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

INTAKE AIR TEMPERATURE SENSOR CHECK





1. Disconnect the mass airflow sensor connector.
2. Measure resistance between terminal 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.

Normal condition:






5. If resistance does not decrease as heat increases, replace the mass airflow sensor.