CM2150 Electronic Control System – FAULT CODE 2357

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Overview

ISB, ISC, and ISL – EGR Valve Circuit SMALL | MEDIUM | LARGE

Circuit Description

The exhaust gas recirculation (EGR) valve is opened by a motor located on top of the EGR valve. A motor shaft extends from the motor and contacts the dual-poppet valve to open the EGR valve. The EGR valve motor does not actually retract the EGR valve. The motor current is reduced and the spring pushes the EGR valve closed.

Component Location

The EGR valve location can vary, depending on the engine application. Use the following procedure for a detailed component location view. Refer to Procedure 100-002 in Section E

Conditions for Running the Diagnostics

This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes

This fault code is set when the duty cycle required to open the EGR valve is greater than 95 percent for 3 seconds. The EGR valve controller will try to open the EGR valve again after 10 seconds. The fault code is triggered after three failed attempts.

Action Taken When the Fault Code is Active

• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• The EGR valve will stop responding to commands and the spring will close the EGR valve.

Conditions for Clearing the Fault Code

The ECM will turn off the amber CHECK ENGINE light and clear the fault code after the keyswitch is cycled and the diagnostic runs and passes. The fault code will be inactive at key-on. It will only go active if the EGR valve is commanded open and the EGR valve is unable to move to the commanded position.

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, calibrate the ECM. Use the following procedure in the corresponding Troubleshooting and Repair Manual for the engine being serviced. Refer to Procedure 019-032 in Section 19.

This fault code is triggered when the EGR valve motor is unable to move the EGR valve in the open position. This is normally caused by a restriction in the EGR valve not allowing the EGR valve to move to the commanded position.

The fault code will be inactive at key-on. It will only go active if the EGR valve is commanded open and the EGR valve is unable to move to the commanded position.

The aftertreatment system must be inspected after making the appropriate repair outlined in this fault code troubleshooting tree. Progressive damage to the aftertreatment system may have occurred. Perform the aftertreatment initial check procedure to test for a damaged diesel particulate filter (DPF).

• For reuse guidelines for ISB CM2150 engines, use the following procedure in the ISB CM2150 Service Manual, Bulletin 4021578. Refer to Procedure 014-013 in Section 14.
• For reuse guidelines for ISC and ISL CM2150 engines, use the following procedure in the ISC and ISL CM2150 Service Manual, Bulletin 4021569. Refer to Procedure 014-013 in Section 14.

Possible causes of this fault code include:

• Fuel Injector wiring harness shorted to ground, open circuit, or shorted to power supply.

Refer to Troubleshooting Fault Code t05-2357