P0112
DTC P0112: IAT Sensor Circuit Low Voltage1. Turn the ignition switch ON (II).
2. Check the IAT with the scan tool.
Is 302 °F (150 °C) or higher (or H-Limit in Honda mode of PGM Tester), or 0 V indicated?
YES - Go to step 3.
NO - Go to step 8.
3. Disconnect the IAT sensor 2P connector.
4. Check the IAT with the scan tool.
Is 302 °F (150 °C) or higher (or H-Limit in Honda mode of PGM Tester), or 0 V indicated?
YES - Go to step 5.
NO - Replace the IAT sensor.
5. Turn the ignition switch OFF.
6. Disconnect PCM connector C (31P).
7. Check for continuity between IAT sensor 2P connector terminal No.2 and body ground.
Is there continuity?
YES - Repair short in the wire between the PCM (C25) and the IAT sensor.
NO - Substitute a known-good PCM and recheck. If normal voltage is indicated, replace the original PCM.
8. Check the temperature reading on the scan tool. Be aware that if the engine is warm, the reading will be higher than ambient temperature. If the engine is cold, the IAT and ECT will have the same value.
Is the correct ambient temperature indicated?
YES - Intermittent failure, system is OK at this time.
Check for poor connections or loose wires at the IAT sensor and at the PCM.
NO - Replace the IAT sensor.