This Cummins 3726 troubleshooting document is a 7-page PDF for Fault Code 3726 on CM2250 engines. It explains the aftertreatment intake NOx sensor circuit, code setting logic, INSITE™ checks, ECM calibration review, and fault clearing procedure.
Official Cummins 3726 troubleshooting 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 intake NOx circuit |
| Publication no. | Not stated in the extract; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 7 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 3726 – Aftertreatment Intake NOx – Data Valid But Above Normal Operating Range – Moderately Severe Level
- 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
- 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 file applies to Cummins CM2250 engine platforms listed in the procedure: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The fault is for SPN 3216 FMI 16, where the ECM detects engine out NOx levels higher than expected from the aftertreatment intake NOx sensor mounted near the turbocharger turbine outlet. For manufacturer information, visit Cummins official website.
Who needs this Cummins 3726 troubleshooting manual
Workshop owners, diesel technicians, and fleet mechanics need this file when an amber CHECK ENGINE lamp or MIL is linked to Fault Code 3726. It supports fault-code triage, DEF dosing system cross-checks, aftertreatment intake NOx sensor related code checks, ECM code and revision review, and repair validation with INSITE™ electronic service tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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