This Cummins 3751 SCR manual is a 6-page fault-code troubleshooting document for the aftertreatment SCR catalyst system. It explains how the ECM uses aftertreatment intake and outlet NOx sensor readings to evaluate SCR catalyst conversion efficiency during a controlled diagnostic test. The file is intended for service work on Cummins CM2250 engines using INSITE™ electronic service tool.
Official Cummins 3751 SCR manual document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment SCR catalyst system |
| Publication no. | Not shown; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 3751
- Conditions for Setting the Fault Codes
- 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 2 – Check ECM calibration and clear fault codes.
Applicable truck models
This document applies to Cummins electronic control module diagnostics for ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250 engines. It covers Fault Code 3751, SPN 4792 FMI 7, where the ECM detects lower than expected NOx conversion across the SCR catalyst; the SCR catalyst is described as being in the exhaust system after the diesel particulate filter and decomposition tube. For manufacturer information, visit Cummins official website.
Who needs this Cummins 3751 SCR manual
Workshop technicians need this 3751 SCR manual when checking whether Fault Code 3751 is active, confirming related Fault Codes 3543 or 3582, comparing ECM calibration code and revision information, and clearing the fault after the required Aftertreatment Diesel Particulate Filter Regeneration Test. It is especially relevant when INSITE™ shows the SCR catalyst mechanical system as not responding or out of adjustment.
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