Mitsubishi Galant (2004+). Manual - part 1522

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

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TRACTION CONTROL SYSTEM (TCL)

13D-29

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

.

TROUBLESHOOTING HINTS

• Malfunction of the combination meter

• Damaged harness, connector

• Malfunction of the ABS/TCL-ECU

DIAGNOSIS

Required Special Tool:

• MB991958: Scan tool (MUT-III sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB cable

• MB991910: MUT-III main harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan tool MB991958 to the data link connector 

(Refer to 

P.13D-4

).

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line (Refer to 

P.13D-4

, How to 

diagnose CAN bus line).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is the check result satisfactory?

YES : Go to Step 2 
NO :  Repair the CAN bus lines (Refer to GROUP 54C, 

Diagnosis-Can Bus Diagnostic Chart 

P.54C-14

). 

Then go to Step 4 .

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

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TRACTION CONTROL SYSTEM (TCL)

13D-30

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector 

(Refer to 

P.13D-4

).

(2) Turn the ignition switch to the "ON" position.
(3) Use scan tool MB991958 to read the TCL diagnostic trouble 

codes (Refer to 

P.13D-4

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is any DTC set?

YES : Refer to 

P.13D-8

, Diagnostic Trouble Code Chart. 

Then go to Step 4 .

NO :  Go to Step 3 .

STEP 3. Using scan tool MB991958, read the diagnostic 
trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector 

(Refer to 

P.17-12

).

(2) Turn the ignition switch to the "ON" position.
(3) Check for Combination meter system diagnostic trouble 

code (Refer to GROUP 54A, Combination Meter Assembly 
Diagnosis - How to Read and Erase Diagnostic Trouble 
Code 

P.54A-54

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is DTC U1102 set?

YES : Replace the hydraulic unit (integrated with 

ABS/TCL-ECU) (Refer to GROUP 35B - Hydraulic 
Unit 

P.35B-109

). Then go to Step 4 .

NO :  Replace the combination meter assembly (Refer to 

GROUP 54A - Combination Meter Assembly 

P.54A-110

). Then go to Step 4 .

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

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TRACTION CONTROL SYSTEM (TCL)

13D-31

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 .

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

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TRACTION CONTROL SYSTEM (TCL)

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INSPECTION PROCEDURE 5: When the TCL Switch is Push On, TCL System dose not Cancelled.

AC307014

FRONT-ECU

RELAY
BOX

ABS/TCL-ECU

TAILLIGHT
RELAY

JOINT
CONNECTOR (1)

JUNCTION
BLOCK

TCL SWITCH

RHEOSTAT

BLACK

BLACK

BLACK-

YELLOW

BLACK-

YELLOW

ORANGE

GREEN-

WHITE

GREEN-

WHITE

GREEN-

WHITE

GREEN-

WHITE

ORANGE

TCL Switch System Circuit

AB