Mitsubishi Lancer Evolution X. Manual - part 186

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-209

STEP 3. Check whether the DTC is reset.
Q: Is DTC U0001 set?

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

DTC U0100: Engine time-out error 

DTC U0101: TC-SST time-out error 

DTC U0126: Steering wheel sensor time-out error 

DTC U0141: ETACS time-out error 

DTC U0136: AWC time-out error

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.

• If diagnostic trouble codes U0100, U0101, U0126, 

U0141, and U0136 are set in ASC-ECU, always diagnose 
CAN bus lines. If there is any fault in the CAN bus lines, 
an incorrect DTC may be set.

• Whenever the ECU is replaced, ensure that the CAN 

bus lines are normal.

• When the steering wheel sensor is replaced, always 

perform calibration to make ASC-ECU learn the neutral 
point. (Refer to 

P.35C-289

.)

• When the hydraulic unit (integrated with ASC-ECU) is 

replaced, after turning the ignition switch ON and OFF 
(vehicle information from ETACS-ECU is registered), 
always perform the calibration of steering wheel sen-
sor, G and yaw rate sensor, brake fluid pressure sen-
sor, cut valve, and inlet valve.(Refer to 

P.35C-287

, 

P.35C-289

, 

P.35C-294

, and 

P.35C-295

.)

.

CIRCUIT OPERATION

ASC-ECU communicates with the engine control module, 
TC-SST-ECU, steering wheel sensor, ETACS-ECU, and 
AWC-ECU via the CAN bus lines.

.

DTC SET CONDITIONS

The diagnostic trouble code is stored if ASC-ECU cannot 
receive the signal sent from other ECU for a specified period.

.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-210

PROBABLE CAUSES

DTC U0100

• Wiring harness or connector failure of CAN bus line
• Engine ECU malfunction
• ASC-ECU malfunction

DTC U0101

• Wiring harness or connector failure of CAN bus line
• Malfunction of TC-SST-ECU
• ASC-ECU malfunction
• Interchanging of ETACS-ECU

DTC U0126

• Damaged wiring harness or connector in CAN bus line
• Malfunction of steering wheel sensor
• Malfunction of ASC-ECU

DTC U0141

• Wiring harness or connector failure of CAN bus line
• Malfunction of ETACS-ECU
• ASC-ECU malfunction

DTC U0136

• Wiring harness or connector failure of CAN bus line
• AWC-ECU malfunction
• ASC-ECU 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

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 2.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C − 

Troubleshooting 

P.54C-15

.) After repairing the CAN 

bus line, go to Step 5.

STEP 2. Scan tool diagnostic trouble code for other 
systems
Using scan tool MB991958, check if any other diagnostic trou-
ble code is set in the ECU corresponding to the relevant diag-
nosis.
Q: Is other DTC set?

YES : Perform troubleshooting for the diagnostic trouble 

code that is set.

NO :  Go to Step 3.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-211

STEP 3. Using scan tool MB991958, check read the DTC 
other system. 
Use scan tool to check if the same DTC (time-out) is set in the 
other ECU (CAN-C).
Q: Is any DTC set?

YES (DTC U0100 is set) : Replace the engine control 

module (ECM), and then go to Step 4.

YES (DTC U0101 is set) : Replace the TC-SST-ECU, and 

then go to Step 4.

YES (DTC U0126 is set) : Replace steering wheel sensor, 

and then go to Step 4.

YES (DTC U0141 is set) : Replace the ETACS-ECU, and 

then go to Step 4.

YES (DTC U0136 is set) : Replace the AWC-ECU, and 

then go to Step 4.

NO (No DTC is set.) : The procedure is complete.

STEP 4. Check whether the DTC is reset.
Q: Is DTC U0100, U0101, U0126, U0141 or U0136 set?

YES : Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-298

.) Then go to Step 5.

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

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 5. Check whether the DTC is reset.
Q: Is DTC U0100, U0101, U0126, U0141 or U0136 set?

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

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-212

DTC U0125: G and yaw rate sensor message time-out error/message error

G AND YAW 
RATE SENSOR

JOINT 
CONNECTOR (7)

AWC-ECU

ASC-ECU

G and Yaw Rate Sensor Circuit

AC708948

Connector: A-05

A-05 (B)

AB

AC708951AG

C-38 (B)

Connector: C-38