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Cummins ISB CM550 (1990-94) Fault Code: 146 PID: 110 SPN: 110 FMI: 0 Coolant Temperature – Engine Protection

Circuit Description
The coolant temperature sensor (CTS) is used by the electronic control module (ECM) to monitor
the temperature of the engine coolant. The coolant temperature is used by the ECM for the
engine protection system and the timing and fueling control.

Component Location
The coolant temperature sensor is located on top of the thermostat housing.

Shop Talk
Make sure the airflow through the radiator is not obstructed.

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