Mitsubishi Outlander GS45X. Manual - part 403

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-39

PROBABLE CAUSES

Current trouble

• Damaged wiring harness and connectors

• Noise interference

• Malfunction of wheel speed sensor

• ASC-ECU malfunction

Past trouble

• Carry out diagnosis with particular emphasis on wiring har-

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

− How to Use Trou-

bleshooting/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

• MB991997: ASC check harness

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
lines.
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 DTC C102B set?

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

STEP 3. Using scan tool MB991958, check data list
Check the following data list (Refer to 

P.35C-270

).

• Item No.04: RR wheel speed sensor

Q: Is the check result normal?

YES : Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunction 

P.00-15

).

NO :  Go to Step 4.

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-40

STEP 4. Voltage measurement at the A-02 ASC-ECU 
connector
(1) Disconnect the ASC-ECU connector, connect special tool 

ASC check harness (MB991997) to the harness-side 
connector, and then measure the voltage at the special tool 
connector side.
NOTE: Do not connect the special tool to ASC-ECU.

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

power supply terminal (signal terminal) No.43 and the body 
ground and between the wheel speed sensor ground 
terminal No.42 and the 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.43 or 42) : Go to Step 

6.

STEP 5. Resistance measurement at A-02 ASC-ECU 
connector
(1) Disconnect the ASC-ECU connector, connect special tool 

ASC check harness (MB991997) to the harness-side 
connector, and then measure the resistance at the special 
tool connector side.
NOTE: Do not connect the special tool to ASC-ECU.

(2) Measure the resistance between the wheel speed sensor 

power supply terminal (signal terminal) No.43 and the body 
ground and between the wheel speed sensor ground 
terminal No.42 and the body ground.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 8.
NO (Not normal at the terminal No.43 or 42) : Go to Step 

6.

AC611137BG

ASC-ECU

MB991997

A-02 ASC-ECU 
harness connector

Check harness

AC611137BZ

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU
harness connector

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-41

STEP 6. Connector check: A-02 ASC-ECU connector, 
C-129 intermediate connector, D-133 rear 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-02 ASC-ECU 
connector terminal No.43 and D-133 rear wheel speed 
sensor <RH> connector terminal No.1 and between A-02 
ASC-ECU connector terminal No.42 and D-133 rear wheel 
speed sensor <RH> connector terminal No.2

• Check for short circuit in rear wheel speed sensor <RH> cir-

cuit

Q: Is the check result normal?

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

P.35C-288

).

NO :  Repair the wiring harness.

STEP 8. Voltage measurement at the A-02 ASC-ECU 
connector
(1) Disconnect the ASC-ECU connector, connect special tool 

ASC check harness (MB991997) to the ASC-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 wheel speed sensor 

power supply terminal (signal terminal) No.43 and body 
ground, and between the ground terminal No.42 and body 
ground.

OK:

Terminal No.43 and body ground: Approximately 

system voltage

Terminal No.42 and body ground: 1 volt or less

Q: Is the check result normal?

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

AC611138AN

ASC-ECU

MB991997

A-02 ASC-ECU 
harness connector

Check harness

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-42

STEP 9. Wiring harness check between A-02 ASC-ECU 
connector terminal No.43 and D-133 rear wheel speed 
sensor <RH> connector terminal No.1 and between A-02 
ASC-ECU connector terminal No.42 and D-133 rear wheel 
speed sensor <RH> connector terminal No.2.

• Check for open circuit in rear wheel speed sensor <RH> cir-

cuit

Q: Is the check result normal?

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

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

P.35C-289

.

Q: Is the check result normal?

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

P.35C-288

).

STEP 11. Connector check: A-02 ASC-ECU connector, 
D-133 rear wheel speed sensor <RH> connector
Q: Is the check result normal?

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

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

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

Q: Is DTC C102B set?

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

(Refer to 

P.35C-287

).

NO :  Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).