Mitsubishi Lancer Evolution X. Manual - part 196

 

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Mitsubishi Lancer Evolution X. Manual - part 196

 

 

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-249

CAUTION

• Whenever the ECU is replaced, ensure that the CAN 

bus lines are normal.

• When the hydraulic unit (integrated with ASC-ECU) is 

replaced, always perform the calibration of steering 
wheel sensor, G and yaw rate sensor, brake fluid pres-
sure sensor, cut valve, and inlet valve.(Refer to 

P.35C-287

P.35C-289

P.35C-294

, and 

P.35C-295

.)

.

SYSTEM OPERATION

• ASC-ECU sends the illumination request signal of ASC 

OFF display to the combination meter through ETACS-ECU 
via CAN communication.

• By the operation of ASC OFF switch, the ASC OFF display 

illuminates when the ASC function is stopped.

• When the ASC OFF switch is pressed shortly, the ASC sys-

tem is turned OFF.

.

TECHNICAL DESCRIPTION (COMMENT)

In the case of this trouble symptom, there may be a short circuit 
to the ASC OFF switch circuit.

.

PROBABLE CAUSES

• Damaged wiring harness and connectors
• ASC OFF switch malfunction
• ETACS-ECU malfunction
• Combination meter malfunction
• ASC-ECU malfunction

AC708972AQ

Connector: C-313

ETACS-ECU

C-313 (BR)

AC708950

Connector: C-42

AU

AC708950

Connector: C-135

AT

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-250

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.
Using scan tool MB991958, 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 − 

Troubleshooting 

P.54C-15

.) Then go to Step 9.

STEP 2. Scan tool diagnostic trouble code
Using scan tool, check the diagnostic trouble code for ASC sys-
tem.
Q: Is any DTC set?

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

P.35C-22

.)

NO :  Go to Step 3.

STEP 3. ASC OFF switch check
Refer to 

P.35C-297

.

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Replace the ASC OFF switch (Refer to 

P.35C-296

.) 

Then go to Step 9.

STEP 4. Connector check: C-313 ETACS-ECU connector, 
C-42 intermediate connector, C-135 ASC OFF switch 
connector
Q: Is the check result normal?

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

STEP 5. Wiring harness check between C-313 ETACS-ECU 
connector terminal No. 15 and C-135 ASC OFF switch 
connector terminal No. 1

• Short circuit check of the signal line circuit

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Repair the wiring harness between C-313 

ETACS-ECU connector terminal No. 15 and C-119 
ASC OFF switch connector terminal No. 1.

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-251

STEP 6. Scan tool diagnostic trouble code for other 
system
Using scan tool MB991958, check if diagnostic trouble code 
No. U0141 is set by the combination meter system.
Q: Is the DTC set?

YES : Diagnose the combination meter. (Refer to GROUP 

54A − Combination Meter, Troubleshootin

P.54A-49

.) 

Then go to Step 9.

NO :  Go to Step 7.

STEP 7. Scan tool diagnostic trouble code for other 
system
Using scan tool MB991958, check if diagnostic trouble code 
No. U0121 is set by ETACS system.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU (Refer to GROUP 54A − 

ETACS, Troubleshooting 

P.54A-655

.) Then go to 

Step 8.

NO :  Go to Step 8.

STEP 8. Retest the system.
Q: Does the ASC OFF display turn ON and OFF normally?

YES : Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

NO :  Replace the hydraulic unit (incorporates in 

ASC-ECU). (Refer to 

P.35C-298

.) Then go to Step 9.

STEP 9. Retest the system.
Q: Does the ASC OFF display turn ON and OFF normally?

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

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-252

Inspection Procedure 8: After the ASC OFF switch is pressed to turn "OFF," the stability control/TCL 
cannot be cancelled.

ETACS-ECU

ASC 
OFF 
SWITCH

ASC OFF Switch Circuit

AC708972AQ

Connector: C-313

ETACS-ECU

C-313 (BR)

AC708950

Connector: C-42

AU

AC708950

Connector: C-135

AT

 

 

 

 

 

 

 

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