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DTC P0112 - INTAKE AIR TEMPERATURE (IAT) SENSOR LOW VOLTAGE INPUT Isuzu Oasis I

Testing & Diagnostics ~217 words
  1. Turn ignition on. Check IAT sensor using OBD-II scan tool. If 302°F (150°C) or more, or zero volts is indicated, go to next step. If 302°F (150°C) or more, or zero volts is not indicated, check if ambient air temperature is indicated. If engine is warm, indicated temperature will be higher than ambient air temperature. If correct ambient air temperature is not indicated, replace IAT sensor. If correct ambient air temperature is indicated, failure is intermittent. System is okay at this time. Check for poor connections or loose wires at IAT sensor connector and PCM connector. See WIRING DIAGRAMS article.
  2. Disconnect IAT sensor 2-pin connector. Check IAT sensor using OBD-II scan tool. If 302°F (150°C) or more, or zero volts is indicated, go to next step. If 302°F (150°C) or more, or zero volts is not indicated, replace IAT sensor.
  3. Turn ignition off. Disconnect PCM 31-pin connector "C". Check for continuity between ground and IAT sensor connector terminal No. 2 (Red/Yellow wire). If continuity exists, repair short in Red/Yellow wire between IAT sensor and PCM 31-pin connector "C" terminal C25 (Red/Yellow wire). See WIRING DIAGRAMS article. If continuity does not exist, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.

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