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Using M.U.T.-III, perform CAN bus line diagnosis.
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Q.
Is the check result normal?
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Repair the CAN bus line (Refer to GROUP 54D - Troubleshooting ). and then go to Step 4.
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Check whether the fuel system diagnosis codes are set or not.
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Q.
Is the diagnosis code set?
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YES : Diagnose the fuel system (Refer to GROUP 13A - Troubleshooting <6G7>, or GROUP 13B - Troubleshooting <4M4>).
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Reconfirm whether the diagnosis codes are set from transfer-ECU.
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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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Q.
Is the diagnosis code set?
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Intermittent malfunction in CAN bus line between engine-ECU <4M4> or engine-A/T-ECU <6G7> and transfer-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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After replacing the engine-ECU <4M4> or engine-A/T-ECU <6G7>, re-check the transfer diagnosis code output.
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Q.
Is the diagnosis code set?
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Replace the transfer-ECU.
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