Mitsubishi Outlander GS45X. Manual - part 353

ABS DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-33

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 C1020 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 C1020 set?

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

DTC C102B: Abnormality in RR wheel speed sensor circuit

AC703729

Wheel Speed Sensor Circuit

ABS-ECU

(LH)

(LH)

(RH)

(RH)

REAR WHEEL SPEED SENSOR

AB

FRONT WHEEL SEED SENSOR

ABS DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

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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

).

.

CIRCUIT OPERATION

• The wheel speed sensor is a type of pulse generator. It con-

sists of encoders (a plate on which north and south pole 
sides of the magnets are arranged alternately) for detecting 
the wheel speed which rotates at the same speed of the 
wheels and wheel speed sensors. This sensor outputs fre-
quency pulse signals in proportion to the wheel speed.

• The pulse signals, which the wheel speed sensor creates, 

are sent to ABS-ECU. ABS-ECU uses the frequency of the 
pulse signals to determine the wheel speed.

.

DTC SET CONDITIONS

ABS-ECU monitors the voltage fluctuation in each wheel speed 
sensor circuit. If ABS-ECU detects the open or short circuit in 
the circuit, it will set a DTC.

.

AC901112

Connector: A-01

A-01 (B)

AE

AC901075BC

Connector: C-129

AC901080AN

Connector: D-133

D-133 (B)

ABS DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

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PROBABLE CAUSES

Current trouble

• Damaged wiring harness and connectors

• Noise interference

• Malfunction of wheel speed sensor

• ABS-ECU malfunction

Past trouble

• Carry out diagnosis with particular emphasis on wiring har-

ness and connector failures between ABS-ECU and the 
wheel speed sensor. For diagnosis procedures, refer to 
How to treat past trouble (Refer to GROUP 00 

− How to 

Use Troubleshooting/How to Treat Past Trouble 

P.00-17

).

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

• MB991974: ABS check harness

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 3.
NO :  Repair the CAN bus lines (Refer to GROUP 54C 

− 

CAN Bus Diagnostics Table 

P.54C-10

). On 

completion, go to Step 2.

STEP 2. DTC recheck after resetting CAN bus lines
Q: Is the DTC C102B set?

YES : Go to Step 3.
NO :  The procedure is complete.

STEP 3. Scan tool data list
Check the following data list (Refer to 

P.35B-179

).

• Item No.04: RR wheel speed sensor

Q: Is the check result normal?

YES : Go to Step 12.
NO :  Go to Step 4.

ABS DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

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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 rear wheel speed sensor 

<RH> power supply terminal (signal terminal) No.16 and 
body ground, and between the wheel speed sensor ground 
terminal No.15 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.16 or 15) : 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 rear wheel speed 

sensor <RH> power supply terminal (signal terminal) No.16 
and body ground, and between the ground terminal No.15 
and body ground.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 8.
NO (Not normal at the terminal No.16 or 15) : Go to Step 

6.

AC611137AT

ABS-ECU

MB991974

A-01 ABS-ECU  
harness connector

Check harness

AC611137BR

ABS-ECU

MB991974

A-01 ABS-ECU  
harness connector

Check harness