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.
Test yourself
A quick Hyundai Elantra CN7 quiz: every answer comes with an explanation and a link to the manual page.