Wireless Control Module (WCM)
DTC U0141: ETACS-ECU CAN timeoutCAUTION:
- If DTC U0141 is set, be sure to diagnose the CAN bus line.
- When replacing the ECU, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
If the signal from ETACS-ECU cannot be received, the WCM sets DTC U0141.
TROUBLESHOOTING HINTS
- Malfunction of CAN bus line
- Malfunction of WCM
- Malfunction of ETACS-ECU
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 line.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan toolMB991958.
1. Connect scan tool MB991958. Refer to "How to connect the Scan Tool(M.U.T.-III)." Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES: Go to Step 2.
NO: Repair the CAN bus line (Refer to Controller Area Network, Diagnosis).
STEP 2. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
Q: Is the DTC set?
YES: Diagnose the ETACS-ECU (Refer to Chassis Electrical - ETACS, Diagnose).
NO: Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
1. Erase the DTC.
2. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
3. Check if DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES: Replace WCM and register the ID codes (Refer to ID Codes Registration Judgment Table).
NO: The trouble can be an intermittent malfunction (Refer to General (Body and Chassis) - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).