This Cummins 3748 NOx sensor document is a 6-page troubleshooting PDF for Fault Code 3748, covering aftertreatment intake NOx sensor data not rational and drifted high diagnostics. It explains circuit operation, fault conditions, lamp behavior, clearing criteria, INSITE™ checks, ECM calibration review, and replacement direction for the intake NOx sensor.
Official Cummins 3748 NOx sensor document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also lists ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Intake NOx Sensor |
| Publication no. | Bulletin numbers referenced: 4022254, 4022257, 4022250, 2883445 |
| Year/Revision | Last Modified: 25-Aug-2010 |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 3748
- 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.
- Guided Step 2B – Disable the fault code.
Applicable truck models
This file applies to Cummins ISB6.7 CM2250 engines and references the same Fault Code 3748 procedure group for ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250 engines. The document describes an aftertreatment intake NOx sensor mounted on the engine near the turbocharger turbine outlet, used to measure engine-out NOx emissions. The NOx sensor and NOx control module are described as a single serviced component, not individually replaceable. See official engine and service information at Cummins.
Who needs this Cummins 3748 NOx sensor manual
Workshop technicians need this manual when Fault Code 3748 is active with SPN 3216 FMI 20 and an amber CHECK ENGINE lamp or MIL after the diagnostic fails on two consecutive trips. It is useful for checking active fault codes with INSITE™ electronic service tool, verifying whether Fault Codes 1885, 3232, 3649, or 3682 are active, reviewing ECM Calibration Code Procedure 019-032, and deciding whether to inspect installation or replace the aftertreatment intake NOx sensor under Procedure 019-463.
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