Mitsubishi Lancer Evolution X. Manual - part 143

 

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Mitsubishi Lancer Evolution X. Manual - part 143

 

 

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-37

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 − 

CAN Bus Diagnostics table 

P.54C-9

). On completion, 

go to Step 2.

STEP 2. DTC recheck after repairing the CAN bus line
Q: Is DTC C1020 set?

YES : Go to Step 3.
NO :  This diagnosis is complete.

STEP 3. Scan tool service data
Check the following service data. (Refer to 

P.35C-276

.)

• Item No.03: RL wheel speed sensor

Q: Is the check result normal?

YES : Go to Step 10.
NO :  Go to Step 4.

STEP 4. Connector check: Connector check: A-05 
ASC-ECU connector, C-45 intermediate connector, D-18 
wheel speed sensor <RL> connector
Q: Is the check result normal?

YES : Go to Step 5.
NO :  Repair the defective connector. Then go to Step 11.

STEP 5. 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 

power supply terminal (signal terminal) No. 36 and the body 
ground as well as between the ground terminal No. 37 and 
the body ground.

OK: 1 volt or less

Q: Is the check result normal?

YES  : Go to Step 6.
NO (Not normal at the terminal No. 34 or 33) : Go to Step 

8.

AC400817CH

ASC-ECU

MB991997

Check harness

A-05 ASC-ECU
harness connector

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-38

STEP 6. 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. 36 and 
the body ground as well as between the ground terminal 
No. 37 and the body ground.

OK: No continuity

Q: Is the check result normal?

YES  : Go to Step 7.
NO (Not normal at the terminal No. 36 or 37) : Go to Step 

8.

STEP 7. Voltage measurement at A-05 ASC-ECU connector
(1) Disconnect the ASC-ECU connector, connect 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. 36 and 
the body ground and between the wheel speed sensor 
circuit ground terminal No. 37 and the body ground.

OK:

Terminal No.36 and the body ground: Battery 

positive voltage

Terminal No.37 and the body ground: 1 V or less

Q: Is the check result normal?

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

AC400817CI

ASC-ECU

MB991997

Check harness

A-05 ASC-ECU
harness connector

AC400817CJ

ASC-ECU

MB991997

Check harness

A-05 ASC-ECU
harness connector

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-39

STEP 8. Check of wheel speed sensor as a single unit
Refer to 

P.35C-303

.

Q: Is the check result normal?

YES : Go to Step 9.
NO :  Replace the wheel speed sensor <RL>. (Refer to 

P.35C-300

.) Then go to Step 11.

STEP 9. Wiring harness check between A-05 ASC-ECU 
connector terminal No. 36 and D-18 wheel speed sensor 
<RL> connector terminal No. 1, and between A-05 
ASC-ECU connector terminal No. 37 and D-18 wheel speed 
sensor <RL> connector terminal No. 2

• Check for short or open circuit in wheel speed sensor <RL> 

circuit

Q: Is the check result normal?

YES : Go to Step 10.
NO :  Repair the wiring harness. Then go to Step 11.

STEP 10. 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 C1020 set?

YES : Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-298

.) Then go to Step 11.

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

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 11. 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 C1020 set?

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

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-40

DTC C102B: Abnormality in RR wheel speed sensor circuit

ASC-ECU

(LH)

(LH)

(RH)

(RH)

FRONT WHEEL SPEED SENSOR

REAR WHEEL SPEED SENSOR

Wheel Speed Sensor Circuit

AC804587

AC708948

Connector: A-05

A-05 (B)

AB

AC708950

Connector: C-47

AE

AC708955

Connector: D-09

D-09 (B)

AH

 

 

 

 

 

 

 

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