CM2150 Electronic Control System – 019-019   Engine 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.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

• Drain the cooling system.

Use the following procedure in the ISB Series 6.7L Engines (CM2100 and CM2150 Common Rail Fuel Systems) Service Manual, Bulletin 4021578. Refer to Procedure 008-018 in Section 8.

Use the following procedure in the ISC and ISL CM2150 Service Manual, Bulletin 4021569. Refer to Procedure 008-018 in Section 8.

Lift up on the locking tab and disconnect the harness from the sensor.

Remove the sensor.

Inspect the engine harness connector and coolant temperature sensor for the following:

• Cracked or broken connector shell
• Missing or damaged connector seals
• Dirt, debris, or moisture in or on the connector pins
• Corroded, bent, broken, pushed back, or expanded pins.

Measure the resistance across the sensor signal and return terminals to be sure they are within the specifications listed in the table below. If the sensor ambient conditions change, the resistance values should be measured only after 2.5 minutes of the ambient change.

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 connector to connect the harness to the sensor.

• Fill the cooling system.

Use the following procedure in the ISB Series 6.7L Engines (CM2100 and CM2150 Common Rail Fuel Systems) Service Manual, Bulletin 4021578. Refer to Procedure 008-018 in Section 8.

Use the following procedure in the ISC and ISL CM2150 Service Manual, Bulletin 4021569. Refer to Procedure 008-018 in Section 8.

• Operate the engine and check for leaks.
• Monitor the engine coolant temperature sensor with INSITE™ electronic service tool for proper operation.