SPN 4077 FMI 14 is the Detroit diesel fault code documented in this hydrocarbon doser fuel line pressure failed self-test troubleshooting guide for DD Series (EPA 2007-Current) engines. This 2-page PDF explains the monitored condition, the enabling parameters and the step-by-step checks a technician follows to confirm and repair the code. It is part of the Detroit DD Series diagnostic trouble code (DTC) library and follows the standard monitored-parameter, enabling-conditions and troubleshooting-step layout used across the Detroit fault-code set.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD Series (EPA 2007-Current); cross-referenced for Series 60 (DDEC VI – EPA 2007) |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | FMI 14 under SPN 4077 — Hydrocarbon Doser Fuel Line Pressure Failed Self-Test |
| Emissions level | All years |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 4077 FMI 14 troubleshooting steps
- The monitored parameter is hydrocarbon (HC) doser fuel line pressure, enabled during dosing, with a 10% derate and verification by parked regeneration.
- Shut off the engine, apply the parking brake, chock the wheels and complete the applicable safety steps; note that a small single fuel tank with extended PTO operation can trigger this code.
- Connect the diesel diagnostic tool, turn the ignition on and repair any fuel-system faults first.
- Visually inspect the HC doser block assembly, dosing fuel line and fuel doser injector valve for external leaks; any trace of fuel is a leak indication.
- Replace the hydrocarbon doser fuel injector valve and clean the flanged manifold/S-pipe cavity if required, then perform a parked regeneration to confirm the repair.
Applicable truck models and engines
This document applies to Detroit DD Series (EPA 2007-Current) engines and covers the hydrocarbon doser fuel line pressure self-test during dosing. The procedure is published in Detroit Power Service Literature and drawn from the Detroit diesel fault-code set; always confirm the latest revision through the official Detroit engine support site.
Who needs this SPN 4077 FMI 14 manual
Fleet technicians and workshop owners use this guide to diagnose a doser fuel-pressure self-test failure and confirm the repair with a parked regeneration. Reading the full procedure before touching the harness keeps the diagnosis on the documented path and avoids replacing good parts.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download.
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