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Home › Mazda › 2002 › 626 ES, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - System & Component Testing › Idle Control System › System Check (Except 626)

System Check (Except 626)

  1. Ensure engine is at ambient temperature. Connect NGS scan tool. Using PID/DATA monitor and record function, select ECT and RPM PIDs. Start engine.
  2. Engine speed should decrease as engine reaches operating temperature. If engine speed does not decrease or decreases slowly, check ECT sensor, IAC valve and related wiring.
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