This document is a Cummins 1144 troubleshooting DTCs manual for Fault Code 1144 on ISB6.7 CM2350 engines. It explains the injector solenoid driver cylinder 5 fault, the amber lamp action, diagnostic conditions, clearing requirements, and step-by-step checks for injector, fuel rail pressure, harness, pump, drain line, and ECM calibration issues.
Official Cummins 1144 troubleshooting DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350 (2013-17) |
| System/Group | DTCs; Injector Solenoid Driver Cylinder 5 – Mechanical System Not Responding or Out of Adjustment |
| Year/Revision | Unknown; copyright 2017 in source extract |
| Pages | 7 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 1144; PID: S005; SPN: 655; FMI: 7; LAMP: Amber
- Circuit Description
- Component Location
- Reason
- Effect
- 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
- Troubleshooting Steps
- Step 1A) Check for active fault codes
- Step 1B) Check for injector circuit fault codes
- Step 2B) Perform a single cylinder cutout diagnostic test
- Step 3B) Inspect the fuel rail pressure sensor and connector pins
- Step 3C) Check the fuel rail pressure sensor circuit
- Step 4A) Monitor Commanded Fuel Rail Pressure and Measured Fuel Rail Pressure
- Step 4B) Measure the high-pressure fuel pump fuel drain flow
- Step 4C) Check the fuel drain line restriction
- Step 5A) Check if an ECM calibration update is available
- Step 5B) Disable the fault code
Applicable truck models
This file applies to Cummins ISB6.7 CM2350 engines in the 2013-17 coverage group shown in the document metadata. The extract does not name specific truck makes or chassis models, so application should be verified by engine family, ECM calibration, and active Fault Code 1144 data before repair work. For manufacturer information, visit Cummins official website.
Who needs this Cummins 1144 troubleshooting DTCs manual
Mechanics, fleet technicians, and workshop owners need this 1144 troubleshooting DTCs file when an ISB6.7 CM2350 logs SPN 655 FMI 7 with possible reduced engine performance, rough operation, knock, misfire, or a suspected single-cylinder fuel delivery issue. The procedure supports fault-code reading, injector circuit fault screening, cylinder cutout testing, fuel rail pressure sensor inspection, wiggle testing from the ECM to the rail sensor, fuel pump actuator decisions, high-pressure fuel pump drain flow checks, drain line restriction checks, and ECM calibration review.
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