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Turbocharger Compressor Outlet Temperature (Calculated) – Data Valid but Above Normal Operational Range – Least Severe Level
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Overview
CODE | REASON | EFFECT |
Fault Code: 2347 PID: SPN: 2790 FMI: 0/15 LAMP: None SRT: |
Turbocharger Compressor Outlet Temperature (Calculated) – Data Valid but Above Normal Operational Range – Least Severe Level. High turbocharger compressor outlet air temperature has been calculated by the electronic control module (ECM). |
Fuel is limited in an attempt to decrease the calculated turbocharger compressor outlet air temperature. |
![]() ISB, ISC, and ISL with CM2150 – Electronic Control Module
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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 inlet 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 running.
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
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Shop Talk
Verify the electronic control module (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, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
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 failure is a failed 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 failure has been found and fixed.
Refer to Troubleshooting Fault Code t05-2347