On-Board Diagnostic [Engine Control System MZR 1.5]: 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 the following flowchart.
  • If a DTC exists, diagnose the applicable DTC inspection. (See DTC TABLE )
  • If a DTC does not exist and the MIL does not illuminate or flash, diagnose the applicable symptom troubleshooting. (See QUICK DIAGNOSTIC CHART .)

Fig 1: Identifying Diagnostic Procedure Chart

Courtesy of MAZDA MOTORS CORP.