Code No. U0141: ETACS-ECU Time-out



caution If diagnosis code U0141 is outputted from engine-ECU, surely perform CAN busline diagnosis.
caution Replace ECU after certainly confirming that the communication circuits are normal.

TROUBLE JUDGMENT


Check Conditions
  • After 4 seconds have passed since the ignition switch was turned to "ON" position.
  • Battery positive voltage is 10 - 16.5 V.
Judgment Criterion
  • Unable to receive ETACS-ECU signals through the CAN busline for 4 seconds.

COMMENTS ON TROUBLE SYMPTOM


Current malfunction
  • The failure is possibly caused by malfunction of the harness and connector in CAN busline between engine-ECU and ETACS-ECU, by malfunction in the power supply system of ETACS-ECU, in ETACS-ECU itself, in engine-ECU.
Past malfunction
  • Proceed with troubleshooting focusing on malfunction of the harness and connector in CAN busline between engine-ECU and ETACS-ECU and malfunction in the power supply system of ETACS-ECU.For diagnosis procedure, refer to how to cope with past malfunctions. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Treat Past Trouble ).
    note In the case of past malfunctions, M.U.T.-III CAN busline diagnosis cannot detect a malfunction even if there is a malfunction in CAN bus. Therefore, check CAN busline as in the case of response to intermittent malfunctions (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ). It is possible to narrow down areas with a high possibility of malfunctions from diagnosis codes output to each ECU that performs CAN communication (Refer to GROUP 54C - Explanation about the M.U.T.-III CAN Bus Diagnostics ).

PROBABLE CAUSES



  • Failed harness and connector
  • Failed ETACS-ECU
  • Failed engine-ECU

DIAGNOSIS PROCEDURE


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



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

Q. Is the check result normal?

Go to Step 2 .
Repair CAN busline (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnosis Table ). After repairing CAN busline, go to Step 6 .

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



  • Confirm the diagnosis code is outputted from ETACS-ECU.

Q. Is diagnosis code set?

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

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


Diagnosis code No. U0141 from the following ECU that performs CAN communication with combination meter: Confirm ETACS-ECU Time-out is output.

  • A/T-ECU
  • 4WD-ECU
  • ABS-ECU <Vehicles with ABS> or ASC-ECU <Vehicles with ASC>
  • KOS-ECU <Vehicles with KOS> or WCM-ECU <Vehicles with WCM>
  • Combination meter
  • A/C-ECU

Q. Is diagnosis code set?

Go to Step 4 .
Go to Step 5 .

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



  • Reconfirmation of diagnosis code.
Confirm again the diagnosis code is outputted from the engine-ECU.

  1. Erase the output diagnosis code.
  2. Ignition switch: LOCK (OFF) → ON
  3. Confirm whether the diagnosis code is output.

Q. Is diagnosis code set?

After replacing the ETACS-ECU, go to Step 6 .
Intermittent malfunction in CAN busline 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 the diagnosis code is outputted from the engine-ECU.

  1. Erase the output diagnosis code.
  2. Ignition switch: LOCK (OFF) → ON
  3. Confirm whether the diagnosis code is output.

Q. Is diagnosis code set?

After replacing the engine-ECU, go to Step 6 .
Intermittent malfunction in CAN busline 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 the diagnosis code is outputted from the engine-ECU.

  1. Erase the output diagnosis code.
  2. Ignition switch: LOCK (OFF) → ON
  3. Confirm whether the diagnosis code is output.

Q. Is diagnosis code set?

Go to Step 1 .
Check end.