Mitsubishi Outlander (2013+). Manual - part 451

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-47

STEP 4. ETACS-ECU coding data check
Use M.U.T.-III to check if coding data stored in 
ETACS-ECU is normal (Refer to GROUP 00 

− Pre-

cautions before Service/Coding List ).

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

STEP 5. ETACS-ECU coding data check
Perform the variant coding to the ETACS-ECU.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Replace the ETACS-ECU (Refer to GROUP 
54A 

− ETACS-ECU ), and then go to Step 9.

STEP 6. M.U.T.-III diagnosis code for other 
systems
Using M.U.T.-III, check that diagnosis code 
No.U0141 is not set by the combination meter sys-
tem.

Q: Is the diagnosis code set?

YES : 

Diagnose the combination meter (Refer to 

GROUP 54A 

− Combination 

Meter/Troubleshooting ). Then go to Step 9.

NO : 

Go to Step 7.

STEP 7. M.U.T.-III diagnosis code for other 
systems
Using M.U.T.-III, check that diagnosis code No. 
U0121 is not set by the ETACS system.

Q: Is the diagnosis code set?

YES : 

Perform troubleshooting on ETACS-ECU 

(Refer to GROUP 54A 

− 

ETACS/Troubleshooting ). Then go to Step 
9.

NO : 

Go to Step 8.

STEP 8. Retest the system.

Q: Does the ABS warning lamp turn ON and OFF 

normally?
YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use Troubleshooting/How to 

Cope with Intermittent Malfunctions ).

NO : 

Replace the hydraulic unit (integrated with 
ABS-ECU) (Refer to 

P.35B-61

). Then go to 

Step 9.

STEP 9. Retest the system.

Q: Does the ABS warning lamp turn ON and OFF 

normally?
YES : 

This diagnosis is complete.

NO : 

Return to Step 1.

Inspection Procedure 4: Brake warning lamp 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 incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C 

− CAN Bus Diagnostics 

Table ).

• Before replacing the ECU, ensure that the 

communication circuit is normal.

OPERATION

• ABS-ECU sends the illumination request signal of 

the break warning lamp to the combination meter 
through ETACS-ECU via the CAN communica-
tion.

• ABS-ECU illuminates brake warning lamp via 

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

COMMENTS ON TROUBLE SYMPTOM

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

• Malfunction of combination meter

• Malfunction of ABS-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III 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 ). Then 

go to Step 7.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-48

STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the 
ABS system.

Q: Is the diagnosis code set?

YES : 

Carry out the diagnosis for the diagnosis 

code (Refer to 

P.35B-11

).

NO : 

Go to Step 3.

STEP 3. M.U.T.-III Special Function for other 
system
Perform the following special function by the combi-
nation meter system, and check if the ABS warning 
lamp illuminates (Refer to GROUP 54A 

− Combina-

tion Meter ).

• Item 6: Indicator (AUTO)

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the combination meter.

STEP 4. M.U.T.-III diagnosis code for other 
systems
Using M.U.T.-III, check that diagnosis code 
No.U0141 is not set by the combination meter sys-
tem.

Q: Is the diagnosis code set?

YES : 

Diagnose the combination meter (Refer to 

GROUP 54A 

− Combination 

Meter/Troubleshooting ). Then go to Step 7.

NO : 

Go to Step 5.

STEP 5. M.U.T.-III diagnosis code for other 
systems
Using M.U.T.-III, check that diagnosis code No. 
U0121 is not set by the ETACS system.

Q: Is the diagnosis code set?

YES : 

Perform troubleshooting on ETACS-ECU 

(Refer to GROUP 54A 

− 

ETACS/Troubleshooting ). Then go to Step 
7.

NO : 

Go to Step 6.

STEP 6. Retest the system.

Q: Does the brake warning lamp turn ON and OFF 

normally?
YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use Troubleshooting/How to 

Cope with Intermittent Malfunctions ).

NO : 

Replace the hydraulic unit (integrated with 
ABS-ECU) (Refer to 

P.35B-61

). Then go to 

Step 7.

STEP 7. Retest the system.

Q: Does the brake warning lamp turn ON and OFF 

normally?
YES : 

This diagnosis is complete.

NO : 

Return to Step 1.

Inspection Procedure 5: ABS warning lamp stays ON after the engine is started.

CAUTION

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

an incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C 

− CAN Bus Diagnostics 

Table ).

• Whenever ECU is replaced, ensure that the 

CAN bus lines are normal.

OPERATION

• ABS-ECU sends the illumination request signal of 

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

• ABS-ECU illuminates the ABS warning lamp via 

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

COMMENTS ON TROUBLE SYMPTOM

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

• Malfunction of combination meter

• Malfunction of ABS-ECU

NOTE: Due to the abnormality in the supply voltage, 

the diagnosis code may not be set even when the 
ABS warning lamp is illuminated.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-49

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III 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 ). Then 

go to Step 7.

STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the 
ABS system.

Q: Is the diagnosis code set?

YES : 

Carry out the diagnosis for the diagnosis 

code (Refer to 

P.35B-11

).

NO : 

Go to Step 3.

STEP 3. Check the ABS-ECU power supply 
circuit system.
Refer to 

P.35B-51

.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Carry out the diagnosis of ABS-ECU power 
supply circuit system (Refer to 

P.35B-51

).

STEP 4. M.U.T.-III diagnosis code for other 
systems
Using M.U.T.-III, check that diagnosis code 
No.U0141 is not set by the combination meter sys-
tem.

Q: Is the diagnosis code set?

YES : 

Diagnose the combination meter (Refer to 

GROUP 54A 

− Combination 

Meter/Troubleshooting ). Then go to Step 7.

NO : 

Go to Step 5.

STEP 5. M.U.T.-III diagnosis code for other 
systems
Using M.U.T.-III, check that diagnosis code 
No.U0121 is not set by the ETACS system.

Q: Is the diagnosis code set?

YES : 

Perform troubleshooting on ETACS-ECU 

(Refer to GROUP 54A 

− 

ETACS/Troubleshooting ). Then go to Step 
7.

NO : 

Go to Step 6.

STEP 6. Retest the system.
Drive the vehicle more at 10 km/h or high.

Q: Does the ABS warning lamp turn ON and OFF 

normally?
YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use Troubleshooting/How to 

Cope with Intermittent Malfunctions ).

NO : 

Replace the hydraulic unit (integrated with 
ABS-ECU) (Refer to 

P.35B-61

). Then go to 

Step 7.

STEP 7. Retest the system.
Drive the vehicle more at 10 km/h or high.

Q: Does the ABS warning lamp turn ON and OFF 

normally?
YES : 

This diagnosis is complete.

NO : 

Return to Step 1.

Inspection Procedure 6: Abnormality in brake operation

CAUTION

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

an incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C 

− CAN Bus Diagnostics 

Table ).

• Whenever ECU is replaced, ensure that the 

CAN bus lines are normal.

COMMENTS ON TROUBLE SYMPTOM

Although the cause of the trouble cannot be clearly 
resolved since it depends on the running status and 
road surface condition, the malfunction of the 
hydraulic circuit may occur if any diagnosis code is 
not detected.

PROBABLE CAUSES

• Malfunction of hydraulic unit (integrated with 

ABS-ECU)

• Malfunction of hydraulic circuit

• Malfunction of brake assembly

• Malfunction of brake booster

• Malfunction of master cylinder assembly

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-50

YES : 

Go to Step 2.

NO : 

Repair the CAN bus lines (Refer to GROUP 
54C 

− CAN Bus Diagnostics Table ). On 

completion, go to Step 2.

STEP 2. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the 
ABS system (Refer to 

P.35B-11

).

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Carry out the diagnosis for the diagnosis 
code chart (Refer to 

P.35B-11

).

STEP 3. Hydraulic unit (integrated with 
ABS-ECU) check
Check that the brake tube is correctly mounted to the 
hydraulic unit (integrated with ABS-ECU) (Refer to 

P.35B-61

).

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Connect the brake tubes correctly, and 
repair or replace the external brake lines of 
the hydraulic unit (integrated with 
ABS-ECU).

STEP 4. Brake operation check
Perform the following checks.

• Brake pedal check (Refer to GROUP 35A − 

On-vehicle Service/Brake Pedal Check ).

• Brake booster check (Refer to GROUP 35A − 

On-vehicle Service/Brake Booster Operation 
Check ).

• Check valve check (Refer to GROUP 35A − 

On-vehicle Service/Check Valve Operation 
Check ).

Q: Can any fault be found with the brake operation?

YES : 

Check the brake-related parts, and repair if 

necessary. Then, go to Step 5.

NO : 

Go to Step 5.

STEP 5. Hydraulic unit check
Perform the following actuator tests (Refer to 

P.35B-55

).

• Item No.01: FL wheel ABS

• Item No.02: FR wheel ABS

• Item No.03: RL wheel ABS

• Item No.04: RR wheel ABS

Q: Is the check result normal?

YES : 

This diagnosis is complete.

NO : 

Replace the hydraulic unit (integrated with 
ABS-ECU) (Refer to 

P.35B-61

).

Inspection Procedure 7: ABS system inoperative

CAUTION

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

an incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C 

− CAN Bus Diagnostics 

Table ).

• Whenever ECU is replaced, ensure that the 

CAN bus lines are normal.

COMMENTS ON TROUBLE SYMPTOM

In case of this trouble symptom, ABS system opera-
tion may be disabled. Diagnosis code may be set by 
the ABS system using M.U.T.-III.

PROBABLE CAUSES

• Low battery voltage

• Wiring harness or connector failure of CAN bus 

line

• The ABS-ECU is defective.

• Different ETACS-ECU, abnormal variant coding 

information

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III 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 ). On 

completion, go to Step 2.

STEP 2. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the 
ABS system. (Refer to 

P.35B-11

.)

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Carry out the diagnosis for the diagnosis 
code chart (Refer to 

P.35B-11

). Then go to 

Step 7.