This Cummins 1143 troubleshooting manual covers Fault Code 1143 for injector solenoid driver cylinder 4 mechanical system response and adjustment diagnostics. It explains the circuit description, ECM fault logic, possible performance effect, INSITE™ checks, connector inspections, rail fuel pressure sensor tests, ECM harness checks, calibration review, and clearing procedure.
Official Cummins 1143 troubleshooting manual document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; associated listings also reference ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, and QSL9 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Injector Solenoid Driver Cylinder 4 – Mechanical System Not Responding or Out of Adjustment |
| Publication no. | 4022254 for ISB6.7 CM2250; associated bulletin numbers shown include 4022257, 4022250, 2883445, and 4022256 |
| Year/Revision | Unknown; last modified dates shown: 11-Jun-2010 and 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
- FAULT CODE 1143
- 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 document is for Cummins CM2250 engine diagnostics, with the file group identifying ISB6.7 CM2250 and the associated procedure table also listing ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, and QSL9 CM2250. The procedure applies to Fault Code 1143, PID S004, SPN 654, FMI 7, where the ECM detects an error with injection timing and may illuminate the amber CHECK ENGINE lamp or MIL after two consecutive failed trips. For manufacturer information, visit Cummins official website.
Who needs this Cummins 1143 troubleshooting manual manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins 1143 troubleshooting manual when diagnosing cylinder 4 injector solenoid driver faults before replacing an injector. It supports checks for related fuel system codes, injector circuit codes 322, 323, 324, 325, 331, and 332, rail fuel pressure sensor circuit response codes 451 and 452, ECM connector condition, engine harness damage, and ECM calibration level.
The workflow directs the technician to turn the keyswitch on or off as required, connect INSITE™ electronic service tool, read active and inactive fault counts, disconnect the rail fuel pressure sensor or ECM connector, inspect connector pins, and use jumper-wire response tests where specified. Repairs referenced in the document include cleaning connector pins, repairing the engine harness under Procedure 019-043, replacing the ECM under Procedure 019-031 after authorization, calibrating the ECM under Procedure 019-032, and validating the repair by idling the engine for 1 minute so Fault Code 1143 becomes inactive.
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