Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection
INTAKE AIR TEMPERATURE SENSOR CHECKIntake air temperature sensor 1
1. Disconnect the mass airflow sensor connector.
2. Measure the resistance between terminal No. 1 and terminal No. 4.
Standard value:
13 - 17 kohms [at -20 °C (-4 °F)]
5.4 - 6.6 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)]
0.31 - 0.43 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 the resistance does not decrease as heat increases, replace the mass airflow sensor.
Intake air temperature sensor 2
1. Disconnect the intake air temperature sensor 2 connector.
2. Measure the resistance between terminal No. 1 and terminal No. 2.
Standard value:
13 - 18 kohms [at -20 °C (-4 °F)]
5.1 - 6.9 kohms [at 0 °C (32 °F)]
2.0 - 3.0 kohms [at 20 °C (68 °F)]
0.9 - 1.5 kohms [at 40 °C (104 °F)]
0.40 - 0.78 kohms [at 60 °C (140 °F)]
0.23 - 0.42 kohms [at 80 °C (176 °F)]
3. If not within specifications, replace the intake air temperature sensor 2.
4. Measure resistance while heating the sensor using a hair dryer.
5. If the resistance does not decrease as heat increases, replace the intake air temperature sensor 2.