This Cummins code 272 document is a troubleshooting manual for the fuel pump actuator circuit on CM2150 engines. It explains the fault logic, connector checks, voltage tests, resistance checks, harness inspection, ECM checks, and fault-code clearing steps used with INSITE™.
Official Cummins code 272 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC and ISL with CM2150; file group lists ISB6.7 CM2150 (2007-09) |
| System/Group | Fuel Pump Actuator Circuit; ISB6.7 CM2150 (2007-09) / DTCs |
| Publication no. | Not shown in the extract |
| Year/Revision | Year unknown; last modified 20-Jul-2010 and 17-Jan-2011 |
| Pages | 14 |
| 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 PDF applies to Cummins ISB, ISC and ISL engines with CM2150 control, with the file classification specifically naming ISB6.7 CM2150 (2007-09). The document is written around Fault Code 272, PID S126, SPN 1347, FMI 3, where the Fuel Pump Pressurizing Assembly 1 Circuit has voltage above normal or is shorted to a high source. It identifies the fuel pump actuator on the engine-mounted fuel pump housing and includes the engine wiring harness and ECM as possible circuit-related causes. For official engine and service information, visit Cummins.
Who needs this Cummins code 272 manual
Workshop technicians, diesel electricians, and fleet maintenance teams use this Cummins code 272 manual when an amber CHECK ENGINE light is active and the engine will not run or runs poorly. The procedure supports diagnosis of open circuits, shorts to positive voltage, loose pins, corroded pins, connector moisture, damaged seals, harness resistance, intermittent opens, and ECM-related checks.
The test flow starts by reading active fault codes with INSITE™ electronic service tool, then moves through fuel pump actuator connector inspection and actuator continuity. It gives measured decision points including 0.1 to 5 ohms across actuator signal and return, greater than 3.0-VDC for diagnostic signal voltage checks, less than 10 ohms for return and harness continuity checks, and greater than 100k ohms for pin-to-pin short-circuit testing. Later steps cover ECM connector inspection, signal-voltage measurement at the ECM connector, engine harness open-circuit checks, pin-to-pin short checks, and inactive fault verification after reconnecting components.
Repair directions in the extract include cleaning connectors and pins, repairing damaged harnesses or connector pins under Procedure 019-043, replacing the fuel pump actuator under Procedure 019-117, and replacing the ECM only after authorization under Procedure 019-031. The closing steps instruct the technician to start the engine, idle it for 1 minute, verify the fault code is inactive, and clear inactive fault codes with INSITE™.
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