DTC P0112 - Intake Air Temperature (IAT) Sensor
- Turn ignition on. Check IAT sensor using scan tool. If 302°F (150°C) or more is displayed, go to next step. If 302°F (150°C) or more is not displayed, check if correct ambient temperature is displayed. If correct ambient temperature is not displayed, replace IAT sensor. If engine is warm, displayed temperature will be higher than ambient temperature. If correct ambient temperature is displayed, failure is intermittent. Check for poor connections or loose wires at IAT sensor connector and PCM connector. See WIRING DIAGRAMS section.
- Disconnect IAT sensor. Check IAT sensor using scan tool. If 302°F (150°C) or more is not displayed, replace IAT sensor. If 302°F (150°C) or more is displayed, turn ignition off. Disconnect PCM connector "D". See Figure . Check for continuity between IAT sensor connector terminal No. 2 (Red/Yellow wire) and ground. If continuity exists, repair short in wiring between IAT sensor and PCM terminal D8 (Red/Yellow wire). See WIRING DIAGRAMS section. If continuity does not exist, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.