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Home >> Mazda >> 2001 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0112: Intake Air Temperature (IAT) Sensor Circuit, Low Input >> 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 on. Using scan tool, access IAT PID data. If IAT PID is less than .2 volt, go to next step. If IAT PID is .2 volt or more, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
  3. Turn ignition off. Disconnect IAT sensor connector. Check connector for loose or damaged terminals, poor contact or corrosion. If problem is found, repair as necessary and go to step  7. If no problem is found, go to next step.
  4. Turn ignition on. Using scan tool, access IAT PID data. If IAT PID is less than .2 volt, go to next step. If IAT PID is .2 volt or more, replace IAT sensor and go to step  7.
  5. Turn ignition off. Disconnect appropriate PCM connectors. Check for continuity between ground and IAT sensor harness connector terminal "B". If continuity is not present, go to next step. If continuity is present, repair short to ground in Pink/Blue wire between IAT sensor and PCM connector terminal No. 4N. See WIRING DIAGRAMS article. Go to step  7.
  6. Check for continuity between IAT sensor harness connector terminals "A" and "B". If continuity is not present, go to next step. If continuity is present, repair short between circuits and go to next step.
  7. Reconnect all connectors. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0112 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 P0112 is not present, go to next step.
  8. 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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