This fault code 3225 DTCs document is a troubleshooting manual for the aftertreatment purge air actuator mechanical system. It explains when the ECM sets SPN 3490 FMI 7, what the amber warning lamp means, and how to validate repairs with INSITE™ aftertreatment tests.
Official fault code 3225 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250 and ISX15 CM2250 shown in the extracted procedure; file information lists ISB6.7 CM2250 (2010-12) |
| System/Group | Aftertreatment Purge Air Actuator Circuit / DTCs |
| Publication no. | 4022250 for ISX15 CM2250; 2883445 for ISX11.9 CM2250 |
| Year/Revision | Last modified 11-Jun-2010 and 24-Aug-2010 |
| Pages | 8 |
| 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 – Inspect the aftertreatment purge air actuator.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
The extracted procedure identifies ISX11.9 CM2250 and ISX15 CM2250 engine models and covers the aftertreatment purge air actuator circuit used during active diesel particulate filter regeneration. It refers to associated service procedures for the Aftertreatment Fuel Shutoff Manifold, Aftertreatment Purge Air Actuator, and ECM Calibration Code, including Procedure 011-052, Procedure 011-065, and Procedure 019-032. For manufacturer information, visit Cummins official website.
Who needs this fault code 3225 DTCs manual
This manual is for diesel technicians, fleet maintenance teams, and workshop owners diagnosing an aftertreatment purge air actuator fault that disables active DPF regeneration until the next key cycle. It is most useful when checking active related codes, vehicle air plumbing, shutoff valve manifold air flow, actuator response, and ECM calibration status with INSITE™.
The diagnostic flow starts by checking for active fault codes 1926, 1927, 1928, 3223, or 3224. It then directs the technician through actuator inspection, air supply checks, OEM plumbing leak or blockage inspection, and air flow testing from the aftertreatment fuel shutoff manifold air supply line. The document also states the expected result during the Aftertreatment Shutoff Valve and Injector Override test: air should flow continuously during the 60 second test. If air flow results identify a plugged or damaged shutoff manifold, the repair path points to replacement of that manifold; if the purge air actuator is stuck closed, the repair path points to actuator replacement. Final steps compare the ECM code and revision against calibration revision history, then run the required conditions to clear the fault.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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