Circuit DescriptionThe exhaust gas temperature is calculated by the electronic control module (ECM). The exhaust gas temperature is derived by the ECM, based on engine operating conditions such as intake manifold air temperature, engine speed, injection timing, intake manifold pressure, and fuel flow.

Component LocationThere is not a physical exhaust gas temperature sensor in the system. The exhaust gas temperature is a calculation of exhaust gas temperature before the turbocharger, and is also known as turbine intake temperature.

Note: Some original equipment manufacturers (OEM) have pyrometer gauges mounted in their chassis. Pyrometers measure turbine outlet exhaust gas temperature leaving the turbocharger and will not equal the value monitored with the exhaust gas temperature parameter with INSITE? electronic service tool.

Conditions for Running the DiagnosticsThis diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault CodesThe ECM detects that the calculated turbine intake temperature is greater than a calibratible value.

Action Taken When the Fault Code is ActiveThe ECM logs the fault code immediately when the temperature threshold is exceeded.Fuel is limited in an attempt to decrease the temperature of the exhaust gas entering the turbocharger.Conditions for Clearing the Fault CodeTo validate the repair, start the engine and let it idle for 1 minute.The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults.

Shop TalkThis fault code is an information fault code, indicating that the engine has been derated for high turbine intake temperature (exhaust temperature). No troubleshooting is necessary for this fault code. It is only an indicator that the engine power was derated to limit the exhaust temperature.

If the condition continues to exist, Fault Code 2451 will become active.

Possible Cause:1) ECM calibration