Code No. U0230: Power Gate CAN time-out
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If diagnosis code No.U0230 stored in the heater controller assembly (A/C-ECU), diagnose the CAN main bus line.
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Whenever the ECU is replaced, ensure that the communication circuit is normal.
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The heater controller assembly (A/C-ECU) will store diagnosis code U0230 when it can receive no signals from the electric tailgate.
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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 electric tailgate and the heater controller assembly (A/C-ECU), the power supply system to the electric tailgate, the electric tailgate itself, or the heater controller assembly (A/C-ECU) may be defective.
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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 electric tailgate, and the power supply system to the electric tailgate. 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 cannot 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 stored 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 electric tailgate
- 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 whether the electric tailgate-related diagnosis code is stored.
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Q.
Is the diagnosis code stored?
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Diagnose the power gate. Refer to .
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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 stored.
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- ETACS-ECU
U0230: Power Gate CAN timeout
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Q.
Is the diagnosis code stored?
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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 stored again.
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Recheck if the diagnosis code is stored.
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(1)Erase the diagnosis code.
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(2)Turn the power supply mode of the electric motor switch to ON.
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(3)Check if the diagnosis code is stored.
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Q.
Is the diagnosis code stored?
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Replace the electric tailgate, 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 electric tailgate 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 stored again.
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Recheck if the diagnosis code is stored.
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(1)Erase the diagnosis code.
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(2)Turn the power supply mode of the electric motor switch to ON.
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(3)Check if the diagnosis code is stored.
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Q.
Is the diagnosis code stored?
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Replace the heater controller assembly (A/C-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 electric tailgate 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 stored again.
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Recheck if the diagnosis code is stored.
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(1)Erase the diagnosis code.
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(2)Turn the power supply mode of the electric motor switch to ON.
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(3)Check if the diagnosis code is stored.
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Q.
Is the diagnosis code stored?
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Return to Step 1.
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The procedure is complete.
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