Coolant Temperature Sensor

Engine Coolant Temperature Sensor Location:

1. With the key off; disconnect wire harness connector from coolant temperature sensor.

Engine Coolant Temperature Sensor:

2. Connect a high input impedance (digital) volt-ohmmeter to terminals A and B. The ohmmeter should read as follows:
- Engine/Sensor at normal operating temperature around 200° F should read approximately 700 to 1,000 ohms.
- Engine/Sensor at room temperature around 70° F ohmmeter should read approximately 7,000 to 13,000 ohms.
3. Test the resistance of the wire harness between the PCM 80-way connector terminal 26 and the sensor harness connector. Also check for continuity between PCM 80-way connector terminal 43 and the sensor harness connector. If the resistance is greater than 1 ohm, repair the wire harness as necessary.