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Home >> Mazda >> 2000 >> 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 PID data has been recorded. Check service bulletins. Go to next step.
  2. Turn ignition on. Using scan tool, access PID/DATA MONITOR. Record PID data for IAT V. If IAT PID is less than .2 volt, go to next step. If IAT PID is .2 volt or more, problem is intermittent (not current).
  3. Turn ignition off. Inspect all applicable harness connectors. If problem is found, repair as necessary and go to step  7. If no problem is found, go to next step.
  4. Disconnect IAT sensor harness connector. Turn ignition on. Using scan tool, check IAT PID. If IAT PID is less than .2 volt, go to next step. If IAT PID is .2 volt or more, replace IAT sensor. Go to step  7.
  5. Turn ignition off. Disconnect PCM connectors. Check continuity between IAT sensor harness connector terminal "B" and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground. Go to step  7.
  6. Check 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. Go to next step.
  7. 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.
  8. Clear DTC from memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Recheck for DTCs. If DTC is still present, replace PCM. If DTC is not present, testing is complete.
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