CM870 and ISX Engines – FAULT CODE 2961

  Printable Version

Overview

EGR Temperature – Data Valid But Above Normal Operating Range SMALL | MEDIUM | LARGE

Circuit Description

The EGR temperature sensor measures the temperature of the exhaust gas exiting the EGR cooler. This temperature is monitored to protect the engine against the extremely high temperatures associated with EGR.

Component Location

The EGR temperature sensor is located in the EGR connection tube, downstream of the EGR differential pressure connection tube and below the integrated fuel system module (IFSM). Refer to Procedure 100-002 for a detailed component location view.

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:

• Fouled EGR cooler
• Intake manifold, charge air cooler, or EGR leaks
• Failed EGR differential pressure tubes
• Failed EGR valve
• Stuck open turbocharger control valve
• EGR differential pressure sensor reading low
• EGR valve position sensor reading low
• High exhaust temperatures
• Stuck closed variable geometry turbocharger.

NOTE: This fault code will not become active without a load in the shop. The engine must be loaded to trip this fault code and to determine if the failure has been found and fixed.

Refer to Troubleshooting Fault Code t05-2961