CM870 and ISX Engines – FAULT CODE 2353

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Overview

EGR Valve Motor Output Circuit SMALL | MEDIUM | LARGE

Circuit Description

The ECM controls the EGR valve, opening and closing it based on various engine operating conditions. The EGR valve is opened and closed by a DC motor that receives voltage from the ECM on the EGR valve motor (+) and EGR valve motor (-) circuits. To open the valve, the motor receives voltage on the EGR valve motor (+) circuit. To close the valve, the motor receives voltage on the EGR valve motor (-) circuit.

Component Location

The EGR valve and motor assembly is located on the exhaust side of the engine. It is mounted near the accessory bracket towards the front of the engine. Refer to Procedure 100-002 for a detailed component location view.

Shop Talk

The ECM monitors the current draw of this circuit. If the ECM detects excessive current, it sets the Fault Code 2353 active.

NOTE: Prior to running the INSITE™ electronic service tool EGR Valve and EGR Valve/Turbocharger Operational Test, the ECM Calibration Software Phase could possibly need to be 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 include:

• EGR valve motor (+) or (-) leads shorted together in the engine harness, EGR valve extension harness, EGR valve motor or ECM
• Low EGR valve motor internal resistance.

Refer to Troubleshooting Fault Code t05-2353