Intake Air Temperature (IAT) Sensor

The intake air temperature sensor is built into the manifold absolute pressure (MAP) sensor. The sensor is a resistor that changes the signal voltage depending on the temperature of the air entering the intake manifold.

Based on the intake air temperature sensor signal, the ECM corrects the required fuel delivery (basic fuel injector open time).

CIRCUIT DIAGRAM - INTAKE AIR TEMPERATURE (IAT) SENSOR

TROUBLESHOOTING HINTS

Under the following conditions, the Malfunction Indicator Lamp (MIL) illuminates and the corresponding diagnostic trouble code is output to the HI-SCAN (PRO) tester.

• When the intake air temperature detected by the sensor is below -40°C or above 120°C.

INSPECTION USING HI-SCAN (PRO) TESTER

WIRING INSPECTION

SENSOR INSPECTION

1. Using a multimeter, measure the resistance between terminals 3 and 4 of the intake air temperature sensor connector.

2. If the measured resistance differs from the specified values, replace the Intake Air Temperature (IAT) Sensor assembly.