| DTC P0112: | IAT Sensor Circuit Low Voltage |
| 1. | Turn the ignition switch ON (II). |
| 2. | Check the IAT SENSOR in the DATA LIST with the HDS. Is about 180 °C (356 °F) or more, or 0.08 V or less indicated? YES - Go to 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the ECM/PCM.n |
| 3. | Turn the ignition switch OFF. |
| 4. | Disconnect the MAF sensor/IAT sensor 5P connector. |
| 5. | Turn the ignition switch ON (II). |
| 6. | Check the IAT SENSOR in the DATA LIST with the HDS. Is about 180 °C (356 °F) or more, or 0.08 V or less indicated? YES - Go to 7. NO - Go to 11. |
| 7. | Turn the ignition switch OFF. |
| 8. | Jump the SCS line with the HDS. |
| 9. | Disconnect ECM/PCM connector B (44P). |
| 10. | Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 2 and body ground.
Is there continuity? YES - Repair short in the wire between the IAT sensor and the ECM/PCM (B31), then go to 13. NO - Go to 18. |
| 11. | Turn the ignition switch OFF. |
| 12. | Replace the MAF sensor/IAT sensor. |
| 13. | Reconnect all connectors. |
| 14. | Turn the ignition switch ON (II). |
| 15. | Reset the ECM/PCM with the HDS. |
| 16. | Do the ECM/PCM idle learn procedure. |
| 17. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0112 is indicated, check for poor connections or loose terminals at the IAT sensor and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.n |
| 18. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 19. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0112 is indicated, check for poor connections or loose terminals at the IAT sensor and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n |