With the air duct removed, the electrical connector unplugged, and the engine off, proceed to check the coolant temperature sensor with a standard ohmmeter by setting it on ohm x 1000, connect the positive and negative probes to both terminals on the CTS as shown in the picture.
- The normal resistance on an engine with 50 to 80 degrees F = 2,200 to 2,700 ohms. As the sensor temperature DECREASES, the resistance value will INCREASE.
If you are going to check the sensor with the engine running, make sure that the testing equipment is away from all moving parts like radiator fan and accessory belts.
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