IAT SENSOR CIRCUIT HIGH VOLTAGE
Intake Air Temperature (IAT) sensor is a thermistor that
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 sees an IAT sensor voltage of
greater than 5 volts.
SES Service Engine Soon light
- Defective IAT sensor
- Loose or corroded connection at IAT sensor
- Open in IAT ground circuit or signal circuit
- Short to voltage in IAT signal circuit or reference circuit
- IAT harness and/or wiring routed too close to high-voltage wiring such as alternator, spark plug cables, etc.