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In-Car Temperature Sensor Test

NOTE: Before testing the sensor, check for climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS  ).
  1. Remove the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR REPLACEMENT  ).
  2. Test the in-car temperature sensor while holding it in front of the dashboard center vent:
    • Measure the resistance with the system set to Max Cool.
    • Measure the resistance with the system set to Max Hot.
  3. Compare the resistance reading between terminals No. 2 and No. 3 of the in-car temperature sensor with the specifications shown in the graph; the resistance should be within the specifications.
    Fig 1: Checking Resistance In-Car Temperature Sensor
    G07354726Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. If the resistance is not as specified, replace the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR REPLACEMENT  ).
    NOTE: Incorrectly applying power and ground to the in-car temperature sensor will damage it. Follow the instructions carefully.
  5. Connect battery power to terminal No. 1 of the in-car temperature sensor, and ground terminal No. 4; the aspirator fan should run.
  6. If the aspirator fan did not run in step  5, replace the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR REPLACEMENT  ).
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