CM870 and ISX Engines – FAULT CODE 2347

  Printable Version

Overview

Turbocharger Compressor Outlet Air Temperature SMALL | MEDIUM | LARGE

Circuit Description

The turbocharger compressor outlet air temperature is calculated by the ECM. Turbocharger compressor outlet air temperature is calculated 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 air temperature sensor in the system. The turbocharger compressor outlet air temperature is a calculation of the temperature of the air after it is compressed by the turbocharger compressor, but before exhaust gas from the EGR connection tube is mixed into the system, and before it enters the charge air cooler.

Shop Talk

Note: This fault code may become active if the protective shipping sticker is not removed from the port located on the end opposite of the connector. When installing a new turbocharger control valve, make sure the adhesive cover is removed.

Note: Before performing the INSITE™ electronic service tool EGR Valve and EGR Valve/Turbocharger Operational Test, be sure the ECM Calibration Software Phase is updated to the latest Software Phase. The ECM Calibration Phase Software can be checked in INSITE™ electronic service tool, under ‘Features and Parameters’. Expand the selection for ‘System ID and Dataplate’ and go to ‘Calibration Information’. If the Software Phase is earlier than shown below, recalibrate the ECM using the January 2006 INCAL™ CD-ROM, or later. Engines with the Software Phase listed below, or later, do not require a recalibration.

ISX engines with CM870 (engines built after January 2004) require Software Phase 06050302.

ISX engines with CM870 (engines built before January 2004) require no changes at this time.

This is a warrantable calibration change.

Possible causes 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 turbocharger control valve
• Stuck variable geometry turbocharger.

Note: Unless the malfunction is a damaged barometric pressure sensor or intake manifold pressure sensor, this fault code will not become active without a load in the shop. The engine will 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