Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection

INTAKE AIR TEMPERATURE SENSOR CHECK




1. Disconnect the mass airflow sensor connectors.
2. Measure resistance between terminals 1 and 4.

Standard value:
13 - 17 kOhms [at - 20 °C (- 4 °F)]
5. 3 - 6.7 kOhms [at 0 °C (32 °F)]
2. 3 - 3.0 kOhms [at 20 °C (68 °F)]
1. 0 - 1.5 kOhms [at 40 °C (104 °F)]
0.56 - 0.76 kOhms [at 60 °C (140 °F)]
0.30 - 0.45 kOhms [at 80 °C (176 °F)]




3. If not within specifications, replace the mass airflow sensor.




4. Measure resistance while heating the sensor using a hair dryer.
5. If resistance does not decrease as heat increases, replace the mass airflow sensor.