SPN 110 - FMI 0 (Fault Code 151)

SPN 110 - FMI 0 (Fault Code: 151)
Coolant Temperature Sensor Circuit

Fault Code: 151
PID(P), SID(S): P110
SPN: 110
FMI: 0/0
Lamp: RED

REASON : Engine Coolant Temperature - Data Valid But Above Normal Operational Range - Most Severe Level. Engine coolant temperature signal indicates engine coolant temperature above engine protection critical limit.

EFFECT : Progressive power derate increasing in severity from time of alert. If Engine Protection Shutdown feature is enabled, engine will shut down 30 seconds after red STOP lamp starts flashing.

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 exhaust side of the engine near 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 down if the Engine Protection Shutdown feature is enabled.

Conditions for Clearing the Fault Code:
The ECM will turn off the red STOP ENGINE light immediately after the coolant temperature decreases below the engine protection limit.

Shop Talk:
Verify the ECM calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM.

Read More:
SPN 110 - FMI 16 (Fault Code 146)
SPN 110 - FMI 4 (Fault Code 145)


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