Mitsubishi 380. Manual - part 325

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-20

STEP 2. Using diagnostic tool MB991958, diagnose the 
CAN bus line.

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958 to the data link 

connector. (Refer to 

P.13C-3

).

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

P.13C-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect diagnostic tool MB991958.

Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C, 

Diagnosis 

− Can Bus Diagnostic Chart 

P.54C-15

). 

Then go to Step 6.

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

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958 to the data link 

connector. (Refer to 

P.13C-3

).

(2) Turn the ignition switch to the "ON" position.
(3) Check if a DTC, which relates to CAN 

communication-linked systems below, is set.
A/C-ECU

• DTC U1120: Failure Information on Engine-ECU 

(related to engine).  (Refer to GROUP 55, Auto A/C 
Diagnosis 

− Diagnostic Function − How to Read and 

Erase Diagnostic Trouble Code 

P.55-6

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect diagnostic tool MB991958.

Q: Is DTC U1120 set?

YES : Go to Step 4.
NO :  Go to Step 5.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-21

STEP 4. Using diagnostic tool MB991958, read the 
diagnostic trouble code.

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958 to the data link 

connector. (Refer to 

P.13C-3

).

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

trouble codes. (Refer to 

P.13C-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect diagnostic tool MB991958.

Q: Is DTC U1120 set?

YES : Replace the Engine-ECU. [Refer to GROUP 13A, 

Engine-ECU 

P.13A-675

]. Then go to Step 6.

NO :  It can be assumed that this malfunction is intermittent. 

(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-14

).

STEP 5. Using diagnostic tool MB991958, read the 
diagnostic trouble code.

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958 to the data link 

connector. (Refer to 

P.13C-3

).

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

trouble codes. (Refer to 

P.13C-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect diagnostic tool MB991958.

Q: Is DTC U1120 set?

YES : Replace the hydraulic unit (integrated with 

ABS/TCL-ECU). (Refer to GROUP 35B 

− Hydraulic 

Unit 

P.35B-93

). Then go to Step 6.

NO :  It can be assumed that this malfunction is intermittent. 

(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-14

).

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-22

STEP 6. Using diagnostic tool MB991958, read the 
diagnostic trouble code.

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958 to the data link 

connector. (Refer to 

P.13C-3

).

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

trouble codes. (Refer to 

P.13C-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect diagnostic tool MB991958.

Q: Is DTC U1120 set?

YES : Return to Step 1.
NO :  The procedure is complete.

U1400 Dynamic range error APS1

.

DTC SET CONDITION

This code is set when the MPI system sets either of 
DTCs P2138, P2122 or P2123.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THESE DTCS ARE 
TO SET ARE:)

• Malfunction of the MPI system

DIAGNOSIS

Check whether the MPI system sets either of diagnostic trouble 
codes P2138, P2122 or P2123, and repair if necessary. (Refer 
to GROUP 13A, MPI Diagnosis 

− Diagnostic Function − How to 

Read and Erase Diagnostic Trouble Code 

P.13A-6

).

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-23

SYMPTOM CHART

M1136003400029

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: When the Ignition Switch is Turned to the "ON" Position 
(Engine Stopped), the "TCL OFF" Indicator Light does not Illuminate. INSPECTION 
PROCEDURE 2: When the Ignition Switch is Turned to the "ON" Position (Engine 
Stopped), the TCL Work Indicator Light dose not Illuminate. INSPECTION 
PROCEDURE 3: The "TCL OFF" Indicator Light Remains Illuminated After the Engine 
is Started. INSPECTION PROCEDURE 4: The TCL Work Indicator Light Remains 
Illuminated After the Engine is Started.

SYMPTOM

INSPECTION 
PROCEDURE NO.

REFERENCE 
PAGE

Communication with 
diagnostic tool is not 
possible

Communication with all systems is 
impossible

-

Group 13A, MPI 
Diagnosis 

− 

Symptom 
Procedures 

− 

Inspection 
Procedure 1 

P.13A-539

.

Communication with the ABS/TCL-ECU 
only is impossible

-

Group 35B, ABS 
Diagnosis 

− 

Symptom 
Procedures 

− 

Inspection 
Procedure 1 

P.35B-72

.

When the ignition switch is turned to the "ON" position (engine 
stopped), the "TCL OFF" indicator light dose not illuminate.

1

P.13C-23

When the ignition switch is turned to the "ON" position (engine 
stopped), the TCL work indicator light does not illuminate.

2

The "TCL OFF" indicator light remains illuminated after the engine 
is started.

3

The TCL work indicator light remains illuminated after the engine 
is started.

4

When the TCL switch is push on, TCL does not be cancelled.

5

P.13C-28

TCL dose not operate.

6

P.13C-34