Code No. B1731: ENG ECU authentification timeout
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caution |
- If diagnosis code No. B1731 is set in the ETACS-ECU, diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
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If the ETACS-ECU cannot receive any signals from the engine-ECU, diagnosis code B1731 will be set.
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COMMENT ON TROUBLE SYMPTOM
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Connector(s) or wiring harness in the CAN bus lines between the ETACS-ECU and the engine-ECU, the power supply system to the engine-ECU, the engine-ECU itself, or the ETACS-ECU itself may be defective.
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note |
Diagnosis code No.B1731 is always set along with MPI system diagnosis code No.U0167.
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- Malfunction of engine-ECU
- Malfunction of ETACS-ECU
- Damaged harness wires and connectors
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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 line (Refer to GROUP 54C - Troubleshooting). Repair the CAN bus line and go to Step 3.
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STEP 2. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Turn the ignition switch to the "LOCK" (OFF) position once, and then turn it to the ON position again.
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(2)Check that diagnosis code No.B1731 is not set as a current trouble.
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Q.
Is diagnosis code No.B1731 set?
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Replace the ETACS-ECU (Refer to ). After registering the ID codes, go to Step 3.
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The diagnosis is complete. If another diagnosis code is set, refer to Diagnosis Code Chart .
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STEP 3. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set.
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(1)Turn the ignition switch to the "LOCK" (OFF) position once, and then turn it to the ON position again.
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(2)Check that diagnosis code No.B1731 is not set as a current trouble.
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Q.
Is diagnosis code No.B1731 set?
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Replace the engine-ECU and resister the ID code (Refer to ).
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The diagnosis is complete. If another diagnosis code is set, refer to Diagnosis Code Chart .
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