Cummins ISX15 CM2250 (2010-12) Fault Code: 2347 PID: 404 SPN: 2629 FMI: 15 Turbocharger Compressor Outlet Temperature (Calculated)- Data Valid But Above Normal Operating Range- Least Severe Level

Circuit Description
The turbocharger compressor outlet air temperature is calculated by the ECM. Turbocharger compressor outlet air temperature is derived by the ECM, based on engine operating conditions such as turbocharger compressor intake air temperature, barometric pressure, turbocharger speed, engine speed, intake manifold air temperature, and intake manifold pressure.

Component Location
There is not a physical turbocharger compressor outlet temperature sensor in the system. The turbocharger compressor outlet air temperature is a calculation of temperature of the air after it is compressed by the turbocharger compressor, but before exhaust gas recirculation (EGR) is mixed into the system, and before it enters the charge-air cooler.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is operating.

Conditions for Setting the Fault Codes
The ECM detects that the calculated turbocharger compressor outlet temperature is greater than 238?C [460?F].

Action Taken When the Fault Code is Active
The ECM logs the fault code immediately when the temperature threshold is exceeded.
Fuel is limited in an attempt to decrease the calculated compressor outlet temperature.
Conditions for Clearing the Fault Code
To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop-and-go city driving and steady state highway driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer Test, utilize a routine that incorporates acceleration and motoring events, steady state highway operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
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 Talk
Possible caused of this fault code include:

Air intake leaks allowing hot under-hood air to enter the intake system
Faulty intake manifold pressure readings
High turbocharger speed readings
Faulty barometric pressure readings
Stuck variable geometry turbocharger.
NOTE: Unless the issue is a malfunctioning barometric pressure sensor or intake manifold pressure sensor, this fault code will most likely not be active with no load in the shop. The engine will most likely need to be loaded to trip this fault code, and to determine if the malfunction has been found and repaired.

Possible Cause:
1) Barometric air pressure sensor failure
2) Intake manifold pressure sensor failure
3) ECM calibration