This 12-page troubleshooting guide covers Fault Code 3579 DTCs, which indicates an open circuit or current-below-normal condition in the aftertreatment diesel exhaust fluid (DEF) return valve. The document provides circuit descriptions, diagnostic conditions, step-by-step fault isolation procedures, and repair instructions for engines equipped with the CM2250 ECM platform.
Official Fault Code 3579 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, ISF2.8 CM2220, ISF3.8 CM2220, GX CM2250 |
| System/Group | Aftertreatment Diesel Exhaust Fluid Dosing Unit Circuit — DTCs |
| SPN / FMI | SPN 4376 / FMI 5 |
| Year/Revision | Last Modified 14-Dec-2010 |
| Pages | 12 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code (SPN 4376, FMI 5)
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk — Purge Warnings and Cold Weather Precautions
- Associated Procedures Table (011-057, 011-058, 019-032, 019-071)
- Step 1 — Check the Fault Codes (Inactive Fault Code Check)
- Step 2 — Check the Aftertreatment DEF Return Valve and Circuit (Pin Inspection, Circuit Response, Jumper Wire Test)
- Step 3 — Check the Aftertreatment DEF Controller and Harness (86-Pin Connector Inspection, Open Circuit Resistance Measurement)
- Step 4 — ECM Calibration Verification and Fault Code Clearing
Applicable truck models
This procedure applies to all Cummins engines using the CM2250 controller platform, including the ISB6.7, ISC8.3, ISL9, ISX11.9, ISX15, and GX CM2250, as well as ISF2.8 and ISF3.8 CM2220 variants. These engines are found in medium- and heavy-duty trucks from multiple OEMs operating SCR-based aftertreatment systems. The diagnostic requires INSITE™ electronic service tool for fault code reading, circuit response testing, and calibration verification. Resistance checks reference a threshold of 100k ohms for detecting open circuits in the DEF controller harness. When the fault is active, the amber CHECK ENGINE lamp illuminates, the SCR system cannot purge, and engine torque may be reduced over extended operation. For official engine support resources, visit Cummins official website.
Who needs this Fault Code 3579 DTCs manual
Diesel technicians and workshop owners diagnosing an amber CHECK ENGINE lamp caused by a DEF return valve open circuit on CM2250-equipped engines need this document. It walks through connector inspection, jumper wire verification, harness continuity testing, and controller replacement decisions in a structured yes/no guided format.
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