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

INTAKE AIR TEMPERATURE SENSOR CHECK




1. Disconnect the mass airflow sensor connectors.
2. Measure resistance between terminal No. 1 and No. 4.

Standard value:
13 - 17 k& [at -20 degrees C (-4 degrees F)]
5.3 - 6.7 k& [at 0 degrees C (32 degrees F)]
2.3 - 3.0 k& [at 20 degrees C (68 degrees F)]
1.0 - 1.5 k& [at 40 degrees C (104 degrees F)]
0.56 - 0.76 k& [at 60 degrees C (140 degrees F)]
0.30 - 0.45 k& [at 80 degrees C (176 degrees 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.