CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – 019-019   Engine Coolant Temperature Sensor

Connect INSITE™ electronic service tool and verify the coolant temperature reading is the same on INSITE™ electronic service tool as the gauge reading.

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. Refer to Procedure 008-018 in the ISM, ISMe and QSM11 Service Manual, Bulletin 3666322, or the Signature, ISX and QSX15 Service Manual, Bulletin 3666239

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. Refer to Procedure 008-018 in the ISM, ISMe and QSM11 Service Manual, Bulletin 3666322, or the Signature, ISX and QSX15 Service Manual, Bulletin 3666239.

Operate the engine and check for leaks.

Use INSITE™ electronic service tool to monitor the engine coolant temperature sensor with for proper operation.