Mitsubishi Evolution X. Manual — part 798

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-199

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-267

.)

• 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-266

,

P.35C-267

,

P.35C-268

, and

P.35C-269

.)

.

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

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-200

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-14

.) 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

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-201

STEP 3. ETACS-ECU coding data check
Check the following coding data stored in ETACS-ECU. (Refer
to GROUP 00

− Coding Table

P.00-39

.)

Vehicle line

OK: LANCER EVO

Transmission

OK (Vehicles without TC-SST): 5MT
OK (Vehicles with TC-SST): TC-SST

Engine type

OK: D4 V.V.T. 2.0L TC

Engine power

OK: Normal

Chassis Type for A.S.C.

OK: Type 1

Final drive

OK: AWD FF Base

Transfer

OK: ACD

SAS

OK: Present

AWD

OK: Not present

TCM

OK (Vehicles without TC-SST): Not present
OK (Vehicles with TC-SST): Present

ACDAYC

OK: Present

Q: Is the check result normal?

YES : Go to Step 4.
NO : Replace the ETACS-ECU. (Refer to GROUP 54A

−

ETACS-ECU

P.54A-676

.) Then go to Step 5.

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-272

.) 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 SKID CONTROL SYSTEM (ASC)

35C-202

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

• Whenever the ECU is replaced, ensure that the CAN

bus lines are normal.

• Do not drop the G and yaw rate sensor or subject it to a

shock.

• When the G and yaw rate sensor is replaced, always

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

P.35C-266

.)

• 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-266

,

P.35C-267

,

P.35C-268

, and

P.35C-269

.)

.

CIRCUIT OPERATION

The G and yaw rate sensor outputs the signal to ASC-ECU and
S-AWC-ECU via the special CAN bus lines (Local CAN).

.

DTC SET CONDITIONS

This diagnostic trouble code is set if ASC-ECU cannot receive
the signal sent from the G and yaw rate sensor even when the
voltage supplied to ASC-ECU is normal.

AC708948

Connector: A-05

A-05 (B)

AB

AC708951AG

C-38 (B)

Connector: C-38

AC708950AN

C-46

C-50 (B)

Connectors: C-46, C-47, C-50

C-47