Section 421 (Symptom Troubleshooting (Engine Control System) AJ): Foreword

WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

When the customer reports a vehicle malfunction, check the malfunction indicator lamp (MIL) indication and diagnostic trouble code (DTC), then diagnose the malfunction according to following flowchart.
- If a DTC exists, diagnose the applicable DTC inspection. (See 01-02A-21 DTC TABLE.)
- If no DTC exists and the MIL does not illuminate or flash, diagnose the applicable symptom troubleshooting. (See SYMPTOM DIAGNOSTIC INDEX .)
Fig 1: Symptom Diagnostic Flow Chart
Courtesy of MAZDA MOTORS CORP.