Mitsubishi Outlander GS45X. Manual - part 450

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-227

STEP 7. Retest the system.
Q: Does the ABS warning light turn ON and OFF normally?

YES : Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

NO :  Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

), and then go to Step 8.

STEP 8. Retest the system.
Q: Does the ABS warning light turn ON and OFF normally?

YES : The procedure is complete.
NO :  Return to Step 1.

Inspection Procedure 5: Brake warning light does not illuminate when the ignition switch is turned to 
ON position (engine stopped).

CAUTION

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

rect DTC 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 sends the illumination request signal of the break 

warning light to the combination meter through 
ETACS-ECU via the CAN communication.

• ASC-ECU illuminates brake warning light via ETACS-ECU 

for approximately 3 seconds for bulb check with the ignition 
switch turned to the ON position.

.

COMMENTS ON TROUBLE SYMPTOM

This may be caused by faults in the CAN bus line, 
ETACS-ECU, combination meter or ASC-ECU.

.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Malfunction of ETACS-ECU

• Malfunction of the combination meter

• ASC-ECU malfunction

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-228

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

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 2.
NO :  Repair the CAN bus lines (Refer to GROUP 54C 

− 

CAN Bus Diagnostics Table 

P.54C-17

). Then go to 

Step 7.

STEP 2. Using scan tool MB991958, check the DTC
Use scan tool to check the DTC for the ASC system.
Q: Is the DTC set?

YES : Carry out the diagnosis for the DTC (Refer to 

P.35C-18

).

NO :  Go to Step 3.

STEP 3. Actuator test of combination meter
Perform the following actuator test by the combination meter 
system, and check if the brake warning light illuminates (Refer 
to GROUP 54A 

− Combination Meter/Actuator Test Table 

P.54A-91

, 

P.54A-91

).

• Item No.07: Indicator 1

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Diagnose the combination meter (Refer to GROUP 

54A 

− Combination Meter/Trouble Symptom Chart 

P.54A-69

). Then go to Step 7.

STEP 4. Using scan tool MB991958, check the other 
system DTC
Using scan tool, check that DTC U0141 is not set by the combi-
nation meter system.
Q: Is the DTC set?

YES : Diagnose the combination meter (Refer to GROUP 

54A 

− Combination Meter/DTC 

P.54A-53

). Then go to 

Step 7.

NO :  Go to Step 5.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-229

STEP 5. Using scan tool MB991958, check the other 
system DTC
Using scan tool, check that DTC U0121 is not set by the 
ETACS system.
Q: Is the DTC set?

YES : Perform troubleshooting on ETACS-ECU (Refer to 

GROUP 54A 

− ETACS/DTC 

P.54A-741

). Then go to 

Step 7.

NO :  Go to Step 6.

STEP 6. Retest the system.
Q: Does the brake warning light turn ON and OFF

YES : Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

NO :  Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

), and then go to Step 7.

STEP 7. Retest the system.
Q: Does the brake warning light turn ON and OFF 

normally?
YES : The procedure is complete.
NO :  Return to Step 1.

Inspection Procedure 6: ABS warning light stays ON after the engine is started.

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 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

).

.

SYSTEM OPERATION

• ASC-ECU sends the illumination request signal of the ABS 

warning light to the combination meter through 
ETACS-ECU via CAN communication.

• ASC-ECU illuminates the ABS warning light via 

ETACS-ECU for approximately 3 seconds for valve check 
with the ignition switch turned to the ON position.

.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-230

TECHNICAL DESCRIPTION (COMMENT)

This may be caused by faults in the CAN bus line, 
ETACS-ECU, combination meter or ASC-ECU.

.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• ETACS-ECU malfunction

• Combination meter malfunction

• ASC-ECU malfunction

• Control stop due to the low voltage

NOTE: Due to the abnormality in the supply voltage, the 
diagnostic trouble code may not be set even when the ABS 
warning light is illuminated.

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

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 2.
NO :  Repair the CAN bus lines (Refer to GROUP 54C 

− 

CAN Bus Diagnostics Table 

P.54C-17

). Then go to 

Step 8.

STEP 2. Using scan tool MB991958, check the DTC
Use scan tool to check the DTC for the ASC system.
Q: Is the DTC set?

YES : Carry out the diagnosis for the DTC (Refer to 

P.35C-18

).

NO :  Go to Step 3.

STEP 3. Actuator test of combination meter
Perform the following actuator test by the combination meter 
system, and check if the ABS warning light illuminates normally 
(Refer to GROUP 54A 

− Combination Meter/Actuator Test 

Table 

P.54A-91

, 

P.54A-91

).

• Item No.07: Indicator 1

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Replace the combination meter (Refer to GROUP 

54A 

− Combination Meter 

P.54A-118

). Then go to 

Step 8.