Mitsubishi Evolution X. Manual — part 807
DIAGNOSIS
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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
.) 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
.)
NO : Go to Step 3.
STEP 3. ASC OFF switch check
Refer to
.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the ASC OFF switch (Refer to
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
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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, Troubleshooting
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
.) 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
.)
NO : Replace the hydraulic unit (incorporates in
.) 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
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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
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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
.) After repairing the CAN
bus line, go to Step 8.
STEP 2. ASC OFF switch check
Refer to
.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the ASC OFF switch. (Refer to
.)
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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