Cummins ISB4.5 CM2150 Fault Code: 151 PID: 110 SPN: 110 FMI: 0 Engine Coolant Temperature – Data Valid But Above Normal Operating Range – Most Severe Level.

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 electronic 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.
The engine coolant temperature value is used by the ECM for the engine protection system and engine emissions control. This fault code indicates that the engine coolant temperature has exceeded the engine protection limit.

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

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes
The ECM detects that the coolant temperature is greater than the maximum operating limits set in the ECM calibration.

Action Taken When the Fault Code is Active
-The ECM illuminates the red STOP ENGINE light immediately when the diagnostic runs and fails.
-The torque output of the engine will be reduced.
-Maximum engine operating speed will be decreased.
-The engine will be shut off if the Engine Protection Shutdown feature is enabled.

Conditions for Clearing the Fault Code
– The ECM will turn off the red STOP ENGINE light and the fault code will go inactive immediately after the coolant temperature decreases below the engine protection limit.
-This fault code can also be cleared with INSITE™ electronic service tool.

Shop Talk
This fault code indicates that coolant temperature has exceeded the engine protection limits for high coolant temperature.