This Cummins fuel pump fault document is an 8-page troubleshooting PDF for Fault Code 281 on ISB6.7 CM2150 engines. It explains the high pressure pump circuit, fault conditions, visible symptoms, diagnostic checks, and repair direction for a fuel pump pressurizing assembly imbalance.
Official Cummins fuel pump fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; High Pressure Pump; Fuel Pump Pressurizing Assembly 1 – Mechanical System Not Responding Properly or Out of Adjustment |
| Year/Revision | Last Modified: 17-Jan-2011 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 281
- 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 – Preliminary fuel system checks.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 (2007-09) engines in the DTCs group. The extract also references ISC and ISL CM2150 Service Manual, Bulletin 4021569, and ISLe CM2150 Service Manual, Bulletin 4021630, because the diagnostic steps refer to Procedure 005-025, Procedure 006-003, Procedure 006-020, Procedure 005-227, and Procedure 019-032. It covers Fault Code: 281, PID: S126, SPN: 1347, FMI: 7, with a yellow lamp and possible engine no-run or low power condition. For manufacturer information, visit Cummins official website.
Who needs this Cummins fuel pump fault manual
Workshop owners, diesel mechanics, and fleet technicians need this Cummins fuel pump fault manual when diagnosing an active or repeated inactive Fault Code 281. It is useful when the engine will not start, has low power, shows excessive pump head drain flow, or needs ECM calibration verification with INSITE™ electronic service tool.
The procedure describes how the fuel pump uses two barrel and plunger assemblies with inlet and outlet check valves to pressurize the fuel rail. The fault sets when a pumping imbalance is detected between the two high-pressure plungers inside the fuel pump. The document directs the technician to check active fault codes, measure fuel gear pump pressure, check for air in the fuel, review ECM calibration revision history on QuickServe™ Online, and clear the code after the corrected condition is detected.
Repair guidance stays tied to diagnostic results. Low fuel gear pump pressure can lead to fuel gear pump module replacement. Air bubbles point toward air entry, cavitation from severe inlet restriction, suction fuel lines, OEM fuel lines, suction-side fuel filter assemblies, or stand-pipes in the fuel tanks. If no air is found and the guided checks lead there, the document directs replacement of the high pressure fuel pump head. Full PDF available in the DiagTechPro manuals library, free account required to download.
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