Mitsubishi Lancer Evolution X. Manual - part 201

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-269

STEP 5. Check of wheel speed sensor
Check for the presence of non-genuine electronic components 
and wiring harness of non-genuine electronic components to 
near the wheel speed sensor (wheel speed detecting section 
and wiring harness section). (Refer to 

P.35C-300

.)

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Remove the non-genuine electronic components and 

wiring harness of non-genuine electronic 
components. Then go to Step 9.

STEP 6. Scan tool service data
Check the following service data. (Refer to 

P.35C-276

.)

• Item 01: FL wheel speed sensor
• Item 02: FR wheel speed sensor
• Item 03: RL wheel speed sensor
• Item 04: RR wheel speed sensor
• Item 08: Lateral G sensor
• Item 10: Master cylinder pressure
• Item 11: Steering angle
• Item 12: Yaw rate sensor
• Item 129: FL wheel cylinder pressure
• Item 130: FR wheel cylinder pressure
• Item 131: RL wheel cylinder pressure
• Item 132: RR wheel cylinder pressure

Q: Is the check result normal?

YES : Go to Step 7.
NO (Abnormality of items 01 to 04) : Check the 

installation status of corresponding wheel speed 
sensor. (Refer to 

P.35C-300

.)

NO (Abnormality of items 08, 12) : Check the installation 

status of G and yaw rate sensor. (Refer to 

P.35C-304

.)

NO (Abnormality of item 11) : Check the installation status 

of steering wheel sensor. (Refer to 

P.35C-305

.)

NO (Abnormality of items 10, 129 to 132) : Replace the 

hydraulic unit (incorporates in ASC-ECU).(Refer to 

P.35C-298

.)

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-270

STEP 7. Hydraulic unit check
Perform the following actuator tests, and check that the opera-
tion is normal. (Refer to 

P.35C-276

.)

• Item 01: FL wheel ABS drive
• Item 02: FR wheel ABS drive
• Item 03: RL wheel ABS drive
• Item 04: RR wheel ABS drive
• Item 05: FL wheel TCL drive
• Item 06: FR wheel TCL drive
• Item 07: RL wheel TCL drive
• Item 08: RR wheel TCL drive

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-298

.) Then go to Step 9.

STEP 8. Operation check of ABS/skid control/TCL
Q: Is the check result normal?

YES : Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

NO :  Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-298

.) Then go to Step 9.

STEP 9. Operation check of ABS/skid control/TCL
Q: Is the check result normal?

YES : The procedure is complete.
NO :  Return to Step 1.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-271

Inspection Procedure 13: Steering wheel sensor power supply circuit system

Steering Wheel Sensor Power Supply Circuit

STEERING WHEEL SENSOR

IG1 
RELAY

FUSIBLE 
LINK

34

ETACS-
ECU

AC902052

AC708953AH

Connector: C-209

AC708972BI

Connectors: C-309, C-317

C-309 (B)

C-317

ETACS-ECU

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-272

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 (Refer to 
GROUP 54C, Trouble code diagnosis 

P.54C-15

).

• Whenever ECU is replaced, ensure that the CAN bus 

lines are normal.

• When the steering wheel sensor is replaced, always 

carry out calibration to make ASC-ECU learn the neu-
tral point (Refer to 

P.35C-289

).

.

OPERATION

• Steering wheel sensor contains the power supply circuit 

(terminal No.2) for Steering wheel sensor. The power is 
supplied from the ETACS-ECU (terminal No.5). The power 
is supplied from the fusible link No.33 through the multi-pur-
pose fuse No.12.

• When malfunction occurs in Steering wheel sensor power 

supply, the communication with scan tool becomes unavail-
able.

.

PROBABLE CAUSES

• Damaged wiring harness and connectors
• Fuse and fusible link malfunction
• Improper tightening of battery terminal
• Battery failure
• Charging system failed
• Steering wheel sensor 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

• MB991997: ASC check harness

STEP 1. Connector check: C-209 steering wheel sensor 
connector
Q: Is the check result normal?

YES : Go to Step 2.
NO  :  Repair the damaged connector.