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

TSB Revision

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

TSB Revision

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)