Cummins fault code 3224 is a diagnostic trouble code for the Cummins ISX11.9 CM2250 (2010-12) engine that documents the aftertreatment purge air actuator circuit. This 11-page troubleshooting manual explains what sets the code, the amber warning lamp it activates, and the guided repair steps a technician performs with the Cummins INSITE electronic service tool. It corresponds to SPN 3490 and FMI 3.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | DTCs – Aftertreatment Purge Air Actuator Circuit |
| Reference codes | SPN 3490, FMI 3, Amber lamp |
| Revision | Last modified 11-Jun-2010 |
| Pages | 11 |
| File size | 0.20 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and circuit description
- Fault code information (SPN 3490, FMI 3, Amber lamp)
- 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
- Shop talk and possible causes
- Associated procedures and guided troubleshooting steps
Trucks affected by Cummins fault code 3224
The procedure applies to Cummins ISX11.9 CM2250 (2010-12) engines and the related ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) platforms fitted to Class 8 on-highway trucks. The steps rely on the Cummins INSITE electronic service tool to read the fault code, monitor the aftertreatment purge air actuator circuit, and validate the repair. For engine and emissions specifications, consult the Cummins official website.
Who needs this Cummins fault code 3224 manual
Diesel technicians and fleet workshop owners diagnosing purge air actuator high voltage on ISX11.9 CM2250 engines use this manual to follow the factory-correct sequence instead of guessing at parts. Working from the documented running and setting conditions shortens diagnosis time and helps avoid unnecessary aftertreatment component replacement before the true root cause is confirmed.
Because this document is largely a wiring and connector diagnostic tree, it walks a technician through checking the aftertreatment purge air actuator circuit circuit, harness continuity, connector pins, and supply voltages before any component is replaced.
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