Code No. U0155: Meter CAN time-out
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- If diagnosis code No.U0155 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.
- If the ignition switch is turned to the ON position without starting the engine, diagnosis code U0155 (past trouble) may be set in the heater controller assembly (A/C-ECU) after three minutes.
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The heater controller assembly (A/C-ECU) receives air conditioner control-related signals from the combination meter via the CAN bus lines. If the ECU cannot receive any of the air conditioner control-related signals from the combination meter, diagnosis code U0155 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 combination meter and the heater controller assembly (A/C-ECU), the power supply system to the combination meter, the combination meter 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 heater controller assembly (A/C-ECU) and the combination meter, and the power supply system to the combination meter. 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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- Damaged wiring harness or connectors
- Malfunction of the combination meter
- 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 combination meter.
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Q.
Is the diagnosis code set?
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Diagnose the combination meter (Refer to GROUP 54A - Combination Meter ).
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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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- ETACS-ECU
U0155: Combination meter 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 combination meter (Refer to GROUP 54A - Combination Meter ), 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 combination meter 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 combination meter 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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