SPN 4258 FMI 3 is the Detroit diesel diagnostic trouble code for the Injector Amplifier Control Valve Cylinder 4, 5, 6 Shorted to Battery on DD Series (EPA 2007-Current) engines. This 1 page EPA10 / GHG14 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 4258 FMI 3 means
This code sets when the injector amplifier control valve for cylinders 4, 5 and 6 is shorted to battery, with an enabling condition of fis_nop_act greater than 1.85. It lights the MIL and CEL, applies a 25% derate, and is verified at 1400 to 1500 RPM for one minute.
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 4258 / FMI 3 (EPA10 / GHG14) |
| Monitored parameter | Injector amplifier control valve, cylinders 4, 5 and 6 |
| Enabling condition | fis_nop_act > 1.85 |
| Dash lamps | MIL, CEL |
| Engine reaction | 25% derate |
| Verification | Engine RPM 1400-1500 (1 minute) |
| Pages | 1 page |
| Source | Detroit Power Service Literature |
| Format | PDF, English |
Diagnostic steps in this manual
The single-page procedure isolates the short with a voltage check at the harness connector.
- Disconnect the rear fuel injector harness 14-pin connector and turn the ignition on with the engine off.
- Measure the voltage at pin 1 on the MCM side of the 14-pin connector to ground.
- Voltage present indicates a short to power toward pin 4 of the 120-pin MCM connector.
- Trace and repair the affected wiring between the harness and the 120-pin MCM connector.
All pin references follow the Detroit 120-pin MCM connector layout documented in Power Service Literature. Because SPN 4258 FMI 3 is a factory-defined code, following the exact injector amplifier control valve 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 4258 FMI 3 guide
Heavy-duty technicians and workshop owners diagnosing injector amplifier control valve 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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