This Cummins 2771 NOx sensor document is a 20-page troubleshooting PDF for Fault Code 2771, Aftertreatment Outlet NOx Sensor – Abnormal Update Rate. It explains the circuit, fault conditions, effects, clearing conditions, and guided diagnostic checks for the aftertreatment outlet NOx sensor and J1939 data link.
Official Cummins 2771 NOx sensor 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. | Not shown in extract |
| Year/Revision | Last Modified: 21-Dec-2010; troubleshooting revision shown as 21-Oct-2010 |
| Pages | 20 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 2771 – Aftertreatment Outlet NOx Sensor – Abnormal Update Rate
- 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 outlet NOx sensor circuit.
- Guided Step 3. Check the OEM harness.
- Guided Step 4. Check the J1939 data link.
- Guided Step 5. Clear the fault codes.
Applicable truck models
This file applies to Cummins CM2250 engine families named in the extract: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The fault concerns the aftertreatment outlet NOx sensor, usually located in the exhaust system at the outlet of the aftertreatment SCR catalyst, and the document lists bulletin numbers 4022254, 4022257, 4022250, and 2883445 in associated procedure references. For manufacturer information, visit Cummins official website.
Who needs this Cummins 2771 NOx sensor manual
Workshop owners, diesel technicians, and fleet mechanics need this 2771 NOx sensor manual when an amber CHECK ENGINE light or MIL is linked to SPN 3226 FMI 9 and loss of communication with the outlet NOx sensor. The procedure supports checks for power supply voltage within 1-VDC of battery voltage, battery return circuits, connector damage, OEM harness faults, J1939 shorts or opens, terminating resistance, and ECM calibration status.
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