Code No. U0141: ETACS-ECU Time-out



caution If diagnosis code U0141 is stored in the engine-ECU, surely perform CAN bus line diagnosis.
caution Replace ECU after certainly confirming that the communication circuits are normal.

TROUBLE JUDGEMENT


Check Conditions
Judgement Criterion

COMMENTS ON TROUBLE SYMPTOM


Current malfunction
Past malfunction

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnosis



  • Use M.U.T.-III to perform CAN bus line diagnosis.

Q. Is the check result normal?

Go to Step 2.
Repair CAN bus line (Refer to GROUP 54C <PHEV> - Troubleshooting - CAN Bus Diagnostics Table ). After repairing CAN bus line, go to Step 6.

STEP 2. M.U.T.-III diagnosis code



  • Confirm whether the diagnosis code is stored in the ETACS-ECU.

Q. Is diagnosis code stored?

Perform troubleshooting of ETACS (Refer to GROUP 54A <PHEV> - ETACS - Diagnosis Code Chart ).
Go to Step 3.

STEP 3. M.U.T.-III diagnosis code


Check that the other ECU performing CAN communication with ETACS-ECU stores diagnosis code No. U0141 [Refer to GROUP 54C <PHEV> - CAN-related Diagnosis Code Table ].

Q. Is diagnosis code stored?

Go to Step 4.
Go to Step 5.

STEP 4. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.
Confirm again whether the diagnosis code is stored in the engine-ECU.

  1. Erase the stored diagnosis code.
  2. Power supply mode of electric motor switch: OFF → ACC
  3. Confirm whether the diagnosis code is stored.

Q. Is diagnosis code stored?

After replacing the ETACS-ECU, go to Step 6.
Intermittent malfunction in CAN bus line between engine-ECU and ETACS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 5. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.
Confirm again whether the diagnosis code is stored in the engine-ECU.

  1. Erase the stored diagnosis code.
  2. Power supply mode of electric motor switch: OFF → ACC
  3. Confirm whether the diagnosis code is stored.

Q. Is diagnosis code stored?

After replacing the engine-ECU, go to Step 6.
Intermittent malfunction in CAN bus line between engine-ECU and ETACS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 6. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.
Confirm again whether the diagnosis code is stored in the engine-ECU.

  1. Erase the stored diagnosis code.
  2. Power supply mode of electric motor switch: OFF → ACC
  3. Confirm whether the diagnosis code is stored.

Q. Is diagnosis code stored?

Go to Step 1.
Check end.