Mitsubishi 380. Manual - part 327

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-28

STEP 4. Retest the system

Q: Turn the ignition switch to the "ON" position. Do the 

"TCL OFF" indicator light and the TCL work indicator 
light illuminate for three seconds, and then go out after 
the engine starts?
YES : The procedure is complete.
NO : . Return to Step 1.

INSPECTION PROCEDURE 5: When the TCL Switch is Pushed On, TCL does not Cancel.

NOTE: If the ABS-8 ECU or the active wheel 
speed sensor are disconnected, or if the wiring is 
an open/ short circuit, the ABS 8 ECU will shut 
off power supply to the respective wheel speed 
sensor. All other wheel speed sensors will oper-
ate normally. To restore the power supply, the 
ignition switch must be turned to the "OFF" posi-
tion then to the "ON" position again.

.

CIRCUIT OPERATION

ABS/TCL-ECU terminal 21 is grounded every time 
the TCL switch is pressed. ABS/TCL-ECU monitors 
this operation state and turns the TCL ON or OFF.

.

COMMENT

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

.

TROUBLESHOOTING HINTS

• Malfunction of the TCL switch.

• Damaged harness or connector.

• Malfunction of the ABS/TCL-ECU.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991219: Inspection Test Harness

16DB402A

A-02 (GR)

CONNECTOR: A-02 

A-02 HARNESS CONNECTOR:

35DB115A

CONNECTORS: C-29, C-131

C-29

C-131(GR)

C-29 MALE SIDE

CONNECTOR

C-131 HARNESS

CONNECTOR:

COMPONENT SIDE

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-29

STEP 1. Measure the resistance at ABS/TCL-ECU 
connector A-02.
(1) Disconnect the ABS/TCL-ECU connector A-02.

(2) Measure the resistance at the ABS/TCL-ECU wiring 

harness-side connector A-02 using the Inspection test 
harness MB991219 (by inserting probe) and body ground.

NOTE: The special tool (Inspection test harness) 
MB991219 for connector pin contact pressure should be 
used. The test probe should never be forcibly inserted, as it 
may cause a defective contact.

(3) Turn the ignition switch to the "OFF" position.
(4) Measure the resistance by probing ABS/TCL-ECU 

connector A-02 terminal 21 (using inspection test harness 
MB991219) and ground.

NOTE: The special tool (Inspection test harness) 
MB991219 for connector pin contact pressure should be 
used. The test probe should never be forcibly inserted, as it 
may cause a defective contact.

• When the TCL switch is not pressed, the resistance  

should indicate an open circuit (more than 2 ohms).

• When the TCL switch is pressed, the resistance should 

measure 2 ohms or less. 

(5) Turn the ignition switch to the "LOCK" (OFF) position.
(6) Disconnect inspection test harness MB991219.
(7) Connect the ABS/TCL-ECU connector A-02.

Q: Is the resistance value more than 2 ohms when the TCL 

switch is not pressed, and is the resistance value less 
than 2 ohms when the TCL switch is pressed?
YES : Go to Step 6.
NO :  Go to Step 2.

16DB402A

A-02 (GR)

CONNECTOR: A-02 

A-02 HARNESS CONNECTOR:

35DB119A

CONNECTOR: A-02

TEST 

HARNESS

(MB991219)

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-30

STEP 2. Check the TCL switch.
(1) Remove the TCL switch. (Refer to 

P.13C-49

).

(2) Connect an ohmmeter to the TCL switch between terminals 

1 and 2.

(3) Check for continuity between terminals 1 and 2 when the 

TCL switch is operated.

• There is no continuity between terminals 1 and 2 when 

the TCL switch is not pressed.

• There is continuity between terminals 1 and 2 when the 

TCL switch is pressed.

Q: Is there no continuity between terminals 1 and 2 when 

the TCL switch is not pressed, and is there continuity 
when the TCL switch is pressed?
YES : Install the TCL switch. (Refer to 

P.13C-49

). Then go 

to Step 3.

NO :  Replace the TCL switch. (Refer to 

P.13C-49

). Then 

go to Step 7.

AC307176AB

C-131 TCL SWITCH

CONNECTOR

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-31

STEP 3. Check ABS/TCL-ECU connector A-02, 
intermediate connector C-29 and TCL switch connectors 
C-131 for loose, corroded or damaged terminals, or 
terminals pushed back in the connector.
Q: Are there connectors and terminals in good condition?

YES : Go to Step 4.
NO :  Repair or replace the faulty connector. (Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

). Then go to Step 7.

16DB402A

A-02 (GR)

CONNECTOR: A-02 

A-02 HARNESS CONNECTOR:

35DB115A

CONNECTORS: C-29, C-131

C-29

C-131(GR)

C-29 MALE SIDE

CONNECTOR

C-131 HARNESS

CONNECTOR:

COMPONENT SIDE