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Home >> Mazda >> 2003 >> Protege Mazdaspeed >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls [System & Component Testing] >> Idle Control System >> System Check
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System Check

  1. Ensure engine is at ambient temperature. Connect scan tool to DLC-2. 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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