In-car Temperature Sensor Test.

Check for a change in resistance by heating or cooling the sensor with a hair drier.

Compare the resistance reading between the No. 1 and No. 2 terminals of the in-car temperature sensor with the specifications shown in the graph; the resistance should be within the specifications.

Fig 1: Comparing Resistance Reading Between No. 1 & No. 2 Terminals Of In-Car Temperature Sensor

Courtesy of AMERICAN HONDA MOTOR CO., INC.