This Cummins NOx sensor document is a 2-page diagnostic reference for Fault Code 1887 on CM2250 aftertreatment systems. It explains the aftertreatment outlet NOx sensor circuit, the fault reason, operating effects, diagnostic run conditions, clearing conditions, and likely causes listed in the Cummins text.
Official Cummins NOx sensor document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Outlet NOx Sensor Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 21-Dec-2010 |
| Pages | 2 |
| File size | 0.1 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
- Code reason and effect
- 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
- Refer to Troubleshooting Fault Code 1887
Applicable truck models
This file applies to Cummins CM2250 engine applications named in the extract: ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250. The component location can vary by engine application, but the document states that the aftertreatment outlet NOx sensor is usually located in the exhaust system at the outlet of the aftertreatment SCR catalyst. For official manufacturer information, visit Cummins official website.
Who needs this Cummins NOx sensor manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing Fault Code 1887, SPN 3226 FMI 4, with an amber CHECK ENGINE lamp or MIL. It is most useful when confirming the circuit description, sensor location, diagnostic enable conditions, derate effects, and repair validation steps before replacing the aftertreatment outlet NOx sensor assembly.
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