Mitsubishi Outlander GS45X. Manual - part 384

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-157

Inspection Procedure 3: ABS warning light does not illuminate when ignition switch is turned to the 
ON position (engine stopped).

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect DTC may be set. Prior to this diagnosis, diagnose 
the CAN bus lines (Refer to GROUP 54C 

− CAN Bus 

Line Diagnostic Flow 

P.54C-10

).

• Whenever ECU is replaced, ensure that the CAN bus 

lines are normal.

.

SYSTEM OPERATION

• ABS-ECU sends the illumination request signal of the ABS 

warning light to the combination meter through 
ETACS-ECU via CAN communication.

• ABS-ECU illuminates the ABS warning light via 

ETACS-ECU for approximately 3 seconds for valve check 
with the ignition switch turned to the ON position.

.

TECHNICAL DESCRIPTION (COMMENT)

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

.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Malfunction of ETACS-ECU

• Combination meter malfunction

• ABS-ECU malfunction

• Malfunction of coding data for ETACS-ECU

DIAGNOSIS

Required Special Tools:

• 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

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?

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

− 

CAN Bus Diagnostics Table 

P.54C-10

). Then go to 

Step 9.

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-158

STEP 2. M.U.T.-III diagnostic trouble code
Use M.U.T.-III to check the diagnostic trouble code for the ABS 
system.
Q: Is the diagnostic trouble code set?

YES : Carry out the diagnosis for the diagnostic trouble 

code (Refer to 

P.35B-15

).

NO :  Go to Step 3.

STEP 3. Scan tool actuator test
Perform the actuator test No.07 of the combination meter sys-
tem, and check if the ABS warning light illuminates.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Troubleshoot the combination meter, then go to Step 

4.

STEP 4. Check coding data
Refer to GROUP 00 

− Precautions before Service/Coding List 

P.00-44

.

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Go to Step 5.

STEP 5. ETACS-ECU variant coding
Perform the variant coding to the ETACS-ECU.
Q: Dose variant coding succeed?

YES : Go to Step 9.
NO :  Replace the ETACS-ECU (Refer to GROUP 54A 

− 

ETACS-ECU 

P.54A-825

), and then go to Step 9.

STEP 6. Scan tool other system diagnostic trouble code
Using scan tool, check that the diagnostic trouble code 
No.U0141 is not set by the combination meter system.
Q: Is the diagnostic trouble code set?

YES : Troubleshoot the combination meter, then go to Step 

9.

NO :  Go to Step 7.

STEP 7. Scan tool other system diagnostic trouble code
Using scan tool, check that the diagnostic trouble code 
No.U0121 is not set by the ETACS system.
Q: Is the diagnostic trouble code set?

YES : Troubleshoot the ETACS-ECU (Refer to GROUP 54A 

− ETACS/DTC 

P.54A-741

), then go to Step 9.

NO :  Replace the hydraulic unit (integrated with ABS-ECU) 

(Refer to 

P.35B-188

), then go to Step 8.

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-159

STEP 8. Retest the system.
Q: Does the ABS warning light turn ON and OFF normally?

YES : Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

NO :  Replace the hydraulic unit (integrated with ABS-ECU) 

(Refer to 

P.35B-188

). Then go to Step 9.

STEP 9. Retest the system.
Q: Does the ABS warning light turn ON and OFF normally?

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

Inspection Procedure 4: Brake warning light does not illuminate when the ignition switch is turned to 
ON position (engine stopped).

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect DTC may be set. Prior to this diagnosis, diagnose 
the CAN bus lines (Refer to GROUP 54C 

− CAN Bus 

Line Diagnostic Flow 

P.54C-10

).

• Whenever ECU is replaced, ensure that the CAN bus 

lines are normal.

.

CIRCUIT OPERATION

ABS-ECU sends the illumination request signal of the brake 
warning light to the combination meter through ETACS-ECU 
via the CAN communication.

.

TECHNICAL DESCRIPTION (COMMENT)

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

.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Malfunction of ETACS-ECU

• Combination meter malfunction

• ABS-ECU malfunction

DIAGNOSIS

Required Special Tools:

• 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

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-160

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?

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

− 

CAN Bus Diagnostics Table 

P.54C-10

).

STEP 2. Scan tool diagnostic trouble code
Use scan tool to check the diagnostic trouble code for the ABS 
system.
Q: Is the diagnostic trouble code set?

YES : Carry out the diagnosis for the diagnostic trouble 

code (Refer to 

P.35B-15

).

NO :  Go to Step 3.

STEP 3. Scan tool other system diagnostic trouble code
Using scan tool, check that the diagnostic trouble code 
No.U0141 is not set by the combination meter system.
Q: Is the diagnostic trouble code set?

YES : Troubleshoot the combination meter, then go to Step 

5.

NO :  Go to Step 4.

STEP 4. Scan tool other system diagnostic trouble code
Using scan tool, check that the diagnostic trouble code 
No.U0121 is not set by the ETACS system.
Q: Is the diagnostic trouble code set?

YES : Troubleshoot the ETACS (Refer to GROUP 54A 

− 

ETACS/DTC 

P.54A-741

), then go to Step 5.

NO :  Replace the hydraulic unit (integrated with ABS-ECU) 

(Refer to 

P.35B-188

), then go to Step 5.

STEP 5. Retest the system.
Q: Does the brake warning light turn ON and OFF 

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