This Cummins fault 2266 document is a troubleshooting PDF for the electric fuel lift pump circuit and its related diagnostic checks. It explains the circuit description, fault conditions, ECM response, connector inspections, harness resistance tests, lift pump replacement decision points, and final fault-code clearing steps.
Official Cummins fault 2266 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISC and ISL with CM2150 and ISB CM2150 service information |
| System/Group | DTCs; electric fuel lift pump circuit for engine fuel supply |
| Publication no. | Not shown in 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 electric fuel lift pump.
- Guided Step 3 – Check the engine harness.
- Guided Step 4 – Clear the fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines in the 2007-09 DTC group. The extract also identifies ISC and ISL with CM2150 in the electric fuel lift pump circuit heading, and references ISB CM2150, ISC CM2150, and ISL CM2150 fuel lift pump service procedures where replacement is required. For manufacturer support and current service resources, visit Cummins official website.
Who needs this Cummins fault 2266 manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins fault 2266 manual when an amber CHECK ENGINE light is linked to low signal voltage, a short to low source, high current, or a stalled electric priming pump motor. It is useful when using INSITE™ electronic service tool to confirm active or inactive fault codes and verify circuit response after the 30-second key-on lift pump run period.
The procedure describes how the ECM controls the electric fuel lift pump with a pulse width modulated driver, grounds the lift pump through the ECM, and disables the pump when the circuit fault is detected. It directs technicians to inspect electric fuel lift pump connector pins, ECM connector pins, locking tabs, connector seals, wire insulation, moisture, corrosion, dirt, bent pins, pushed-back pins, and broken connector shells. Later guided steps cover disconnecting the fuel lift pump, reading Fault Code 2265 or Fault Code 2266 with INSITE™, checking for pin-to-pin shorts, checking for pin-to-ground shorts, and using a greater than 100k ohms resistance specification to judge the engine harness. The document also notes cold-weather gelled fuel, lift pump rotor stall or seizure, and priming pump current near 9 amperes as possible causes.
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