Mitsubishi Lancer Evolution X. Manual - part 199

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-261

STEP 4. Voltage measurement at 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: Battery positive voltage

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Go to Step 5.

STEP 5. Fusible link check: Check the fusible link No. 27.
Q: Is the check result normal?

YES : An open circuit may be present in the power supply 

circuit. Repair the wiring harness between A-05 
ASC-ECU connector terminal No. 32 and the fusible 
link No. 27.

NO :  Go to Step 6.

STEP 6. Wiring harness check between A-05 ASC-ECU 
connector and fusible link No. 27.
(1) Disconnect ASC-ECU connector A-05.
(2) Remove fusible link No. 27.
(3) Check the continuity (short to ground) between A-05 

ASC-ECU connector terminal No. 32 and the ground.

OK: No continuity

Q: Is the check result normal?

YES : Replace the fusible link No.27.
NO :  Short circuit may be present in the power supply 

circuit. Repair the wiring harness between A-05 
ASC-ECU connector terminal No. 32 and fusible link 
No. 27.

AC400817CN

ASC-ECU

MB991997

A-05 ASC-ECU 
harness connector

Check harness

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-262

STEP 7. Voltage measurement at 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. 1 and the 

body ground.

OK: Battery positive voltage

Q: Is the check result normal?

YES : Go to Step 10.
NO :  Go to Step 8.

STEP 8. Fusible link check: Check the fusible link No.26.
Visually check for open circuit in the fusible link No.26.
Q: Is the check result normal?

YES : An open circuit may be present in the pump motor 

power supply circuit. Repair the wiring harness 
between A-05 ASC-ECU connector terminal No. 1 
and the fusible link No. 26.

NO :  Go to Step 9.

STEP 9. Wiring harness check between A-05 ASC-ECU 
connector and fusible link No. 26.
(1) Disconnect ASC-ECU connector A-05.
(2) Remove fusible link No. 26.
(3) Check the continuity (short to ground) between A-05 

ASC-ECU connector terminal No. 1 and the ground.

OK: No continuity

Q: Is the check result normal?

YES : Replace the fusible link No.26.
NO :  Short circuit may be present in the power supply 

circuit. Repair the wiring harness between A-05 
ASC-ECU connector terminal No. 1 and fusible link 
No. 26.

AC400817CP

ASC-ECU

MB991997

A-05 ASC-ECU 
harness connector

Check harness

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-263

STEP 10. Check of fuse No. 17 and fusible link No. 34
Visually check for open circuit in the fuse No. 17 and the fusible 
link No. 34.
Q: Is the check result normal?

YES : Go to Step 16.
NO :  Go to Step 11.

STEP 11. Connector check: C-41 intermediate connector, 
C-43 joint connector, C-46 ETACS-ECU connector, C-103 
joint connector, C-130 intermediate connector, C-309 
ETACS-ECU connector and C-315 ETACS-ECU connector
Q: Is the check result normal?

YES : Go to Step 12.
NO :  Repair the connector. Then, replace fuse No. 17 or 

fusible link No. 34.

STEP 12. Wiring harness check between C-309 
ETACS-ECU connector and fusible link No. 34.
(1) Remove fusible link No. 34.
(2) Disconnect ETACS-ECU connector C-309, and measure at 

the wiring harness side.

(3) Check the continuity (short to ground) between terminal No. 

1 and the ground.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 13.
NO :  Repair the wiring harness between C-309 

ETACS-ECU connector terminal No. 1 and fusible link 
No. 34. Then, replace fuse No. 17 or fusible link No. 
34.

STEP 13. Wiring harness check between C-315 
ETACS-ECU connector and C-103 joint connector.
(1) Disconnect the C-103 joint connector.
(2) Disconnect ETACS-ECU connector C-315, and measure at 

the wiring harness side.

(3) Check the continuity (short to ground) between terminal No. 

4 and the ground.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 14.
NO :  Repair the wiring harness between C-315 

ETACS-ECU connector terminal No. 4 and C-103 
joint connector terminal No.18. Then, replace fuse 
No. 17 or fusible link No. 34.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-264

STEP 14. Wiring harness check between the C-103 joint 
connector and the C-46 AWC-ECU connector.
(1) Disconnect the C-46 AWC-ECU connector.
(2) Disconnect the C-103 joint connector, and measure at the 

wiring harness side.

(3) Check the continuity (short to ground) between terminal No. 

16 and the ground.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 15.
NO :  Repair the wiring harness between C-103 joint 

connector terminal No.16 and C-46 AWC-ECU 
connector terminal No.12. Then, replace fuse No. 17 
or fusible link No. 34.

STEP 15. Wiring harness check between the C-103 joint 
connector and the A-05 ASC-ECU connector.
(1) Disconnect ASC-ECU connector A-05.
(2) Disconnect the C-103 joint connector, and measure at the 

wiring harness side.

(3) Check the continuity (short to ground) between terminal 

No.17 and the ground.

OK: No continuity

Q: Is the check result normal?

YES : Replace the fuse No. 17 or the fusible link No. 34. 

Then, go to Step 20.

NO :  Repair the wiring harness between C-103 joint 

connector terminal No.17 and A-05 ASC-ECU 
connector terminal No.2. Then, replace fuse No. 17 or 
fusible link No. 34.