This Cummins ISB EGR troubleshooting document is a fault-code procedure for Cummins ISB, ISC, and ISL engines with CM2150, focused on Fault Code 2272. It explains an EGR valve position circuit voltage-below-normal or short-to-low-source condition, the amber lamp response, and the guided electrical checks used with INSITE™.
Official Cummins ISB EGR troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; EGR Valve Position Circuit |
| 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 file applies to Cummins ISB, ISC, and ISL engines using the CM2150 control system, including the ISB6.7 CM2150 (2007-09) coverage group shown in the file data. The procedure is not a full engine manual; it covers Fault Code 2272, SPN 27 FMI 4/4, where the ECM detects that all EGR valve position sensors are reading high or all are reading low. For official manufacturer information, visit Cummins.
Who needs this Cummins ISB EGR troubleshooting manual
Workshop owners, diesel mechanics, and diagnostic technicians need this ISB EGR troubleshooting manual when an amber CHECK ENGINE light is linked to the EGR valve position circuit. It is useful when checking the EGR valve motor connector, +5 volt sensor supply, return circuit, ECM connector pins, engine harness continuity, shorts between signal circuits, and shorts to ground.
The procedure states that the EGR valve is located on the air intake connection and that EGR valve actuation will be disabled while the code is active. It also directs technicians to verify ECM calibration, review QuickServe® Online calibration history, and recalibrate when applicable. The guided steps include checking for Fault Code 352, inspecting loose or damaged connector pins, measuring 4.75 to 5.25-VDC supply voltage, using resistance checks with a multimeter, repairing or replacing the engine harness, and clearing inactive codes after repair. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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