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
.)
NO : Replace the ETACS-ECU. (Refer to GROUP 54A
−
ETACS-ECU
.) 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
.) 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
.)
.
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
.)
Q: Is the check result normal?
YES : Go to Step 2.
NO : Carry out the diagnosis for DTC. (Refer to
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
.)
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 Check
• Brake booster check (Refer to GROUP 35A − On-vehicle
Service, Brake Booster Operation Check
.)
• Check valve check (Refer to GROUP 35A − On-vehicle Ser-
vice, Check Valve Operation Check
.)
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
.)
• 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
.)
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
.)
.
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
.)
Q: Is the check result normal?
YES : Go to Step 2.
NO : Carry out the diagnosis for the DTC. (Refer to
.)
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
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
.) 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
.)
Q: Is the check result normal?
YES : Replace the hydraulic unit (incorporates in
.) 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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