This Cummins 271 fault code document is a troubleshooting guide for Fault Code 271 on CM2150 engines. It explains a low-voltage or short-to-low-source condition in the fuel pump pressurizing assembly circuit, with guided checks using INSITE™ and multimeter resistance tests. The file is useful when an engine runs poorly at idle, has low power, or shows fuel rail pressure higher than commanded.
Official Cummins 271 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC and ISL with CM2150 |
| System/Group | DTCs; fuel pump actuator circuit; fuel pump pressurizing assembly 1 circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 12 |
| 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 fuel pump actuator and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Clear the fault codes.
Applicable truck models
This manual applies to Cummins ISB6.7 CM2150 engines from the 2007-09 coverage group. The extract also identifies the procedure as applying to ISB, ISC and ISL with CM2150 fuel pump actuator circuit diagnostics. It does not list truck chassis models, so use the engine family, ECM type, and active DTC information to confirm fitment before repair. For official engine and service information, visit Cummins official website.
Who needs this Cummins 271 fault code manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when Fault Code 271 is active or intermittent. It gives a step-by-step path for checking the fuel pump actuator connector, ECM connector, engine harness, pin-to-pin shorts, and pin-to-ground shorts.
The diagnostic notes describe the PWM driver in the ECM, the normally open fuel control actuator, and the relationship between desired rail pressure and sensed rail pressure. The procedure directs the technician to cycle the keyswitch, connect INSITE™ electronic service tool, read active and inactive fault codes, inspect connector pins, disconnect the fuel pump actuator, and verify whether Fault Code 272 becomes active while Fault Code 271 becomes inactive. If the actuator test points to a failed component, the document refers to Procedure 019-117 (Fuel Pump Actuator). If harness damage or short circuits are found, it refers to Procedure 019-043 (Engine Wiring Harness). Resistance checks use a greater than 100k ohms specification and reference Procedure 019-360 for resistance measurement techniques.
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