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 No. 1 and No. 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.