Mitsubishi Outlander GS45X. Manual - part 399

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-23

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 C100A set?

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

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

P.35C-270

).

• Item No.01: FL 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.

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.45 and the body 
ground and between the wheel speed sensor ground 
terminal No.46 and the body ground.

OK: 1Volt or less

Q: Is the check result normal?

YES : Go to Step 5.
NO (Not normal at the terminal No.45 or 46) : Go to Step 

6.

AC611137BC

ASC-ECU

MB991997

A-02 ASC-ECU 
harness connector

Check harness

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-24

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.45 and the body 
ground and between the wheel speed sensor ground 
terminal No.46 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.45 or 46) : Go to Step 

6.

STEP 6. Connector check: A-02 ASC-ECU connector, A-11 
front wheel speed sensor <LH> 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.45 and A-11 front wheel speed 
sensor <LH> connector terminal No.1 and between A-02 
ASC-ECU connector terminal No.46 and A-11 front wheel 
speed sensor <LH> connector terminal No.2.

• Check for short circuit in front wheel speed sensor <LH> cir-

cuit

Q: Is the check result normal?

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

P.35C-288

).

NO :  Repair the wiring harness.

AC611137BD

ASC-ECU

MB991997

A-02 ASC-ECU 
harness connector

Check harness

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-25

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.45 and body 
ground, and between the ground terminal No.46 and body 
ground.

OK:

Terminal No.45 and body ground: Approximately 

system voltage

Terminal No.46 and body ground: 1 volt or less

Q: Is the check result normal?

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

STEP 9. Wiring harness check between A-02 ASC-ECU 
connector terminal No.45 and A-11 front wheel speed 
sensor <LH> connector terminal No.1 and between A-02 
ASC-ECU connector terminal No.46 and A-11 front wheel 
speed sensor <LH> connector terminal No.2.

• Check for open circuit in front wheel speed sensor <LH> 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 <FL> 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 <FL> (Refer to 

P.35C-288

).

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

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

AC611138AK

ASC-ECU

MB991997

A-02 ASC-ECU 
harness connector

Check harness

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-26

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 C100A 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

).

DTC C1015 Abnormality in FR wheel speed sensor circuit

Wheel Speed Sensor Circuit

ASC-ECU

FRONT 
WHEEL 
SPEED 
SENSOR 
(LH)

FRONT 
WHEEL 
SPEED 
SENSOR 
(RH)

REAR 
WHEEL 
SPEED 
SENSOR 
(LH)

REAR 
WHEEL 
SPEED 
SENSOR 
(RH)