This 11-page Cummins ISB6.7 3578 3578 troubleshooting document provides complete diagnostic and repair procedures for the aftertreatment diesel exhaust fluid (DEF) return valve circuit when voltage below normal or shorted to low source is detected. It covers SPN 4376, FMI 4 and applies to CM2250 engine control modules across multiple Cummins engine platforms.
Official Cummins ISB6.7 3578 3578 document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, ISF2.8 CM2220, ISF3.8 CM2220, GX CM2250 |
| System/Group | Aftertreatment Diesel Exhaust Fluid Dosing Unit Circuit — DTCs |
| Publication no. | Bulletin 4022254 (ISB6.7 CM2250) |
| Year/Revision | Last modified 14-Dec-2010 |
| Pages | 11 |
| 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 Fault Code 3578 (SPN 4376, FMI 4)
- 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 (Procedures 011-057, 011-058, 019-032)
- Step 1 — Check the Fault Codes (Step 1A: Check for Inactive Fault Code)
- Step 2 — Check the Aftertreatment DEF Return Valve and Circuit (Steps 2A, 2B, 2C)
- Step 3 — Check the Aftertreatment DEF Controller and Harness (Steps 3A, 3B)
- Step 4 — Check ECM Calibration and Clear Fault Codes (Steps 4A, 4B)
Applicable truck models
This document applies to vehicles equipped with Cummins ISB6.7 CM2250 engines produced in the 2010–2012 range, as well as ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, and GX CM2250 platforms sharing the same aftertreatment DEF dosing unit circuit design. When fault code 3578 is active, the amber CHECK ENGINE lamp illuminates, DEF injection is disabled, and engine torque may be reduced during extended operation. The guided troubleshooting steps require INSITE™ electronic service tool to read fault codes, check circuit response, and verify ECM calibration revision levels. For official engine support and service locator, visit Cummins official website.
Who needs this Cummins ISB6.7 3578 3578 manual
Diesel mechanics and workshop owners diagnosing DEF return valve low-voltage faults on CM2250-equipped trucks need this guide. It delivers structured, decision-tree troubleshooting from connector inspection through harness short-circuit isolation to ECM calibration verification and component replacement references.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
Related manuals library
Related library topics: Cummins ISB6.7 fault code; amber CHECK ENGINE lamp; Cummins; aftertreatment diesel exhaust fluid return valve; CM2250 DEF dosing unit; SPN 4376 FMI 4.
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