This document is a fault code 271 DTCs troubleshooting manual for the fuel pump actuator circuit. It covers a voltage below normal or shorted-to-low-source condition on Engine Fuel Pump Pressurizing Assembly 1 Circuit, with diagnostic steps for the actuator, engine harness, ECM connector, and ECM calibration.
Official fault code 271 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also referenced for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, and other listed CM2150/CM2220 engines in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Fuel Pump Actuator Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Year unknown; last modified 11-Jun-2010 and 20-Jul-2010 |
| Pages | 15 |
| 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
- 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 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins engines listed in the procedure table, with the file classification centered on ISB6.7 CM2250 DTC troubleshooting. The extract also lists ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISB6.7, ISD4.5 and ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, and ISZ13 CM2150 in the associated procedures table. See the manufacturer at Cummins official website.
Who needs this fault code 271 DTCs manual
This manual is for diesel technicians, fleet maintenance staff, and workshop owners diagnosing low signal voltage or short-to-ground conditions in the electronic fuel pump actuator circuit. It is useful when INSITE™ shows Fault Code 271 active, poor idle, low power, disabled regeneration, EGR closure, or reduced torque linked to the fuel pump actuator driver circuit.
The troubleshooting sequence starts with checking whether Fault Code 271 is active, then inspecting the fuel pump actuator connector for loose connectors, corrosion, bent or broken pins, pushed-back pins, moisture, damaged seals, debris, shell damage, wire insulation damage, and damaged locking tabs. It then checks circuit response, verifies whether Fault Code 272 becomes active while Fault Code 271 becomes inactive, and continues into ECM connector and engine harness checks.
The later guided steps cover pin-to-pin and pin-to-ground short checks using resistance measurements, with a greater-than-100k-ohms specification shown in the extract. The repair paths point to cleaning connector pins, repairing damaged harnesses or connectors, replacing or repairing the engine wiring harness where a short is detected, checking ECM calibration revision history, using Procedure 019-032 for calibration if required, and clearing faults with INSITE™ after reconnecting all components.
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