This Cummins 1143 fault code document is a 7-page PDF troubleshooting procedure for an ISB6.7 CM2350 engine DTC. It covers Fault Code 1143, SPN 654, FMI 7, amber lamp behavior, injector cylinder 4 diagnosis, fuel rail pressure checks, and ECM calibration actions.
Official Cummins 1143 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350 (2013-17) |
| System/Group | DTCs; injector solenoid driver cylinder 4; fuel rail pressure checks |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown; copyright 2017 shown |
| Pages | 7 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 1143
- PID: S004
- SPN: 654
- FMI: 7
- LAMP: Amber
- Injector Solenoid Driver Cylinder 4 – Mechanical System Not Responding or Out of Adjustment
- 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. The extract does not identify a specific truck make or chassis, so use it by engine family and ECM platform rather than by vehicle model. The procedure references the ECM, engine harness, rocker housing pass-through connectors, internal injector harnesses, fuel rail pressure sensor, fuel pump actuator, high-pressure fuel supply pump, OEM fuel drain lines, and diagnostic tool commands. For manufacturer engine information, visit Cummins official website.
Who needs this Cummins 1143 fault code manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins 1143 fault code manual when an ISB6.7 CM2350 logs injector solenoid driver cylinder 4 faults, rough operation, engine knock, misfire, or single-cylinder performance complaints. The steps support scan-tool fault reading, cylinder cutout testing, connector inspection, fuel rail pressure comparison, drain flow checks, drain line restriction checks, and ECM calibration review.
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