PACCAR PX-9 CM2350 (2013-17) Fault Code:2789 PID:110 SPN:110 FMI:1 Engine Coolant Temperature - Data Valid But Below Normal Operational Range - Moderately Severe Level

Reason:
Engine Coolant Temperature - Data Valid But Below Normal Operational Range - Moderately Severe Level. Engine coolant temperature is below normal operating temperature limits.

Effect:
None on performance

Circuit Description:
The coolant temperature sensor is a variable resistor sensor and is used to measure the temperature of the coolant of the engine. The engine control module (ECM) supplies 5 volts to the coolant temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the coolant temperature.

Component Location:
The engine coolant temperature sensor is located on the thermostat housing.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes:
Engine coolant temperature was less than 60°C [140°F] for over 1 hour during a period of extended idle.

Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The Reset All Faults command in INSITE electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
If this fault indicates that coolant temperature is below a calibratible limit set in the ECM. Refer to Engine Coolant Temperature Below Normal troubleshooting symptom tree tree in the base engine service manual.

Possible Causes:
1) Inactive fault codes
2) Faulty ECM

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