This Cummins 3545 NOx sensor document is a troubleshooting file for Fault Code 3545 on CM2250 aftertreatment systems. It explains the aftertreatment outlet NOx sensor abnormal rate of change fault, the ECM response, clearing conditions, calibration checks, and guided diagnostic steps using INSITE™ electronic service tool.
Official Cummins 3545 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. | 4022254, 4022257, 4022250, 2883445 shown as associated bulletin numbers |
| Year/Revision | Last Modified: 30-Nov-2010 |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- 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.
Applicable truck models
This file covers Cummins CM2250 engine applications listed in the procedure table: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The component location can vary by engine application, but the document states the aftertreatment outlet NOx sensor is usually located in the exhaust system at the outlet of the aftertreatment SCR catalyst. Manufacturer information is available from Cummins official website.
Who needs this Cummins 3545 NOx sensor manual
Workshop owners, diesel mechanics, and diagnostic technicians need this Cummins 3545 NOx sensor manual when an amber CHECK ENGINE lamp or MIL is linked to SPN 3226 FMI 10. It is also useful before replacing the aftertreatment outlet NOx sensor, because the procedure first checks related active fault codes and ECM calibration status.
The diagnostic summary states that Fault Code 3545 is for “Aftertreatment Outlet NOx Sensor – Abnormal Rate of Change.” The code reason is that the aftertreatment outlet NOx sensor circuit has an abnormal rate of change and the sensor reading is not valid. The extract notes no effect on engine performance, but the ECM illuminates the amber CHECK ENGINE lamp and/or malfunction indicator lamp immediately when the diagnostic runs and fails.
The troubleshooting path begins with checking active fault codes using INSITE™ electronic service tool. If Fault Code 1887, 2771, or 3681 is active, the document directs the technician to the appropriate fault code troubleshooting tree before continuing. If Fault Code 3545 is active, the guided step identifies an internal error in the aftertreatment outlet NOx sensor and directs replacement of the aftertreatment outlet NOx sensor under Procedure 019-451.
The later steps cover ECM calibration and fault clearing. The technician compares the ECM code and revision number to the ECM Calibration Revision History for applicable changes, then calibrates the ECM if needed under Procedure 019-032. To validate the repair, the engine must be operated to raise exhaust temperature above 150°C [302°F] at the aftertreatment outlet NOx sensor, either by driving or by stationary regeneration using INSITE™ electronic service tool.
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