019-019   Engine Coolant Temperature Sensor

Cold Engine

Connect an electronic service tool to the vehicle datalink.

Turn keyswitch ON.

Monitor the coolant temperature with the electronic service tool.

Compare the cool temperature value with the water temperature gauge in the vehicle dash.

If the coolant temperature on the electronic service tool is excessively higher than the water temperature, replace the coolant temperature sensor.

If the coolant temperature on the electronic service tool does

not increase with the water temperature, replace the coolant temperature sensor.

Warm Engine

Remove the coolant temperature sensor. Refer to Procedure

019-019.

Connect the coolant temperature sensor to the engine harness.

Connect an electronic service tool to the vehicle datalink.

Turn keyswitch ON.

Monitor the coolant temperature with the electronic service tool.

If the coolant temperature does

not decrease to the present ambient air temperature, replace the coolant temperature sensor.

WARNING  Do not remove the pressure cap from a hot engine. Wait until the coolant temperature is below 50°C [120°F] before removing the pressure cap. Heated coolant spray or steam can cause personal injury.

Drain the cooling system.

Lift up on the locking tab and pull the electrical connectors apart.

Remove the sensor.

Make sure the new sensor has an o-ring installed.

Lubricate the o-ring with clean engine oil.

Install the new sensor into the engine. Tighten the sensor.

Push the connectors together until they lock.

Fill the cooling system and operate the engine to check for leaks.