Mitsubishi Evolution X. Manual - part 807

 

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Mitsubishi Evolution X. Manual - part 807

 

 

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-235

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

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-14

.) 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-20

.)

NO :  Go to Step 3.

STEP 3. ASC OFF switch check
Refer to 

P.35C-271

.

Q: Is the check result normal?

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

P.35C-271

.) 

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.

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-236

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 power supply 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.

STEP 6. Scan tool diagnostic trouble code for other 
systems
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-45

.) 

Then go to Step 9.

NO :  Go to Step 7.

STEP 7. Scan tool diagnostic trouble code for other 
systems
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-591

.) 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-272

.) 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 SKID CONTROL SYSTEM (ASC)

35C-237

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

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.

• Whenever the ECU is replaced, ensure that the CAN 

bus lines are normal.

.

SYSTEM OPERATION

• The ETACS-ECU terminal No. 15 is grounded when the 

ASC OFF switch is pressed. The ON/OFF status of ASC 
OFF switch is sent from ETACS-ECU to ASC-ECU via CAN 
bus line.

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

tem is turned OFF.

• When the ASC OFF switch is pressed and held for 15 sec-

onds or more, the ASC OFF indicator light is turned off, and 
the ASC system is turned ON.

.

TECHNICAL DESCRIPTION (COMMENT)

In the case of this trouble symptom, there may be an open cir-
cuit to the ASC OFF switch circuit.

.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• ASC OFF switch malfunction

• ETACS-ECU malfunction

• Combination meter malfunction

AC708972AQ

Connector: C-313

ETACS-ECU

C-313 (BR)

AC708950

Connector: C-42

AU

AC708950

Connector: C-135

AT

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-238

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-14

.) After repairing the CAN 

bus line, go to Step 8.

STEP 2. ASC OFF switch check
Refer to 

P.35C-271

.

Q: Is the check result normal?

YES : Go to Step 3.
NO :  Replace the ASC OFF switch. (Refer to 

P.35C-271

.) 

Then, go to Step 8.

STEP 3. 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 4.
NO :  Repair the defective connector.

STEP 4. Wiring harness check between C-313 ETACS-ECU 
connector terminal No. 15 and C-135 ASC OFF switch 
connector terminal No. 1

• Check the power supply circuit for open circuit.

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Repair the wiring harness between C-313 

ETACS-ECU connector terminal No. 15 and C-135 
ASC OFF switch connector terminal No. 1.

STEP 5. Wiring harness check between C-135 ASC OFF 
switch connector terminal No. 2 and the body ground

• Open circuit check of the ground circuit

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Repair the wiring harness between C-135 ASC OFF 

switch connector terminal No. 2 and the body ground.

 

 

 

 

 

 

 

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