Cummins ISB4.5 CM2150 Fault Code: 146 PID: 110 SPN: 110 FMI: 0 Engine Coolant Temperature – Data Valid But Above Normal Operating Range – Moderately Severe Level.

Circuit Description
The coolant temperature sensor is a variable resistor sensor and is used to measure the temperature of the engine coolant. 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.

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

Conditions for Setting the Fault Codes
The ECM detects that the coolant temperature is greater than a calibratible limit set in the ECM.

Action Taken When the Fault Code is Active
-The ECM logs the fault code immediately when the diagnostic runs and fails.
-The torque output of the engine will be reduced.
-Exhaust gas recirculation (EGR) valve operation will be disabled.

Conditions for Clearing the Fault Code
-To validate the repair, start the engine and let it idle for 1 minute.
-The ECM will turn off the amber CHECK ENGINE light and the fault code will become 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 limit for high coolant temperature.