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

NOTE:
To perform a complete test of Intake Air Temperature sensor and its circuitry, refer to appropriate Diagnostic Chart. To test the sensor only, refer to the following:

Charge Air Temperature Sensor And Connector:

1. Disconnect the wire harness connector from the sensor.

2. Test the resistance of the sensor with an input impedance (digital) volt-ohmmeter. The resistance (as measured across the sensor terminals) should be less than 1340 ohms with the engine warm. Refer to the Coolant Temperature sensor/Charge Air Temperature sensor resistance chart. Replace the sensor if it is not within the range of resistance specified in the chart.

3. Test the resistance of the wire harness. Do this between the Powertrain Control Module wire harness connector terminal 21, and the sensor connector terminal. Also check between terminal 4 to the sensor connector terminal. Repair the wire harness as necessary if the resistance is greater than 1 ohm.



TEMPERATURE RESISTANCE (OHMS)

°C °F MIN MAX


-40 -4O 291,490 381,710

-20 -4 85,850 108,390

-10 14 49,250 61,430

0 32 29,330 35,990

10 50 17,990 21,810

20 68 11,370 13,610

25 77 9,120 10,880

30 86 7,370 8,750

40 104 4,900 5,750

50 122 3,330 3,880

60 14O 2,310 2,670

70 158 1,630 1,870

80 176 1,170 1,340

90 194 860 970

100 212 640 720

110 230 480 540

120 248 370 410