This Cummins fault 449 document is a troubleshooting PDF for injector metering rail number 1 pressure above normal operating range. It explains how the ECM detects excessive fuel rail pressure, what the amber CHECK ENGINE lamp means, and which guided checks apply before clearing the code. The file is intended for service use with Cummins INSITE and related engine service manuals.
Official Cummins fault 449 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB Series 6.7 L, QSB Series 3.3L, ISBe and ISDe Series 4.5 L and 6.7L, ISC, ISL, and ISLe CM2150 procedures |
| System/Group | ISB6.7 CM2150 (2007-09) / DTCs; Fuel System |
| Publication no. | Not shown for this PDF; referenced service manual bulletins include 4021578, 4021540, 4021597, 4021569, and 4021630 |
| Year/Revision | Last Modified: 08-Jan-2008; later sections show Last Modified: 20-Jul-2010 |
| Pages | 20 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code Path Selection
- Overview
- Circuit Description
- FAULT CODE 449 Injector Metering Rail Number 1 Pressure – Data Valid But Above Normal Operating Range – Most Severe Level
- 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 high-pressure fuel rail drain line restriction.
- Guided Step 3 – Inspect the fuel pressure relief valve.
- Guided Step 4 – Inspect the rail fuel pressure sensor.
- Guided Step 5 – Clear the fault codes.
Applicable truck models
This PDF applies to Cummins engine troubleshooting rather than a specific truck chassis. The file information identifies ISB6.7 CM2150 (2007-09) DTC coverage, while the sampled pages also reference procedures for QSB3.3, ISBe, ISDe, ISC, ISL, and ISLe CM2150 engines. It covers fuel rail pressure diagnostics, the high-pressure relief valve on the fuel rail, fuel drain line restriction checks, rail fuel pressure sensor accuracy, and related active codes such as 559, 1117, 1911, and 2311. For current engine support, see the Cummins official website.
Who needs this Cummins fault 449 manual
Workshop owners, diesel mechanics, and fleet technicians need this Cummins fault 449 manual when an engine logs SPN 157 FMI 0 with possible engine noise or derate. It is useful for confirming the fault with INSITE, checking return-line restrictions, inspecting relief valve part numbers or tampering, and verifying rail pressure sensor readings after pressure is relieved.
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