SPN 110 - FMI 16 (Fault Code 146)

SPN 110 - FMI 16 (Fault Code: 146)
SPN110 FMI16
Engine Coolant Temperature Sensor Circuit

Fault Code: 146
PID(P), SID(S): P110
SPN: 110
FMI: 0/16

REASON: Engine Coolant Temperature - Data Valid But Above Normal Operational Range - Moderately Severe Level. Engine coolant temperature is above engine protection warning limit.

EFFECT: Power derate and possible engine shut down if Engine Protection Shutdown feature is enabled.

Circuitt 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.

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 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:
The ECM will turn off the fault code 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. If necessary, calibrate the ECM.
  • This fault code indicates that coolant temperature has exceeded the engine protection limits for high coolant temperature.

Read More:
SPN 110 - FMI 4 (Fault Code 145)
SPN 110 - FMI 3 (Fault Code 144)


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