This Cummins NOx sensor fault document is a 6-page troubleshooting PDF for Fault Code 1887 on CM2250 engines. It explains the aftertreatment outlet NOx sensor circuit, active fault conditions, ECM lamp actions, torque derate effects, clearing requirements, and guided INSITE™ diagnostic steps.
Official Cummins NOx sensor fault 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 Outlet NOx Sensor Circuit |
| Publication no. | Bulletin numbers shown: 4022254, 4022257, 4022250, 2883445 |
| Year/Revision | Last Modified: 21-Dec-2010; troubleshooting steps Last Modified: 11-Jun-2010 |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 1887 – Aftertreatment Outlet NOx Sensor Circuit – Voltage Below Normal or Shorted to Low Source
- 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 NOx sensor fault guide applies to Cummins CM2250 engine platforms listed in the extract: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The component is the aftertreatment outlet NOx sensor, usually located in the exhaust system at the outlet of the aftertreatment SCR catalyst, with exact location varying by engine application. For manufacturer information, visit Cummins official website.
Who needs this NOx sensor fault manual
This manual is for technicians diagnosing SPN 3226 FMI 4, PID P2202, and Fault Code 1887 with INSITE™ electronic service tool. It is useful when confirming active codes, checking ECM calibration revision, replacing the aftertreatment outlet NOx sensor under Procedure 019-451, or clearing the code after exhaust temperature reaches the required diagnostic range.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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