASSIS" tab.
8. Select "Actuator Test" from "ABS/TCL" screen
9. Choose an appropriate item for hydraulic unit check. NOTE: The ABS/TCL system will switch to the scan tool mode and the ABS warning light, TCL indicator and TCL OFF indicator will illuminates. NOTE: When the ABS and TCL has been interrupted by the fail-safe function, scan tool MB991958 actuator testing cannot be used.
10. 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 SPECIFICATION Front wheel 785 - 981 N (176 - 220 lb) Rear wheel 588 - 784 N (132 - 176 lb)
11. If the result of inspection is abnormal, repair according to the Diagnosis Table below. SCAN TOOL DISPLAY CHART DIAGNOSIS TABLE M.U.T.-III SCAN TOOL DISPLAY OPERATION INSPECTION RESULT JUDGMENT PROBABLE CAUSE REMEDY 01 FR VALVE 02 FL VALVE 03 RR VALVE 04 RL VALVE 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
12. 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/TCL 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 346

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)

TCL SWITCH CONTINUITY CHECK

CONTINUITY SPECIFICATION

Scheme 347