Mitsubishi Lancer Evolution X. Manual - part 195

 

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Mitsubishi Lancer Evolution X. Manual - part 195

 

 

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-245

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 7.

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. Check of ASC-ECU power supply circuit
Refer to 

P.35C-258

.

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Carry out the diagnosis of ASC-ECU power supply 

circuit system.(Refer to 

P.35C-258

.)

STEP 4. 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, Troubleshooting 

P.54A-49

.) 

Then go to Step 7.

NO :  Go to Step 5.

STEP 5. 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-646

.) Then go to 

Step 7.

NO :  Go to Step 6.

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-246

STEP 6. Retest the system.
Q: Does the ABS warning light 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 7.

STEP 7. 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 6: The ASC warning display stays ON even after the engine is started.

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

.

TECHNICAL DESCRIPTION (COMMENT)

In the case of this trouble symptom, there may be a malfunction 
to the CAN bus line, ETACS-ECU, combination meter, or 
ASC-ECU.

.

PROBABLE CAUSES

• Damaged wiring harness and connectors
• Malfunction of ETACS-ECU
• 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 ASC 
warning display is illuminated.

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-247

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 7.

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. Check of ASC-ECU power supply circuit
Refer to 

P.35C-258

.

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Carry out the diagnosis of ASC-ECU power supply 

circuit system.(Refer to 

P.35C-258

.)

STEP 4. 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, Troubleshooting 

P.54A-49

.) 

Then go to Step 7.

NO :  Go to Step 5.

STEP 5. 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 7.

NO :  Go to Step 6.

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-248

STEP 6. Retest the system.
Q: Does the ASC warning 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 7.

STEP 7. Retest the system.
Q: Does the ASC warning display turn ON and OFF 

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

Inspection Procedure 7: The ASC OFF display remains illuminated after the engine is started.

ETACS-ECU

ASC 
OFF 
SWITCH

ASC OFF Switch Circuit

 

 

 

 

 

 

 

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