This Cummins 3682 NOx sensor document is a fault-code troubleshooting procedure for the aftertreatment intake NOx sensor power supply circuit. It covers Fault Code 3682, SPN 3218 FMI 2, where the sensor reports erratic, intermittent, or incorrect power supply data to the ECM over the J1939 data link. The procedure is written for service work using INSITE™ electronic service tool and standard harness voltage checks.
Official Cummins 3682 NOx sensor document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; extract also lists ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, and GX CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Intake NOx Sensor Power Supply |
| Publication no. | Not shown for this file; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Last Modified: 27-Dec-2010; overview last modified 11-Jun-2010 |
| Pages | 13 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 3682
- 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 the aftertreatment intake NOx sensor circuit.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file is identified for Cummins ISB6.7 CM2250 engines in the DTC group, and the extracted associated-procedure table also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, and GX CM2250 applications. The covered system is the aftertreatment intake NOx sensor mounted near the turbocharger turbine outlet, with diagnostics for sensor supply voltage, connector condition, OEM harness power and return circuits, battery connections, ECM calibration code, and correct 12 volt or 24 volt sensor selection. For manufacturer information, visit Cummins official website.
Who needs this Cummins 3682 NOx sensor manual
This manual is useful for diesel technicians, fleet maintenance shops, and workshop owners diagnosing an amber CHECK ENGINE lamp or MIL caused by Fault Code 3682. It helps confirm whether the repair path points to connector damage, incorrect Electrical System Voltage settings in INSITE™, an open circuit in the OEM harness, ECM calibration, or replacement of the aftertreatment intake NOx sensor.
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