Mitsubishi Evolution X. Manual - part 808

 

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Mitsubishi Evolution X. Manual - part 808

 

 

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-239

STEP 6. Retest the system.
Q: Does ASC turn ON and OFF normally using the ASC 

OFF switch?
YES : 
Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

NO :  Replace the ETACS-ECU. (Refer to GROUP 54A 

− 

ETACS-ECU 

P.54A-676

.) Then, go to Step 7.

STEP 7. Retest the system.
Q: Does ASC turn ON and OFF normally using the ASC 

OFF switch?
YES : 
The procedure is complete.
NO :  Replace the combination meter. (Refer to GROUP 

54A 

− Combination Meter 

P.54A-101

.) Then, go to 

Step 8.

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

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

Inspection Procedure 9: Abnormality in brake operation

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.

• 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-266

P.35C-267

P.35C-268

, and 

P.35C-269

.)

.

TECHNICAL DESCRIPTION (COMMENT)

Although it is difficult to determine the trouble cause since it 
depends on the running status and road surface condition, a 
malfunction of hydraulic circuit may be present if no diagnostic 
trouble code is detected.

.

PROBABLE CAUSES

• Malfunction of hydraulic unit (integrated with ABS-ECU)

• Malfunction of hydraulic circuit

• Malfunction of brake assembly

• Malfunction of brake booster

• Malfunction of master cylinder assembly

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-240

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. Check the DTC.
Using scan tool, check the diagnostic trouble code for ASC sys-
tem. (Refer to 

P.35C-20

.)

Q: Is the check result normal?

YES : Go to Step 2.
NO :  Carry out the diagnosis for DTC. (Refer to 

P.35C-20

.)

STEP 2. Hydraulic unit (integrated with ASC-ECU) check
Check that the brake tube is correctly mounted to the hydraulic 
unit (integrated with ASC-ECU). (Refer to 

P.35C-263

.)

Q: Is the check result normal?

YES : Go to Step 3.
NO :  Connect the brake tubes correctly, and repair or 

replace the external brake lines of the hydraulic unit 
(integrated with ASC-ECU).

STEP 3. Brake operation check
Perform the following checks.

• Brake pedal check (Refer to GROUP 35A − On-vehicle Ser-

vice, Brake Pedal Chec

P.35A-12

.)

• Brake booster check (Refer to GROUP 35A − On-vehicle 

Service, Brake Booster Operation Chec

P.35A-15

.)

• Check valve check (Refer to GROUP 35A − On-vehicle Ser-

vice, Check Valve Operation Check 

P.35A-16

.)

Q: Can any fault be found with the brake operation?

YES : Check the brake-related parts, and repair if 

necessary. Then, go to Step 4.

NO :  Go to Step 4.

STEP 4. Hydraulic unit check
Perform the following actuator tests. (Refer to 

P.35C-257

.)

• Item 01: FL wheel ABS drive

• Item 02: FR wheel ABS drive

• Item 03: RL wheel ABS drive

• Item 04: RR wheel ABS drive

• Item 05: FL wheel TCL drive

• Item 06: FR wheel TCL drive

• Item 07: RL wheel TCL drive

• Item 08: RR wheel TCL drive

Q: Is the check result normal?

YES : The procedure is complete.
NO :  Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-272

.)

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-241

Inspection Procedure 10: Skid control/TCL does not operate.

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.

• 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-266

P.35C-267

P.35C-268

, and 

P.35C-269

.)

.

TECHNICAL DESCRIPTION (COMMENT)

In case of this trouble symptom, the operation of skid con-
trol/TCL system may be disabled. In this case, a diagnostic 
trouble code may be set by the skid control/TCL system using 
the scan tool.

.

PROBABLE CAUSES

• Low battery output

• Wiring harness or connector failure of CAN bus line

• ASC-ECU malfunction

• Different ETACS-ECU, abnormal variant coding information

• Abnormal engine coding data

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. Check the DTC.
Using scan tool, check the diagnostic trouble code for ASC sys-
tem. (Refer to 

P.35C-20

.)

Q: Is the check result normal?

YES : Go to Step 2.
NO :  Carry out the diagnosis for the DTC. (Refer to 

P.35C-20

.)

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-242

STEP 2. Engine control module coding data check
Using the scan tool, check if there is any abnormality to the fol-
lowing coding data stored in the engine control module. (Refer 
to GROUP 00 

− Coding Table 

P.00-39

.)

A.S.C.

OK: Present

Q: Is the check result normal?

YES : Go to Step 3.
NO :  Replace the engine control module. (Refer to GROUP 

13A 

− Engine Control Module 

P.13A-920

.) Then go to 

Step 4.

STEP 3. Hydraulic unit (integrated with ASC-ECU) check
Check that the brake tube is correctly mounted to the hydraulic 
unit (integrated with ASC-ECU). (Refer to 

P.54A-582

.)

Q: Is the check result normal?

YES : Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-263

.) Then go to Step 4.

NO :  Connect the brake tubes correctly, and repair or 

replace the external brake lines of the hydraulic unit 
(integrated with ASC-ECU).

STEP 4. Operation check
Q: Does the skid control/TCL operate normally?

YES : The procedure is complete.
NO :  Check the brake related components other than the 

skid control/TCL.

 

 

 

 

 

 

 

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