• When the customer reports a vehicle malfunction, check the malfunction indicator lamp (MIL), AT warning light illuminating, and TCM memory for diagnostic trouble code (DTC), then diagnose the malfunction according to the following flowchart.

– If a DTC exists, diagnose the applicable DTC. (See DTC TABLE [RC4A-EL].)
– If no DTC exists, the MIL and AT warning lights do not illuminate. Diagnose the applicable symptom troubleshooting. (See SYMPTOM TROUBLESHOOTING ITEM TABLE.)

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Malfunction Indicator Lamp (MIL), AT warning light