Engine Coolant Temperature – Data Valid But Above Normal Operational Range – Least Severe Level
|Fault Code: 2963
Engine Coolant Temperature – Data Valid But Above Normal Operational Range – Least Severe Level. Engine coolant temperature is above the engine coolant temperature engine protection warning limit.
Power derate and possible engine shut down if engine protection shut down feature is enabled.
ISB, ISC, and ISL – Engine Coolant Temperature Sensor Circuit
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 for engine emissions control. This fault code indicates that the engine coolant temperature has exceeded the engine protection limit.
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.
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.
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. Refer to Procedure 019-032 in Section 19