Cummins ISB4.5 CM2150 Fault Code: 214 PID: 175 SPN: 175 FMI: 0 Engine Oil Temperature High – Data Valid But Above Normal Operating Range – Most Severe Level.

Circuit Description
The engine oil temperature sensor is a variable resistor sensor and is used to measure the temperature of the engine oil in the oil rifle. The electronic control module (ECM) supplies 5 volts to the engine oil temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the engine oil temperature. When the oil temperature is cold, the sensor or thermistor resistance is high. The ECM signal voltage only pulls down a small amount through the sensor to a ground. Therefore, the ECM senses a high signal voltage or low temperature. When the oil temperature is warm, the sensor resistance is low. The signal voltage pulls down a large amount. Therefore, the ECM senses a low signal voltage, or a high temperature. The engine oil temperature sensor is used to monitor the engine oil temperature. If the temperature exceeds a calibration limit, an engine protection fault code will be triggered.

Component Location
The engine oil temperature sensor is located in the oil rifle.

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 engine oil temperature is greater than 122°C [252°F] for 5 seconds.

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 down if the Engine Protection Shutdown feature is enabled.

Conditions for Clearing the Fault Code
-To validate the repair, start the engine and let it idle for 1 minute.
-The fault code status displayed by the INSITE™ electronic service tool will change to INACTIVE immediately after the oil temperature decreases below the engine protection limi and the diagnostic runs and passes.
-The ECM will turn off the red STOP ENGINE lamp after the diagnostic runs and passes.
-The “Reset All Faults” command in the INSITE™ electronic service tool can be used to clear active and inactive fault codes.

Shop Talk
This fault code indicates that the engine oil temperature has exceeded the maximum engine protection limit for oil temperature. Troubleshoot the cause of high engine oil temperature.