The fault code 325 DTCs troubleshooting manual is the official Cummins diagnostic procedure for the injector solenoid driver cylinder 6 circuit on the ISX11.9 CM2250 engine platform. The injector solenoid valves control fueling quantity and injection timing, and the ECM energizes each solenoid by closing a high-side and a low-side switch over a dedicated circuit. This 33-page PDF walks a technician from symptom to verified repair.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12) |
| System / Group | injector solenoid driver cylinder 6 circuit, DTCs |
| Fault code reference | Fault Code 325 — SPN 656, FMI 5 |
| Warning lamp | an amber warning lamp |
| Revision (Last Modified) | 26-Aug-2010 |
| Pages | 33 |
| File size | 0.38 MB |
| Format | |
| Language | English |
fault code 325 DTCs document contents
- Overview and Circuit Description
- Component Location
- 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 table
- Guided troubleshooting steps
- Verify the repair
Applicable truck models covered
This procedure applies to Cummins engines that report Fault Code 325 (SPN 656, FMI 5), including the Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12). Always confirm the exact calibration and publication for your engine on the official Cummins engine support site before ordering parts.
Common causes and symptoms
This fault is logged when the cylinder 6 injector driver current is below normal or the circuit is open, and that cylinder may misfire or drop out. Shop Talk in the document lists the most likely causes:
- Open or shorted injector wiring in the engine harness
- A short circuit inside the cylinder 6 injector
- A malfunctioning or damaged ECM
Who needs the fault code 325 DTCs manual
Diesel technicians and workshop owners diagnosing Fault Code 325 on ISX11.9 CM2250 trucks need this manual to follow the guided steps, use the correct connector pins and verify the repair with INSITE electronic service tool instead of guessing.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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