Active Stability Control System (ASC)
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 incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines Initial Inspection and Diagnostic Overview ).
- 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 Testing and Inspection ).
- 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 sensor, G and yaw rate sensor, brake fluid pressure sensor, cut valve, and inlet valve (Refer to G and Yaw Rate Sensor Calibration , Testing and Inspection , Master Cylinder Brake Fluid Pressure Sensor Calibration , and Testing and Inspection ).
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.
PROBABLE CAUSES
DTC U0100
- Wiring harness or connector failure of CAN bus line
- Engine ECU malfunction
- ASC-ECU malfunction
- Connector disconnected or improperly connected
- Stretched or broken wires
DTC U0101
- Wiring harness or connector failure of CAN bus line
- Malfunction of TC-SST-ECU
- ASC-ECU malfunction
- Interchanging of ETACS-ECU
- Connector disconnected or improperly connected
- Stretched or broken wires
DTC U0126
- Damaged wiring harness or connector in CAN bus line
- Malfunction of steering wheel sensor
- Malfunction of ASC-ECU
- Connector disconnected or improperly connected
- Stretched or broken wires
DTC U0141
- Wiring harness or connector failure of CAN bus line
- Malfunction of ETACS-ECU
- ASC-ECU malfunction
- Connector disconnected or improperly connected
- Stretched or broken wires
DTC U0136
- Wiring harness or connector failure of CAN bus line
- AWC-ECU malfunction
- ASC-ECU malfunction
- Connector disconnected or improperly connected
- Stretched or broken wires
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 CAN Bus Diagnostics Chart).
After repairing the CAN bus line, go to Step 3.
STEP 2. Scan tool diagnostic trouble code for other systems
Using scan tool MB991958, check if any other diagnostic trouble code is set in the ECU corresponding to the relevant diagnosis.
Q. Is other DTC set?
YES Perform troubleshooting for the diagnostic trouble code that is set.
NO Go to Step 3.
STEP 3. Connector check: ASC-ECU connector
Q. Is the check result normal?
YES Go to Step 4.
NO Repair the defective connector. Then go to Step 4.
STEP 4. ETACS-ECU coding data check
Check the following coding data stored in ETACS-ECU Programming and Relearning).
Vehicle line
OK: LANCER EVO
Transaxle
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 5.
NO Replace the ETACS-ECU Electronic Time and Alarm Control System (ETACS). Then go to Step 6.
STEP 5. Check whether the DTC is reset.
Erase the DTCs.
Q. Is DTC U0100, U0101, U0126, U0141 or U0136 set?
YES Replace the hydraulic unit (integrated with ASC-ECU) (Refer to Service and Repair).
Then go to Step 6.
NO Intermittent malfunction How to Cope With Intermittent Malfunctions).
STEP 6. Check whether the DTC is reset.
Erase the DTCs.
Q. Is DTC U0100, U0101, U0126, U0141 or U0136 set?
YES Return to Step 1.
NO The procedure is complete.