This Cummins EGR fault document is a 17-page diagnostic procedure for Fault Code 2351 on CM2150 engines. It explains the EGR valve control circuit, the amber CHECK ENGINE lamp action, and the tests used to find shorts, connector damage, harness faults, or an EGR valve motor problem.
Official Cummins EGR fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; EGR Valve Position Circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 17 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the EGR valve motor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4B – Clear the inactive fault codes.
Applicable truck models
This procedure applies to Cummins ISB6.7 CM2150 engines in the 2007-09 group, and the extract identifies the related system as ISB, ISC, and ISL with CM2150 – EGR Valve Position Circuit. The document is written around Fault Code 2351, PID S146, SPN 2791, FMI 4, where the ECM detects voltage below normal or a shorted low source in the EGR valve control circuit. For current manufacturer information, visit the Cummins official website.
Who needs this Cummins EGR fault manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins EGR fault manual when an amber CHECK ENGINE light appears and INSITE™ reports active or inactive Code 2351. It supports step-by-step diagnosis of the EGR motor supply A, supply B, supply C, return circuit, ECM connector pins, and engine wiring harness.
The procedure states that the EGR valve is located on the air intake connection and that the EGR valve motor opens a dual-poppet valve while spring force closes it when motor current is reduced. It includes connector inspection items such as loose connectors, corroded pins, bent or broken pins, pushed back or expanded pins, moisture, missing seals, dirt, shell damage, insulation damage, and locking tab damage. Electrical checks include 3.80 to 4.50-VDC tests at the EGR motor connector and ECM engine connector, resistance checks for open circuits, short circuits between pins, and short circuits to ground with a greater than 100k ohms criterion shown in the extract. Repair direction points to cleaning connectors, repairing or replacing the engine harness, replacing the EGR valve motor when required, disabling the fault code by idling the engine for 1 minute, and clearing inactive fault codes with INSITE™.
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