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HOMESERVICE MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 62 (ENGINE CONTROLS [SYSTEM & COMPONENT TESTING])IDLE CONTROL SYSTEMIDLE AIR CONTROL VALVEPROTEGE & PROTEGE5
2010 Mazda 5 Sport, 2.3 L, Standard

Protege & Protege5

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Protege & Protege5
WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

  1. Resistance Inspection

    Disconnect Idle Air Control (IAC) valve 2-pin harness connector. See IAC VALVE LOCATION  table. Using an ohmmeter, measure resistance between IAC valve terminals. See IAC VALVE RESISTANCE SPECIFICATIONS  table. If IAC valve is okay, check for open or short circuit. Go to next step. If resistance reading is not within specification, replace IAC valve.

  2. Open Circuit Inspection

    Disconnect PCM 104-pin harness connector. Connect 104-Pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Check for continuity between following terminals:
    • Power circuit - IAC valve harness connector terminal "A" (Brown wire) and breakout box terminal No. 54.
    • GND circuit - IAC valve harness connector terminal "B" (Gray wire) and breakout box terminal No. 83.

    If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.

  3. Short Circuit Inspection

    • Power circuit - IAC valve harness connector terminal "A" and breakout box terminal No. 54 (Brown wire) to ground.
    • GND circuit - IAC valve harness connector terminal "B" and breakout box terminal No. 83 (Gray wire) to ground.

    If continuity is present, repair short circuit in suspect wire or replace wire harness.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.