Mitsubishi Outlander GS45X. Manual - part 351

 

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Mitsubishi Outlander GS45X. Manual - part 351

 

 

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-25

STEP 4. Voltage measurement at the A-01 ABS-ECU 
connector
(1) Disconnect the ABS-ECU connector, connect special tool 

ABS check harness (MB991974) to the harness-side 
connector, and then measure the voltage at the special tool 
connector side.
NOTE: Do not connect the special tool ABS check harness 
(MB991974) to ABS-ECU.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the front wheel speed sensor 

<RH> power supply terminal (signal terminal) No.22 and 
body ground, and between the ground terminal No.21 and 
body ground.

OK: 1 volt or less

Q: Is the check result normal?

YES : Go to Step 5.
NO (Not normal at the terminal No.22 or 21) : Go to Step 

6.

STEP 5. Resistance measurement at A-01 ABS-ECU 
connector
(1) Disconnect the ABS-ECU connector, connect special tool 

ABS check harness (MB991974) to the harness-side 
connector, and then measure the resistance at the special 
tool connector side.
NOTE: Do not connect the special tool ABS check harness 
(MB991974) to ABS-ECU.

(2) Measure the resistance between the front wheel speed 

sensor <RH> power supply terminal (signal terminal) No.22 
and body ground, and between the wheel speed sensor 
ground terminal No.21 and body ground.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 8.
NO (Not normal at the terminal No.22 or 21) : Go to Step 

6.

AC611137AP

ABS-ECU

MB991974

A-01 ABS-ECU 
harness connector

Check harness

AC611137BP

ABS-ECU

MB991974

A-01 ABS-ECU  
harness connector

Check harness

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-26

STEP 6. Connector check: A-01 ABS-ECU connector, A-59 
front wheel speed sensor <RH> connector
Q: Is the check result normal?

YES : Go to Step 7.
NO :  Repair the defective connector.

STEP 7. Wiring harness check between A-01 ABS-ECU 
connector terminal No.22 and A-59 front wheel speed 
sensor <RH> connector terminal No.1, and between A-01 
ABS-ECU connector terminal No.21 and A-59 front wheel 
speed sensor <RH> connector terminal No.2.

• Check for short circuit in front wheel speed sensor <RH> 

circuit

Q: Is the check result normal?

YES : Replace the wheel speed sensor <FR> (Refer to 

P.35B-189

). Then go to Step 13.

NO :  Repair the wiring harness. Then go to Step 13.

STEP 8. Voltage measurement at the A-01 ABS-ECU 
connector
(1) Disconnect the ABS-ECU connector, connect special tool 

ABS check harness (MB991974) to the ABS-ECU-side 
connector and harness-side connector, and then measure 
the voltage at the special tool connector side.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the front wheel speed sensor 

<RH> power supply terminal (signal terminal) No.22 and 
body ground, and between the ground terminal No.21 and 
body ground.

OK:

Terminal No.22 and body ground: Approximately 

system voltage

Terminal No.21 and body ground: 1 volt or less

Q: Is the check result normal?

YES : Go to Step 9.
NO :  Go to Step 11.

AC611138AG

ABS-ECU

MB991974

A-01 ABS-ECU  
harness connector

Check harness

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-27

STEP 9. Wiring harness check between A-01 ABS-ECU 
connector terminal No.22 and A-59 front wheel speed 
sensor <RH> connector terminal No.1, and between A-01 
ABS-ECU connector terminal No.21 and A-59 front wheel 
speed sensor <RH> connector terminal No.2.

• Check for open circuit in front wheel speed sensor <RH> 

circuit

Q: Is the check result normal?

YES : Go to Step 10.
NO :  Repair the wiring harness. Then go to Step 13.

STEP 10. Check for wheel speed sensor <FR> as a single 
unit
Refer to 

P.35B-193

.

Q: Is the check result normal?

YES : Go to Step 11.
NO :  Replace the wheel speed sensor <FR> (Refer to 

P.35B-189

). Then go to Step 13.

STEP 11. Connector check: A-01 ABS-ECU connector, A-59 
front wheel speed sensor <RH> connector
Q: Is the check result normal?

YES : Go to Step 12.
NO :  Repair the defective connector. Then go to Step 13.

STEP 12. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.

NOTE: The ABS warning light does not turn OFF in some 
cases unless the vehicle runs at 12mph (20 km/h) or higher.

Q: Is DTC C1015 set?

YES : Replace the hydraulic unit (integrated with ABS-ECU) 

(Refer to 

P.35B-188

). Then go to Step 13.

NO :  Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

STEP 13. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.

NOTE: The ABS warning light does not turn OFF in some 
cases unless the vehicle runs at 12mph (20 km/h) or higher.

Q: Is DTC C1015 set?

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

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-28

DTC C1020: Abnormality in RL wheel speed sensor circuit

CAUTION

If there is any problem in the CAN bus lines, an incorrect 
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

).

.

AC703729

Wheel Speed Sensor Circuit

ABS-ECU

(LH)

(LH)

(RH)

(RH)

REAR WHEEL SPEED SENSOR

AB

FRONT WHEEL SEED SENSOR

AC901112

Connector: A-01

A-01 (B)

AE

AC901075BC

Connector: C-129

AC709496

AO

Connector: D-114

 

 

 

 

 

 

 

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