Caution: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

1. Drain the cooling system. Refer to Cooling System Draining and Filling.
2. If equipped with regular production option (RPO) MN5, disconnect the engine harness electrical connector (3) from the engine coolant temperature (ECT) sensor.



3. If equipped with RPO M86, disconnect the engine harness electrical connector (3) from the ECT sensor.



4. Carefully remove the ECT sensor.

Caution: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

1. If you are reinstalling the original sensor, or if you are installing a NEW sensor without a sealer, coat the threads with sealant. Refer to Adhesives, Fluids, Lubricants, and Sealers.

Caution: Refer to Component Fastener Tightening Caution in the Preface section.

2. Install the ECT sensor and tighten to 20 N·m (15 lb ft).



3. If equipped with RPO M86, connect the engine harness electrical connector (3) to the ECT sensor.



4. If equipped with RPO MN5, connect the engine harness electrical connector (3) to the ECT sensor.
5. Fill the cooling system. Refer to Cooling System Draining and Filling.