CAN

DTC U0114: AWD-ECU Time-Out [AWD]

CAUTION:
- If the ECM output the DTC U0114, make sure to diagnose the CAN bus line.
- Before replacing the ECU, make sure that the communication circuit is operating normally.

DTC SET CONDITIONS

Check Conditions
- After 2 seconds have passed since the ignition switch was turned to "ON" position.
- Battery positive voltage is 10 volts or higher.

Judgement Criterion
- Unable to receive AWD-ECU signals through the CAN bus line for 4 seconds.

COMMENT

Current Trouble
- Some of the possible causes are a harness or connector damage between the ECM and the AWD-ECU on the CAN bus line, a failure in the AWD-ECU power supply system, a failure in the AWD-ECU, or a failure in the ECM.

Past Trouble
- Proceed to troubleshoot based on a harness or connector damage on the CAN bus line between the ECM and AWD-ECU, and a failure in the AWD-ECU power supply system. Refer to "How to cope with past trouble" (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points-How to Cope with Intermittent Malfunctions).






CAUTION: When the ignition key is maintained within the range "A" (i.e., the ignition switch IG2 is in OFF position but the cranking does not start) for more than 1 second, ECM stores DTC U0114 (the past trouble).

NOTE: If a malfunction occurred in the past, a failure cannot be discovered through the MB991958 CAN bus diagnosis even if there might be a problem with the CAN bus. In this case, refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points-How to Cope with Intermittent Malfunctions. Furthermore, it is possible to narrow down the areas of the possible failures from the DTCs that are output by the ECUs, which are communicating on the CAN bus (Refer to Controller Area Network (CAN), Explanation About The Scan Tool (M.U.T-III) Can Bus Diagnostics).

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- CAN line harness damage or connector damage.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A

STEP 1. Using scan tool MB991958, diagnose CAN bus line.






CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Diagnose CAN bus line.
4. Turn the ignition switch the "LOCK" (OFF) position.

Q: Is the CAN bus line normal?

YES : It can be assumed that this malfunction is intermittent. Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points-How to Cope with Intermittent Malfunctions. NO : Repair the CAN bus line. Refer to Controller Area Network (CAN), Diagnosis-Can Bus Diagnostics Table. Then go to Step 2.

STEP 2. Recheck for diagnostic trouble code.

Check again if the DTC is set.

1. Erase the DTC.
2. Turn the ignition switch to the "ON" position.
3. Check if DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC U0114set?

YES : Retry the troubleshooting.

NO : The inspection is complete.