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Home >> Mazda >> 2000 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0111: Intake Air Temperature (IAT) Sensor Circuit Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Go to next step.
  2. Turn ignition off. Disconnect IAT sensor. Check connector terminals. If no problem is found, go to next step. If problem is found, repair as necessary. Go to step  5.
  3. Check resistance between IAT sensor terminals. If resistance is more than 76 ohms, go to next step. If resistance is 76 ohms or less, replace IAT sensor. Go to step  5.
  4. Disconnect PCM connectors. Check connector terminals. If no problem is found, go to next step. If problem is found, repair as necessary. Go to next step.
  5. Connect all connectors. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Start engine. Using scan tool, check freeze frame data. If same DTC is pending, replace PCM. If DTC is not present, go to next step.
  6. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. If any other DTCs are present, diagnose and repair as necessary. If no DTCs are present, testing is complete.
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