* Faulty IAT Sensor: The sensor itself might be malfunctioning, providing an incorrect reading. This is the most common cause.
* Wiring Problems: A short circuit in the wiring harness leading to the IAT sensor can cause a high voltage reading. This could be a break in the insulation causing a short to voltage or a short to ground.
* Connectors: Corrosion or damage to the connector for the IAT sensor can also cause intermittent or constant high voltage readings.
* Rarely: A problem with the PCM itself, though this is less likely.
Troubleshooting Steps:
1. Check the IAT Sensor: Visually inspect the sensor for any physical damage. It's usually located in the intake air tube. You might need to consult a repair manual or online resources for your specific S-10 model to find its exact location.
2. Check the Wiring: Inspect the wiring harness connected to the IAT sensor for any breaks, chafing, or corrosion. Pay close attention to the connector itself.
3. Check the Connector: Carefully inspect the connector at both the sensor and the harness. Clean any corrosion with electrical contact cleaner.
4. Test the Sensor (Advanced): You can test the sensor's resistance using a multimeter. Consult a repair manual for the correct resistance values at different temperatures.
5. Scan Tool: A scan tool will help to verify the code and possibly give more specific information (such as the exact voltage reading).
Important Note: If you are not comfortable working with automotive electrical systems, it's best to take your vehicle to a qualified mechanic for diagnosis and repair. Incorrectly diagnosing or repairing this issue can potentially lead to further damage.
