Code No.U0001 Bus error (CAN-C)
Code No.U0019 Bus off (CAN-B)
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- If the diagnosis code No. U0001 or U0019 is set to the ETACS-ECU, always diagnose the CAN bus line.
- Before replacing the ECU, ensure that the communication circuit is normal.
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TROUBLE JUDGMENT
When the ETACS-ECU is returned from the bus off state, or when the bus off error is indicated to the ETACS-ECU state, the diagnosis code No. U0001 (CAN-C) or U0019 (CAN-B) is stored.
COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU may have a malfunction, or the ETACS-ECU power supply or earth circuit may have a problem.
PROBABLE CAUSES
- Malfunction of the ETACS-ECU
- Malfunction of wiring harness or connector
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting 
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STEP 2. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the ETACS-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the ETACS-ECU.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).