Mitsubishi Outlander GS45X. Manual — part 458

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-259

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect diagnostic trouble code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C

− CAN Bus Line Diagnostic Flow

P.54C-10

).

• Whenever ECU is replaced, ensure that the CAN bus

lines are normal.

• When the steering wheel sensor is replaced, always

carry out calibration to make ASC-ECU learn the neu-
tral point (Refer to

P.35C-283

).

.

OPERATION

• Steering wheel sensor contains the power supply circuit

(terminal No.2) for Steering wheel sensor. The power is
supplied from the ETACS-ECU (terminal No.5). The power
is supplied from the fusible link No.34 through the multi-pur-
pose fuse No.12.

• When malfunction occurs in Steering wheel sensor power

supply, the communication with scan tool becomes unavail-
able.

.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Fuse and fusible link malfunction

• Improper tightening of battery terminal

• Battery failure

• Charging system failed

• Steering wheel sensor malfunction

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. Connector check: C-209 steering wheel sensor
connector
Q: Is the check result normal?

YES : Go to Step 2.
NO : Repair the damaged connector.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-260

STEP 2. Resistance measurement at C-209 steering wheel
sensor connector.
(1) Disconnect C-209 steering wheel sensor connector and

measure the resistance available at the wiring harness side
of the connector.

(2) Check for continuity between C-209 steering wheel sensor

connector terminal No.5 and body ground.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES : Go to Step 4.
NO : Go to Step 3.

STEP 3. Check the wiring harness between C-209 steering
wheel sensor connector terminal No.5 and the body
ground.

• Check the ground wires for open circuit.

Q: Is the check result normal?

YES : If a trouble is solved, it is determined that there is an

intermittent malfunction such as poor engaged
connector(s) or open circuit (Refer to GROUP 00

−

How to use Troubleshooting/How to Cope with
Intermittent Malfunctions

P.00-15

).

NO : Repair the wiring harness.

STEP 4. Connector check: C-309 ETACS-ECU connector,
C-317 ETACS-ECU connector
Q: Is the check result normal?

YES : Go to Step 5.
NO : Repair the damaged connector.

STEP 5. Voltage measurement at C-309 ETACS-ECU
connector
(1) Disconnect C-306 ETACS-ECU connector and measure the

voltage available at the wiring harness side of the
connector.

(2) Measure the voltage between C-309 ETACS-ECU

connector terminal No.1 and body ground.

OK: Approximately system voltage

Q: Is the check result normal?

YES : Go to Step 7.
NO : Go to Step 6.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-261

STEP 6. Check the wiring harness between fusible link No.
34 and C-309 ETACS-ECU connector terminal No.1.

• Check the power supply lines (battery power supply) for

open circuit and short circuit.

Q: Is the check result normal?

YES : If a trouble is solved, it is determined that there is an

intermittent malfunction such as poor engaged
connector(s) or open circuit (Refer to GROUP 00

−

How to use Troubleshooting/How to Cope with
Intermittent Malfunctions

P.00-15

).

NO : Repair the wiring harness.

STEP 7. Measure the voltage at the C-209 steering wheel
sensor connector.
(1) Disconnect C-209 steering wheel sensor connector and

measure the voltage at the wiring harness side of the
connector.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the terminal No.2 and the

body ground.

OK: Approximately system voltage

Q: Is the check result normal?

YES : Go to Step 10.
NO : Go to Step 8.

STEP 8. Check the fuse No.12.
Visually check for open circuit in fuse No.12.
Q: Is the check result normal?

YES : Go to Step 9.
NO : The short circuit may be present in the power supply

circuit. Check the wiring harness between the C-209
steering wheel sensor connector terminal No.2 and
the C-317 ETACS-ECU connector terminal No.5, and
repair if necessary. And then replace the fuse No.12.

STEP 9. Check the wiring harness between C-209 steering
wheel sensor connector terminal No.2 and C-317
ETACS-ECU connector terminal No.5.

• Check the power supply lines (battery power supply) for

open circuit.

Q: Is the check result normal?

YES : Go to Step 10.
NO : Repair the wiring harness between the C-209 steering

wheel sensor connector terminal No.2 and the C-317
ETACS-ECU connector terminal No.5.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-262

STEP 10. Using scan tool MB991958, check the ETACS
system data list
Check the input signal of IG1 relay.

• Turn the ignition switch to the ON position.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : Replace the steering wheel sensor.
NO : Refer to GROUP 54A - ETACS

− Input Signal

Procedures/Input Signal Procedure 2 "The ignition
switch (IG1) signal is not received"

P.54A-786

.

Inspection Procedure 15: HSA (Hill Start Assist) does not work.

Item No.

Item name

Normal
condition

Item 254

IG voltage

System voltage

G and Yaw Rate Sensor Circuit

ASC-ECU

G AND YAW
RATE SENSOR

ACA02068

AC901112

Connector: A-02

A-02 (B)

AF

AC901076AU

Connector: C-26

C-26 (B)