Code No. U0141: ETACS-ECU CAN time-out
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caution |
- If diagnosis code No.U0141 is set in the heater controller assembly (A/C-ECU), diagnose the CAN main bus line.
- Whenever the ECU is replaced, ensure that the communication circuit is normal.
- When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID
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The heater controller assembly (A/C-ECU) receives air conditioner operation-related signal from the ETACS-ECU via the CAN bus lines. If the heater controller assembly (A/C-ECU) can not receive the air conditioner operation-related signal at all on the ETACS-ECU, diagnosis code No.U0141 will be set.
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COMMENTS ON TROUBLE SYMPTOM
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Current trouble
- Connector(s) or wiring harness in the CAN bus lines between the ETACS-ECU and the heater controller assembly (A/C-ECU), the power supply system to the ETACS-ECU, the ETACS-ECU itself, or the heater controller assembly (A/C-ECU) may be faulty.
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Past trouble
- Carry out diagnosis with particular emphasis on connector(s) or wiring harness in the CAN bus lines between the ETACS-ECU and the heater controller assembly (A/C-ECU), and the power supply system to the ETACS-ECU. For diagnosis procedures, refer to "How to treat past trouble" (Refer to GROUP 00 - How to Treat Past Trouble
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For a past trouble, you can not find it by the M.U.T.-III CAN bus diagnostics even if there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Cope with Intermittent Malfunction and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the diagnosis code, which is set regarding the CAN communication-linked ECUs (Refer to GROUP 54C - CAN Bus Line Diagnostic Flow ).
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If the ignition switch is turned on without starting the engine and then three minutes pass, the heater controller assembly (A/C-ECU) may set U0141 as past trouble.
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- Damaged wiring harness or connectors
- Malfunction of the ETACS-ECU
- Malfunction of the heater controller assembly (A/C-ECU)
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 2.
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Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 6.
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STEP 2. M.U.T.-III other system diagnosis code
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Check if diagnosis code is set in the ETACS-ECU.
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Q.
Is the diagnosis code set?
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Diagnose the ETACS-ECU (Refer to GROUP 54A - ETACS ).
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Go to Step 3.
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STEP 3. M.U.T.-III other system diagnosis code
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Check if a diagnosis code, which relates to CAN communication-linked systems below, is set.
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- Combination meter
U0141: ETACS-ECU timeout
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Q.
Is the diagnosis code set?
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Go to Step 4.
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Go to Step 5.
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STEP 4. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: LOCK (OFF) to ON
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ), and then go to Step 6.
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A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the ETACS-ECU and the heater controller assembly (A/C-ECU) (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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STEP 5. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: LOCK (OFF) to ON
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the heater controller assembly (A/C-ECU) (Refer to ), and then go to Step 6.
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A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the ETACS-ECU and the heater controller assembly (A/C-ECU) (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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STEP 6. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: LOCK (OFF) to ON
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Return to Step 1.
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The procedure is complete.
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