Section 19 (On-Board Diagnostic [Engine Controls MZI 3.7] (1 Of 5)): Foreword

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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 the DTC exists, diagnose the applicable DTC inspection. (See DTC TABLE .)
- If the DTC does not exist and the MIL does not illuminate, diagnose the applicable symptom troubleshooting.
  
  Fig 1: Malfunction Diagnosis Flow Chart
  Courtesy of MAZDA MOTORS CORP.