This document is a Cummins 1144 troubleshooting PDF for Fault Code 1144, covering injector solenoid driver cylinder 5 diagnostics and repair validation. It explains the fault reason, ECM response, INSITE™ checks, rail fuel pressure sensor circuit tests, harness inspections, ECM calibration review, and fault clearing steps.
Official Cummins 1144 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Injector Solenoid Driver Cylinder 5 Circuit |
| Publication no. | 4022254, 4022257, 4022250, 2883445, 4022256 |
| Year/Revision | Last Modified: 11-Jun-2010; 27-Oct-2010 |
| Pages | 13 |
| File size | 0.2 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 2A – Inspect the rail fuel pressure sensor and connector pins.
- 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 CM2250 engine families listed in the associated procedures: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, and QSL9 CM2250. The extract identifies the fault as Injector Solenoid Driver Cylinder 5 – Mechanical System Not Responding or Out of Adjustment, with SPN 655 and FMI 7, and notes possible reduced engine performance when the amber CHECK ENGINE lamp or MIL is active. See the manufacturer at Cummins official website.
Who needs this Cummins 1144 troubleshooting manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this Cummins 1144 troubleshooting manual when Fault Code 1144 is active or when injector circuit, rail fuel pressure sensor, ECM connector, engine harness, or ECM calibration checks are required. It is also useful before replacing a fuel injector, because the Shop Talk section tells users to check for other fuel system related fault codes first.
The procedure directs users through active fault checks, related injector circuit codes 322, 323, 324, 325, 331, and 332, and fuel pressure related codes 451, 452, 553, and 559. It includes connector inspection points such as loose connectors, corroded pins, bent or broken pins, pushed back pins, moisture, damaged seals, wire insulation damage, and locking tab damage. Later guided steps describe jumper-wire circuit response checks at the rail fuel pressure sensor connector and ECM connector, repair or replacement of the engine harness when an open or short circuit is detected, authorization before ECM replacement, and calibration update review using INSITE™ electronic service tool.
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