Mitsubishi Evolution X. Manual - part 786

 

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Mitsubishi Evolution X. Manual - part 786

 

 

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-151

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

.)

.

CIRCUIT OPERATION

• ASC-ECU contains the power supply circuit (terminal No. 

32) for the solenoid valve. The solenoid valve is energized 
by the valve relay, which is incorporated in ASC-ECU.

• ASC-ECU contains the power supply circuit (terminal No. 2) 

for ASC-ECU, and the power is supplied from the fusible 
link No. 34 through the multi-purpose fuse No. 17.

• The valve relay in ASC-ECU is energized at all times, and 

the solenoid valve is always energized while the system is 
in operation unless the initial check is in progress when the 
ignition switch is turned ON, or unless the periodical system 
check is in progress.

.

DTC SET CONDITIONS

This diagnostic trouble code is set when the ASC-ECU power 
supply voltage and solenoid valve power supply voltage 
become 18.0 

± 1.0 V or higher.

.

PROBABLE CAUSES

• Battery failure

• Battery terminal looseness

• Fusible link malfunction

• Damaged wiring harness and connectors

• ASC-ECU malfunction

• Charging system failed

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

• MB991997: ASC check harness

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-152

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 3.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C 

− 

Troubleshooting 

P.54C-14

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. DTC recheck after repairing the CAN bus line
Q: Is DTC C2101 set?

YES : Go to Step 3.
NO :  The procedure is complete.

STEP 3. Battery terminal check
Check that the battery terminal is not loose.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Securely install the battery terminal. Then go to Step 

4.

STEP 4. Battery check
Refer to GROUP 54A 

− Battery Test 

P.54A-9

.

Q: Is the battery in good condition?

YES : Go to Step 6.
NO :  Charge or replace the battery, and then go to Step 5.

STEP 5. Charging system check
Refer to GROUP 16 

− Charging System 

P.16-7

.

Q: Is the charging system in good condition?

YES : Go to Step 6.
NO :  Repair or replace the charging system component(s).

STEP 6. Fusible link check: Check the fusible link No.27 
and No.34.
Check that the fusible link No. 27 and No. 34 are normal and 
does not exceed the capacity.
Q: Is the check result normal?

YES : Go to Step 7.
NO :  Replace the fusible link No.27 or No.34.

STEP 7. Connector check: A-05 ASC-ECU connector
Q: Is the check result normal?

YES : Go to Step 8.
NO  :  Repair the defective connector.

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-153

STEP 8. Voltage measurement at the A-05 ASC-ECU 
connector
(1) Disconnect the connector, connect the ASC check harness 

(Special tool: MB991997) to the wiring harness-side 
connector, and measure the voltage at the special tool 
connector side.
NOTE: Do not connect the special tool to ASC-ECU.

(2) Measure the voltage between the terminal No. 32 and the 

body ground.

OK: System voltage

Q: Is the check result normal?

YES : Go to Step 9.
NO :  Repair the wiring harness between A-05 ASC-ECU 

connector terminal No. 32 and the fusible link No. 27.

STEP 9. Check of fuse No. 17
Check that the fuse No. 17 is normal and does not exceed the 
capacity.
Q: Is the check result normal?

YES : Go to Step 10.
NO :  Replace the fuse No. 17.

STEP 10. Connector check: C-309 ETACS-ECU connector 
and C-315 ETACS-ECU connector
Q: Is the check result normal?

YES : Go to Step 11.
NO  :  Repair the defective connector.

STEP 11. Voltage measurement at the C-309 ETACS-ECU 
connector
(1) Disconnect the connector, and measure at the wiring 

harness-side connector.

(2) Measure the voltage between the terminal No. 1 and the 

body ground.

OK: System voltage

Q: Is the check result normal?

YES : Go to Step 12.
NO :  Repair the wiring harness between C-309 

ETACS-ECU connector terminal No. 1 and the fusible 
link No. 34.

AC400817CN

ASC-ECU

MB991997

A-05 ASC-ECU 
harness connector

Check harness

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-154

STEP 12. Voltage measurement at the C-315 ETACS-ECU 
connector
(1) Without disconnecting the connector, measure by 

backprobing.

(2) Measure the voltage between the terminal No. 4 and the 

body ground.

OK: System voltage

Q: Is the check result normal?

YES : Go to Step 13.
NO :  Replace the ETACS-ECU. (Refer to GROUP 54A 

− 

ETACS-ECU 

P.54A-676

.) Then go to Step 17.

STEP 13. Connector check: C-103 joint connector, C-130 
intermediate connector
Q: Is the check result normal?

YES : Go to Step 14.
NO  :  Repair the defective connector.

STEP 14. Voltage measurement at the A-05 ASC-ECU 
connector
(1) Disconnect the connector, connect the ABS check harness 

(Special tool: MB991997) to the wiring harness-side 
connector, and measure the voltage at the special tool 
connector side.
NOTE: Do not connect the special tool to ASC-ECU.

(2) Measure the voltage between the terminal No. 2 and the 

body ground.

OK: System voltage

Q: Is the check result normal?

YES : Go to Step 15.
NO :  Repair the wiring harness between C-315 

ETACS-ECU connector terminal No. 4 and A-05 
ASC-ECU connector terminal No. 2.

AC400817CN

ASC-ECU

MB991997

A-05 ASC-ECU 
harness connector

Check harness

 

 

 

 

 

 

 

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