On-Board Diagnostic [Automatic Transmission]: Foreword

When the customer reports a vehicle malfunction, check the malfunction indicator lamp (MIL) indication, O/D OFF indicator light flashing, 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 .
- If no DTC exists, MIL does not illuminate, and O/D OFF indicator light flashes, diagnose the applicable symptom troubleshooting. See SYMPTOM TROUBLESHOOTING .
Fig 1: Malfunction Indicator Lamp Troubleshooting Flowchart
Courtesy of MAZDA MOTORS CORP.