Symptom Troubleshooting [Engine Control System AJ): Foreword

• 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 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: Diagnostic Flow Chart

Courtesy of MAZDA MOTORS CORP.