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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 ASTC system diagnosis codes are set or not.
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Q.
Is the diagnosis code set?
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YES : Diagnose the ASTC system (Refer to GROUP 35C - Troubleshooting, Inspection Chart For Diagnosis Codes ).
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Reconfirm whether the diagnosis codes are set from A/T-ECU <4M4> or engine-A/T-ECU <6G7>.
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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 ASTC-ECU and A/T-ECU <4M4> or engine-A/T-ECU <6G7> (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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After replacing the ASTC-ECU, re-check the A/T diagnosis code output.
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Q.
Is the diagnosis code set?
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Replace the A/T-ECU <4M4> or engine-A/T-ECU <6G7>.
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