Mitsubishi Outlander GS45X. Manual - part 455

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-247

Inspection Procedure 13: ASC-ECU power supply circuit system

Solenoid Valve, Motor and ASC-ECU Power Supply Circuit

FUSIBLE 
LINK

27

FUSIBLE 
LINK

26

SOLENOID 
VALVE 
POWER 
SUPPLY

MOTOR 
POWER 
SUPPLY

ETACS-
ECU

ASC-ECU

POWER 
SUPPLY

FUSIBLE 
LINK

34

IG1 
RELAY

IGNITION SWITCH

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-248

CAUTION

• When the ASC-ECU power supply voltage becomes 9.7 

± 0.3 V or less, the ABS warning light, ASC warning dis-

play, and ASC OFF display illuminate, and the ABS, sta-
bility control, and TCL controls are prohibited.

• If the battery terminal is not tightened properly, a dump 

surge may occur and the power supply voltage may 
become abnormally high for a short time.

• 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 hydraulic unit (integrated with ASC-ECU) is 

replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake 
fluid pressure sensor (Refer to 

P.35C-282

, 

P.35C-283

 

and 

P.35C-284

).

.

OPERATION

• ASC-ECU contains the power supply circuit (terminal No. 

32) for the solenoid valve. The solenoid valve is energized 
by the valve relay, which is incorporated in ASC-ECU.

• ASC-ECU contains the power supply circuit (terminal No.2) 

for ASC-ECU. The power is supplied from the fusible link 
No.34 through the multi-purpose fuse No.17.

AC901112

Connector: A-02

A-02 (B)

AF

AC901075 AB

Connector: C-33

AC702828AR

Connectors: C-309, C-315, C-317

C-309 (B)

C-315

C-317

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-249

• ASC-ECU contains the power supply circuit (terminal No.8) 

for ASC-ECU. When the ignition switch (IG1) is turned ON, 
the voltage is applied to the relay incorporated in 
ETACS-ECU to turn ON the relay, and the power is supplied 
from the fusible link No.34 through multi-purpose fuse 
No.12.

• ASC-ECU contains the power supply circuit (terminal No.1) 

for the pump motor. The pump motor is energized by the 
motor switch, which is incorporated in ASC-ECU.

• When malfunction occurs in ASC-ECU power supply, the 

communication with scan tool becomes unavailable.

.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Malfunction of fuse or fusible link

• Improper tightening of battery terminal

• Improper tightening of grounding bolt

• Battery failure

• Charging system failed

• ASC-ECU 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. Battery check
Refer to GROUP 54A 

− Battery Test 

P.54A-9

.

Q: Is the battery in good condition?

YES : Go to Step 3.
NO :  Charge or replace the battery. Then go to Step 2.

STEP 2. Charging system check
Refer to GROUP 16 

− On−vehicle Service/Output Current Test 

P.16-9

.

Q: Is the charging system in good condition?

YES : Go to Step 3.
NO :  Repair or replace the charging system component(s).

STEP 3. Connector check: A-02 ASC-ECU connector, C-33 
intermediate connector, C-317 ETACS-ECU connector, 
C-315 ETACS-ECU connector
Q: Is the check result normal?

YES : Go to Step 4.
NO  :  Repair the damaged connector.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-250

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 ASC check harness 
(MB991997) to ASC-ECU.

(2) Measure the voltage between terminal No.32 and body 

ground.

OK: Approximately system voltage

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Go to Step 5.

STEP 5. Fusible link check: Check the fusible link No.27.
Q: Is the check result normal?

YES : The open circuit may be present in the power supply 

circuit. Repair the wiring harness between the A-02 
ASC-ECU connector terminal No.32 and the fusible 
link No.27. Then go to Step 20.

NO :  Go to Step 6.

AC606869ME

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU
harness connector