This 8-page PDF is a Fault Code 3679 DTCs troubleshooting guide covering the aftertreatment diesel exhaust fluid (DEF) dosing unit initialization failure on CM2250-controlled engines. It provides circuit descriptions, fault conditions, guided diagnostic steps, and repair procedures for resolving SPN 3361 / FMI 11.
Official Fault Code 3679 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 / DTCs |
| Publication no. | Not specified (references bulletin numbers 4022254, 4022257, 4022250, 2883445, 4022178, 4021704) |
| Year / Revision | Last modified 27-Dec-2010 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Fault Code 3679 — Aftertreatment Diesel Exhaust Fluid Dosing Unit — Root Cause Not Known (SPN 3361 / FMI 11)
- 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 — Possible Causes
- Associated Procedures Table (Procedure 011-058, Procedure 019-032)
- Guided Step 1 — Check the Fault Codes (Step 1A: Check for Inactive Fault Code)
- Guided Step 2 — Check the Aftertreatment DEF Dosing Unit and Circuit (Step 2A: Inspect Connections; Step 2B: Check for Fault Codes 3558, 3559, or 3561)
- Guided Step 3 — Check ECM Calibration and Clear Fault Codes (Step 3A: Calibration Update; Step 3B: Disable the Fault Code)
Applicable truck models
This document applies to Cummins engines equipped with CM2250 and CM2220 electronic control modules using SCR aftertreatment: ISB6.7 CM2250 (2010–2012), ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, GX CM2250, ISF2.8 CM2220, and ISF3.8 CM2220. The DEF dosing unit location is OEM dependent, so it covers multiple truck and equipment manufacturers using these powertrains. For OEM-specific service information, visit Cummins official website.
Who needs this Fault Code 3679 DTCs manual
Diesel technicians and workshop owners diagnosing an amber CHECK ENGINE lamp triggered by Fault Code 3679 on CM2250 engines need this guide. It walks through harness inspection, related fault codes 3558/3559/3561, ECM calibration verification, and dosing unit replacement decisions using INSITE™ electronic service tool.
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