Code No.U1073: Bus off
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- If diagnosis code U1073 is set in the A/T-ECU <4M4> or engine-A/T-ECU <6G7>, always diagnose the CAN main busline.
- Whenever the ECU is replaced, ensure that the communication circuit is normal.
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DIAGNOSIS CODE SET CONDITIONS
The failure is possibly caused by malfunction of the harness and connector in CAN busline or by malfunction in A/T-ECU <4M4> or engine-A/T-ECU <6G7>.
PROBABLE CAUSES
- Damaged wiring harness or connector
- Malfunction of the A/T-ECU <4M4>
- Malfunction of the engine-A/T-ECU <6G7>
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STEP 1. M.U.T.-III CAN bus diagnostics
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Using M.U.T.-III, perform CAN busline diagnosis.
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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 busline (Refer to GROUP 54D - Troubleshooting  ). Then go to Step 3.
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STEP 2. M.U.T.-III diagnosis code
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Check if the diagnosis code is set.
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Replace the A/T-ECU <4M4> or engine-A/T-ECU <6G7>. Then go to Step 3.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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STEP 3. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Check if the diagnosis code is set.
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Go to Step 1.
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The procedure is complete.
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