SPN 4259 FMI 4 is the Detroit diesel diagnostic trouble code for the Fuel Injector 4, 5 or 6 Amplifier Control Valve Circuit Short to Ground on DD Series (EPA 2007-Current) engines. This 4 pages ALL YEARS PDF documents the code description, monitored parameters, dash-lamp and engine-reaction data, and the diagnostic routine drawn from Detroit Power Service Literature.
What SPN 4259 FMI 4 means
This code identifies a short to ground on the amplifier control valve circuit for rear fuel injectors 4, 5 or 6. Diagnosis combines software verification, resistance checks and injector replacement.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | DD Series (EPA 2007-Current), also cross-referenced on Series 60 (DDEC VI, EPA 2007) |
| System / group | Diagnostic trouble codes (DTCs) |
| Fault code | SPN 4259 / FMI 4 (ALL YEARS) |
| Monitored parameter | Injector amplifier control valve, cylinders 4, 5 and 6 |
| Pages | 4 pages |
| Source | Detroit Power Service Literature |
| Format | PDF, English |
Diagnostic steps in this manual
The four-page flow works from software level down to the individual injector.
- Confirm the Motor Control Module (MCM) software is V13.x or higher, reprogramming it if needed.
- Inspect the rear fuel injector harness 14-pin connector for bent pins and water or oil intrusion.
- Measure resistance (greater than 3 ohms) at pin 5 for injectors 4, 5 and 6, using tool J-48671-10.
- Replace the affected injector per the Three-Filter System procedure, or trace shorts to the 120-pin MCM connector.
Injector removal follows the Removal of the Fuel Injector – Three-Filter System procedure, and a failed MCM is replaced only after all harness shorts are cleared. Because SPN 4259 FMI 4 is a factory-defined code, following the exact fuel injector amplifier control valve circuit sequence and the Detroit Power Service Literature references is what keeps the repair verifiable.
Applicable trucks and engines
This procedure applies to Detroit DD Series diesel engines built to EPA 2007 and later standards, and Detroit cross-references the same code on Series 60 (DDEC VI, EPA 2007) engines. Confirm exact coverage on the Detroit Diesel official website.
Who needs this SPN 4259 FMI 4 guide
Heavy-duty technicians and workshop owners diagnosing rear fuel injector harness problems use this guide to follow the factory troubleshooting steps instead of guessing. The full PDF is available in the DiagTechPro manuals library, with a free account required to download.
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