Cummins fault code 3543 is the official Cummins troubleshooting document for SPN 4094 FMI 31 — NOx Limits Exceeded Due to Insufficient Reagent Quality – Condition Exists — on the ISX11.9 CM2250 (2010-12) engine platform. This 15-page PDF is taken from the Cummins service manual and covers the circuit description, the conditions that set the code, and the full guided step-by-step repair. It references Cummins troubleshooting procedure 019-032, last revised 31-Dec-2010.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | NOx Limits Exceeded Due to Insufficient Reagent Quality – Condition Exists |
| Diagnostic identifier | SPN 4094 · FMI 31 · Amber lamp |
| Publication reference | Procedure 019-032 |
| Revision | 31-Dec-2010 |
| Pages | 15 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and Circuit Description
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Troubleshooting Steps and Associated Procedures
- Guided repair steps with specifications
What Cummins fault code 3543 means
NOx Limits Exceeded Due to Insufficient Reagent Quality – Condition Exists. The diesel exhaust fluid quality is not sufficient enough to provide adequate NOx reduction. Possible engine power derate. Vehicle speed may also be limited. The manual explains that the ECM monitors the NOx concentration in the engine’s exhaust gases using an aftertreatment intake NOx sensor and aftertreatment outlet NOx sensor. The document lists the exact ECM conditions under which this code is set and cleared, so a technician can confirm the diagnosis with INSITE electronic service tool before replacing parts.
Applicable truck models and engines
This troubleshooting procedure applies to Cummins ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) engines from the 2010-2012 CM2250 electronic control family. The same guided steps are shared across the CM2250 range covered in this bulletin. Full engine and vehicle coverage should always be confirmed against the official Cummins Inc. website for your ECM calibration.
Who needs this Cummins fault code 3543 manual
Heavy-truck diesel technicians and workshop owners diagnosing SPN 4094 on ISX11.9 CM2250 engines need this document to follow the factory procedure instead of guessing. It is part of the wider DiagTechPro manuals library of Cummins troubleshooting manuals.
The complete PDF of this Cummins troubleshooting manual is available in the DiagTechPro manuals library — a free account is required to download.
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