Mitsubishi Lancer Evolution X. Manual - part 146

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-49

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

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

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the wheel speed sensor 

circuit power supply terminal (signal terminal) No. 45 and 
the body ground as well as between the ground terminal 
No. 46 and the body ground.

OK: 1 volt or less

Q: Is the check result normal?

YES  : Go to Step 9.
NO (Not normal at the terminal No. 45 or 46) : Go to Step 

10.

STEP 9. Resistance measurement at A-05 ASC-ECU 
connector
(1) Disconnect the ASC-ECU connector, connect the special 

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

(2) Measure the resistance between the wheel speed sensor 

circuit power supply terminal (signal terminal) No. 45 and 
the body ground as well as between the ground terminal 
No. 46 and the body ground.

OK: No continuity

Q: Is the check result normal?

YES  : Go to Step 12.
NO (Not normal at the terminal No. 45 or 46) : Go to Step 

10.

AC400817CB

ASC-ECU

MB991997

Check harness

A-05 ASC-ECU
harness connector

AC400817CC

ASC-ECU

MB991997

Check harness

A-05 ASC-ECU
harness connector

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-50

STEP 10. Connector check: A-05 ASC-ECU connector, A-11 
wheel speed sensor <FL> connector
Q: Is the check result normal?

YES : Go to Step 11.
NO :  Repair the defective connector. Then go to Step 16.

STEP 11. Wiring harness check between A-05 ASC-ECU 
connector terminal No. 45 and A-11 wheel speed sensor 
<FL> connector terminal No. 1, and between A-05 
ASC-ECU connector terminal No. 46 and A-11 wheel speed 
sensor <FL> connector terminal No. 2

• Check for short circuit in wheel speed sensor <FL> circuit

Q: Is the check result normal?

YES : Replace the wheel speed sensor <FL>. (Refer to 

P.35C-300

.) Then, go to Step 16.

NO :  Repair the wiring harness. Then go to Step 16.

STEP 12. Voltage measurement at A-05 ASC-ECU 
connector
(1) Disconnect the ASC-ECU connector, connect the special 

tool ASC check harness (MB991997) to the ASC-ECU-side 
connector and the wiring harness-side connector, and then 
measure at the special tool connector side.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the wheel speed sensor 

circuit power supply terminal (signal terminal) No. 45 and 
the body ground.

OK: Battery positive voltage

Q: Is the check result normal?

YES : Go to Step 13.
NO :  Go to Step 15.

STEP 13. Connector check: A-05 ASC-ECU connector, A-11 
wheel speed sensor <FL> connector
Q: Is the check result normal?

YES : Go to Step 14.
NO :  Repair the defective connector. Then go to Step 16.

AC400817CD

ASC-ECU

MB991997

Check harness

A-05 ASC-ECU
harness connector

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-51

STEP 14. Wiring harness check between A-05 ASC-ECU 
connector terminal No. 45 and A-11 wheel speed sensor 
<FL> connector terminal No. 1, and between A-05 
ASC-ECU connector terminal No. 46 and A-11 wheel speed 
sensor <FL> connector terminal No. 2

• Open circuit check of wheel speed sensor <FL> circuit

Q: Is the check result normal?

YES : Go to Step 15.
NO :  Repair the wiring harness. Then go to Step 16.

STEP 15. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or more.

NOTE: The ABS warning light does not turn OFF in some 
cases unless the vehicle runs at 12mph (20 km/h) or higher.

Q: Is DTC C1011 set?

YES : Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-298

.) Then go to Step 16.

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 16. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or more.

NOTE: The ABS warning light does not turn OFF in some 
cases unless the vehicle runs at 12mph (20 km/h) or higher.

Q: Is DTC C1011 set?

YES : Return to Step 1.
NO :  This diagnosis is complete.

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-52

DTC C101C: Abnormality in FR wheel speed sensor signal

ASC-ECU

(LH)

(LH)

(RH)

(RH)

FRONT WHEEL SPEED SENSOR

REAR WHEEL SPEED SENSOR

Wheel Speed Sensor Circuit

AC804587

AC708948

A-05 (B)

AC

Connectors: A-03, A-05

A-03 (B)