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Home >> Mazda >> 2001 >> 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, Performance Problem >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
  2. Turn ignition off. Disconnect IAT sensor connector. Check connector for loose or damaged terminals, poor contact or corrosion. If no problem is found, go to next step. If problem is found, repair as necessary and 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 and go to step  5.
  4. Disconnect appropriate PCM connectors. Check connector for loose or damaged terminals, poor contact or corrosion. If problem is present, repair as necessary and go to next step. If connector is okay, go to next step.
  5. Reconnect all connectors. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Operate vehicle under same conditions that set DTC P0111 originally. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0111 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0111 is not present, go to next step.
  6. Cycle ignition from off to on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.
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