Circuit Description
WARNING: This page is about a different car, the 2000 Isuzu Rodeo and 2000 Isuzu Amigo. However, it is still accessible from the selected car via links, so may be relevant.
Intake Air Temperature (IAT) sensor is a thermistor, which varies resistance based on temperature. As temperature of sensor increases, resistance decreases. Low temperature will result in a high signal voltage. DTC will set when PCM senses IAT sensor voltage is greater than 5 volts.
Conditions required to set DTC are:
- Engine running for more than 4 minutes.
- Vehicle speed is less than 20 MPH.
- MAF value is less than 20 grams per second.
- ECT signal temperature is greater than 140°F (60°C).
- IAT signal voltage indicates an intake air temperature less than -38°F (-39°C) for 12.5 seconds over a 25-second period.