Mitsubishi Outlander GS45X. Manual - part 447

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-215

STEP 6. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.
Q: Is the check result normal?

YES : Go to Step 7.
NO :  Replace the ETACS-ECU (Refer to GROUP 54A 

− 

ETACS-ECU 

P.54A-825

), and then go to Step 7.

STEP 7. Check part number of ASC-ECU
Check the part number of ASC-ECU.
Q: Is the check result normal?

YES : Go to Step 8.
NO :  Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

), and then go to Step 9.

STEP 8. Check whether the diagnostic trouble code is 
reset.
Erase the DTC.
Q: Is DTC U1417 set?

YES : Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

), and then go to Step 9.

NO :  The trouble can be an intermittent malfunction (Refer 

to GROUP 00 

− How to Use Troubleshooting/How to 

Cope with Intermittent Malfunctions 

P.00-15

).

STEP 9. Check whether the diagnostic trouble code is 
reset.
Erase the DTC.
Q: Is DTC U1417 set?

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

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-216

SYMPTOM CHART

M1355006900781

CAUTION

• ASC may operate in the following conditions without hard braking: Low mu road surface, 

high-speed turn, and bumpy road surface. When asking the customers, confirm that they 
have/have not encountered ABS operation in corresponding conditions.

• During ASC operation, the brake pedal is pulled forward gradually, and the noise occurs at the 

same time. This is because the brake line pressure varies intermittently to prevent the wheel lock, 
and not a system malfunction.

CAUTION

During diagnosis, a diagnostic trouble code associated with other system may be set when the igni-
tion switch is turned on with connector(s) disconnected. On completion, confirm all systems for diag-
nostic trouble code(s). If diagnostic trouble code(s) are set, erase them all.

Trouble symptom

Inspection 
procedure 
number

Reference 
page

Scan tool communication with 
ABS/TCL/Skid control system is 
impossible.

Scan tool communication with all 
systems are impossible.

−

Refer to 
GROUP 54C 
− 

Troubleshooti
ng 

P.54C-17

.

Scan tool communication only with 
ABS/TCL/Skid control system is 
impossible.

1

P.35C-217

ASC OFF indicator light flashes at a rate of 2Hz.

2

P.35C-218

Brake warning light stays ON with the parking brake lever released.

3

P.35C-219

ABS warning light does not illuminate when ignition switch is turned to the ON 
position (Engine stopped).

4

P.35C-225

Brake warning light does not illuminate when the ignition switch is turned to 
ON position (Engine stopped).

5

P.35C-227

ABS warning light stays ON after the engine is started.

6

P.35C-229

ASC warning display stays ON after the engine is started.

7

P.35C-232

ASC OFF display or ASC OFF light stays ON after the engine is started.

8

P.35C-234

ASC Operation Display Stays ON after the Engine is Started.

9

P.35C-238

After ASC OFF switch is turned OFF, TCL/Skid control system cannot be 
disabled.

10

P.35C-240

Abnormality in brake operation

11

P.35C-243

ASC system does not operate or faulty ASC operate.

12

P.35C-244

ASC-ECU power supply circuit system

13

P.35C-247

Steering wheel sensor power supply circuit system

14

P.35C-258

HSA (Hill Start Assist) does not work.

15

P.35C-262

HSA (Hill Start Assist) works on a flat road.

16

P.35C-267

The initial check sound of hydraulic unit is loud.

17

P.35C-268

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-217

SYMPTOM PROCEDURES

Inspection Procedure 1: Scan tool communication only with ABS/TCL/Skid control system is 
impossible.

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

).

.

COMMENTS ON TROUBLE SYMPTOM

When scan tool cannot communicate with the ABS/TCL/ASC 
system, the CAN bus line, ASC-ECU power supply circuit sys-
tem, or ASC-ECU may be faulty.

.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• ASC-ECU malfunction

• Wrong routing of scan tool harness

• Abnormality in battery or generator

• Abnormality in power supply voltage to ASC-ECU

• ECU malfunction of other system

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. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Check the power supply circuit, and repair if 

necessary (Refer to 

P.35C-247

).

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

− 

CAN Bus Diagnostics Table 

P.54C-17

).

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-218

Inspection Procedure 2: ASC OFF display flashes at a rate of 2Hz.

.

SYSTEM OPERATION

When ASC OFF display flashes at a rate of 2 Hz, TCL control 
by brake force is prohibited.

.

TECHNICAL DESCRIPTION (COMMENT)

This operation is performed for the following reasons and is not 
a malfunction.

• ASC-ECU calculates the estimated temperature of the 

brake pad. In general, as the brake pad temperature 
increases, the coefficient of friction for the brake pad 
becomes smaller, resulting in the reduced braking force. 
When the estimated temperature of the brake pad reaches 
the specified value or more, ASC-ECU flashes the ASC 
OFF display at a rate of 2 Hz to warn the driver that the 
brake controllability by TCL is decreased by the reduced 
braking force. Consequently, ASC-ECU prohibits the TCL 
control (brake control only) until it determines that the esti-
mated temperature of the brake pad is normal.

NOTE: Besides severe driving, brake pad condition and brake 
drag are also suspected as a cause of overheat. After the ASC 
OFF display illumination turns off, check the brake pad condi-
tion and brake drag.

.

PROBABLE CAUSES

• Overheat of brake pad