Cummins ISM Code 379 is the official Cummins fault code troubleshooting PDF that documents the actuator circuit on ISM CM570 (1999-02) engines. This 5-page reference from the Cummins service literature explains the circuit, the likely causes behind the yellow warning lamp, and the step-by-step checks a technician follows to confirm the repair.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISM CM570, ISX CM570 and Signature CM570 (1999-02) |
| System / Group | Actuator Circuit (DTCs) |
| Fault code | Code 379 · PID S018 · SPN 633 · FMI 6/6 |
| Warning lamp | Yellow |
| Year / Revision | Copyright 2017 |
| Pages | 5 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit description
- Component location
- Shop talk – possible causes
- Troubleshooting steps
- Fault code verification and clearing
Cummins ISM Code 379 troubleshooting summary
The fuel actuators are actuated by the electronic control module (ECM) to control fuel metering. Each fuel actuator is connected to the ECM by a supply and a return wire. The front fueling actuator is mounted on the fuel delivery housing. The manual walks through 6 labelled troubleshooting steps that inspect connectors and pins, measure circuit resistance, and verify the fault code is inactive after the repair.
The possible failure modes are short circuit to battery, low actuator
resistance, or short circuit between supply and return wires. — 1 of 5 —
www.TruckFaultCodes.com
Copyright 2017
2
Referenced Cummins service tools and part numbers: 3824510.
Applicable truck models
This procedure applies to Cummins ISM CM570, ISX CM570 and Signature CM570 engines built in the 1999-02 range, as used in Class 8 highway trucks. Always confirm the exact engine dataplate before servicing. Full engine specifications and dealer support are available on the Cummins official website.
Who needs this Cummins ISM Code 379 manual
Heavy-duty diesel technicians, fleet service managers and independent workshop owners diagnosing a Code 379 on the actuator circuit rely on this document to follow the manufacturer procedure instead of guessing at parts. Because Code 379 shares its troubleshooting logic with the ISX CM570 and Signature CM570 platforms, a single PDF supports several Cummins engine families in the same workshop.
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