This Cummins 2265 troubleshooting document is a fault-code procedure for the electric fuel lift pump circuit on CM2150 engines. It explains Fault Code 2265, PID S126, SPN 1075, FMI 3, where high voltage or an open condition is detected at the fuel lift pump signal circuit. The procedure is written for diagnostic work with INSITE™ electronic service tool, multimeter checks, connector inspection, harness testing, and ECM decision points.
Official Cummins 2265 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISC and ISL with CM2150 electric fuel lift pump circuit |
| System/Group | DTCs; Electric Lift Pump for Engine Fuel Supply Circuit – Voltage Above Normal or Shorted to High Source |
| Year/Revision | Last Modified: 20-Jul-2010 |
| 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 electric fuel control lift pump.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Clear the fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines listed for 2007-09 DTC coverage. The extract also names ISC and ISL with CM2150 in relation to the electric fuel lift pump circuit and refers to ISB CM2150 Service Manual, Bulletin 4021578, plus ISC and ISL CM2150 Service Manual, Bulletin 4021569, for fuel lift pump procedures. For manufacturer information, visit Cummins official website.
Who needs this Cummins 2265 troubleshooting manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this Cummins 2265 troubleshooting manual when an amber CHECK ENGINE light appears and Fault Code 2265 is active or intermittent. It is useful when testing the electric fuel lift pump, engine harness, ECM connector pins, diagnostic supply voltage, return circuit continuity, and pin-to-pin short conditions.
The diagnostic sequence starts with active fault-code confirmation using INSITE™ electronic service tool. It then checks the engine harness and electric fuel control lift pump connector pins for loose connectors, corrosion, bent or broken pins, pushed back or expanded pins, moisture, damaged seals, dirt, broken connector shells, wire insulation damage, and locking-tab damage. Resistance checks include an open-circuit test in the lift pump with a less than 10 ohms specification, a return-circuit open test, and an engine-harness open test.
The voltage checks require the keyswitch ON and a minimum two-minute wait before measurement. The document specifies 2.5 to 4.0-VDC between the fuel lift pump SUPPLY and RETURN pins at the lift pump connector and at the engine harness ECM connector port. Later steps include checking resistance from the fuel lift pump SUPPLY pin to all other ECM connector pins, with a greater than 100k ohms specification for the pin-to-pin short test. The repair paths point to connector cleaning, harness repair or replacement, ECM replacement authorization, and final clearing of inactive fault codes.
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