Mitsubishi Outlander (2013+). Manual - part 475

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-75

Inspection Procedure 9: The stability control/TCL system cannot be disabled when ASC OFF switch 
is pressed for 3 seconds or more to turn the system OFF.

CAUTION

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

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

− CAN Bus Diagnostics 

Table ).

• Whenever ECU is replaced, ensure that the 

CAN bus lines are normal.

OPERATION

• ETACS-ECU (ASCS terminal) is earthed by 

pressing ASC OFF switch. The ON/OFF state of 
ASC OFF switch is transferred from ETACS-ECU 
to ASC-ECU via CAN bus line.

• When the ASC OFF switch is pressed for 3 sec-

onds or more, the ASC system turns OFF.

• When the ASC OFF switch is pressed and held 

for 15 seconds or more, ASC turns ON.

COMMENTS ON TROUBLE SYMPTOM

This may be caused by the open and short circuit in 
the ASC OFF switch circuit.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• ASC OFF switch malfunction 

• Malfunction of ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to step2.

NO : 

Repair the CAN bus lines (Refer to GROUP 
54C 

− CAN Bus Diagnostics Table ).

STEP 2. M.U.T.-III data list for other system
Check the ETACS-ECU system data list.

•

Item No.

Item name Normal condition

281

ASC/TCL 
OFF switch

ON

ASC OFF switch: During ON operation

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to GROUP 54A 

− ETACS, Inspection 

Procedure 15 "The ASC OFF switch signal 
is not received." .

STEP 3. Retest the system.

Q: Does ASC turn ON and OFF normally using ASC 

OFF switch?
YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use Troubleshooting/How to 

Cope with Intermittent Malfunction ).

NO : 

Replace the ETACS-ECU (Refer to GROUP 
54A 

− ETACS-ECU ). Then go to Step 4.

STEP 4. Retest the system.

Q: Does ASC turn ON and OFF normally using ASC 

OFF switch?
YES : 

This diagnosis is complete.

NO : 

Return to Step 1.

Inspection Procedure 10: Abnormality in brake operation

CAUTION

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

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

− CAN Bus Diagnostics 

Table ).

• 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 steering wheel sensor, the G 
and yaw rate sensor and brake fluid pressure 

sensor (Refer to 

P.35C-93

, 

P.35C-94

 and 

P.35C-94

).

COMMENTS ON TROUBLE SYMPTOM

Although the cause of the trouble cannot be clearly 
resolved since it depends on the running status and 
road surface condition, the malfunction of the 
hydraulic circuit may occur if any diagnosis code is 
not detected.

PROBABLE CAUSES

• Hydraulic unit (Integrated with ASC-ECU) mal-

function

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-76

• Malfunction of hydraulic circuit

• Malfunction of brake assembly

• Malfunction of brake booster

• Malfunction of master cylinder assembly

DIAGNOSIS PROCEDURE

STEP 1. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the 
ASC system. (Refer to 

P.35C-15

.)

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Troubleshoot for the relevant diagnosis 
code (Refer to 

P.35C-15

).

STEP 2. Hydraulic unit (Integrated with 
ASC-ECU) check
Check that the brake tube is installed to the hydraulic 
unit (integrated with ASC-ECU) correctly (Refer to 

P.35C-90

).

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Connect the brake tubes correctly, repair the 
external brake lines, or replace the hydraulic 
unit (integrated with ASC-ECU) (Refer to 

P.35C-95

).

STEP 3. Brake operation check
Perform the following checks.

• Brake pedal check (Refer to GROUP 35A − 

On-vehicle Service/Brake Pedal Check ).

• Brake booster check (Refer to GROUP 35A − 

On-vehicle Service/Brake Booster Operating 
Check ).

• Check valve check (Refer to GROUP 35A − 

On-vehicle Service/Check Valve Operation 
Check ).

Q: Can any fault be found with the brake operation?

YES : 

Check the brake-related parts, and repair if 

necessary. Then, go to Step 4.

NO : 

Go to Step 4.

STEP 4. Hydraulic unit check
Perform the following actuator tests (Refer to 

P.35C-87

).

• Item No.01: FL wheel ABS drive

• Item No.02: FR wheel ABS drive

• Item No.03: RL wheel ABS drive

• Item No.04: RR wheel ABS drive

• Item No.05: FL wheel TCL drive

• Item No.06: FR wheel TCL drive

• Item No.07: RL wheel TCL drive

• Item No.08: RR wheel TCL drive

Q: Is the check result normal?

YES : 

This diagnosis is complete.

NO : 

Replace the hydraulic unit (integrated with 
ASC-ECU) (Refer to 

P.35C-95

).

Inspection Procedure 11: ASC does not operate or faulty ASC operate.

CAUTION

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

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

− CAN Bus Diagnostics 

Table ).

• 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 steering wheel sensor, the G 
and yaw rate sensor and brake fluid pressure 
sensor (Refer to 

P.35C-93

, 

P.35C-94

 and 

P.35C-94

).

COMMENTS ON TROUBLE SYMPTOM

In case of this trouble symptom, the stability con-
trol/TCL system operation may be disabled. Diagno-

sis code may be set by the stability control/TCL 
system using M.U.T.-III.

PROBABLE CAUSES

• Low battery output

• Wiring harness or connector failure of CAN bus 

line

• ASC-ECU malfunction

• Engine coding data problem

DIAGNOSIS PROCEDURE

STEP 1. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the 
ASC system (Refer to 

P.35C-15

).

Q: Is the check result normal?

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-77

YES : 

Go to Step 2.

NO : 

Carry out the diagnosis for the diagnosis 
code (Refer to 

P.35C-15

).

STEP 2. Engine ECU coding data check
Using M.U.T.-III, check if any abnormality is present 
to the coding data below which are stored in the 
engine-ECU (Refer to GROUP 00 

− Precautions 

before Service/Coding List ).

A.S.C.

OK: Available

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3 .

STEP 3. Engine ECU coding data check
Perform the variant coding to the Engine ECU.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the engine ECU (Refer to GROUP 
13A 

− Engine-ECU ). Then go to Step 5.

STEP 4. Hydraulic unit (integrated with 
ASC-ECU) check
Check that the brake tube is correctly mounted to the 
hydraulic unit (integrated with ASC-ECU) (Refer to 

P.35C-90

).

Q: Is the check result normal?

YES : 

Replace the hydraulic unit (integrated with 

ASC-ECU) (Refer to 

P.35C-90

). Then go to 

Step 5.

NO : 

Connect the brake tubes correctly, and 
repair or replace the external brake lines of 
the hydraulic unit (integrated with 
ASC-ECU).

STEP 5. Operation check

Q: Does stability control/TCL operate normally?

YES : 

This diagnosis is complete.

NO : 

Check the brake system related 
components other than the stability 
control/TCL system.

Inspection Procedure 12: ASC-ECU power supply circuit system.

CAUTION

• When the ASC-ECU power supply voltage 

becomes 9.7 

± 0.3 V or less, the ABS warning 

lamp, ASC warning display, and ASC OFF dis-
play illuminate, and the ABS, stability control, 
and TCL controls are prohibited.

• If the battery terminal is not tightened prop-

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

− CAN Bus Diagnostics 

Table ).

• 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 steering wheel sensor, the G 
and yaw rate sensor and brake fluid pressure 
sensor (Refer to 

P.35C-93

, 

P.35C-94

 and 

P.35C-94

).

OPERATION

• ASC-ECU contains the power supply circuit (+BV 

terminal) 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 (IG1 

terminal) 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.

• ASC-ECU contains the power supply circuit (+BM 

terminal) for the pump motor. The pump motor is 
energised by the motor switch, which is incorpo-
rated in ASC-ECU.

• When malfunction occurs in ASC-ECU power 

supply, the communication with M.U.T.-III 
becomes unavailable.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Fusible link malfunction

• Improper tightening of battery terminal

• Improper tightening of earth bolt

• Battery failure

• Charging system failed

• ASC-ECU malfunction

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-78

DIAGNOSIS PROCEDURE

STEP 1. Battery check
Refer to GROUP 54A 

− Battery Test .

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/Alternator 

Output Line Voltage Drop Test .

Q: Is the charging system in good condition?

YES : 

Go to Step 3.

NO : 

Repair or replace the charging system 
component(s).

STEP 3. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the ETACS-ECU.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the ETACS. Refer to GROUP 

54A - ETACS .

NO : 

Go to Step 4.

STEP 4. Voltage measurement at the ASC-ECU 
connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the voltage between ASC-ECU 

connector (+BV terminal) and body earth.

OK: Approximately system voltage

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

STEP 5. Check of short to power supply, short to 
earth, and open circuit in +BV line between 
fusible link and ASC-ECU connector

Q: Is the check result normal?

YES : 

Intermittent malfunction is suspected (Refer 

to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

NO : 

Repair the fusible link, connector(s) or 
wiring harness. Then go to Step 13.

STEP 6. Voltage measurement at the ASC-ECU 
connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the voltage between ASC-ECU 

connector (+BM terminal) and body earth.

OK: Approximately system voltage

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 7.

STEP 7. Check of short to power supply, short to 
earth, and open circuit in +BM line between 
fusible link and ASC-ECU connector

Q: Is the check result normal?

YES : 

Intermittent malfunction is suspected (Refer 

to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

NO : 

Repair the fusible link, connector(s) or 
wiring harness. Then go to Step 13.

STEP 8. Voltage measurement at the ASC-ECU 
connector.
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between ASC-ECU 

connector (IG1 terminal) and body earth.

OK: Approximately system voltage

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Go to Step 9.

STEP 9. Check of short to power supply, short to 
earth, and open circuit in IG1 line between 
ETACS-ECU and ASC-ECU connector

Q: Is the check result normal?

YES : 

Intermittent malfunction is suspected (Refer 

to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

NO : 

Repair the connector(s) or wiring harness. 
Then go to Step 13.

STEP 10. Resistance measurement at ASC-ECU 
connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Resistance between the ASC-ECU connector 

(GND1 terminal) and the body earth, and 
between the ASC-ECU connector (GND2