SPN 164 FMI 15 is the Detroit DD Series diagnostic trouble code for rail pressure deviation greater than 200 bar while under load, and this page documents its official high-pressure fuel system troubleshooting sheet. This seven-page sheet is the most detailed rail-pressure diagnostic in the set, listing possible causes from external fuel leakage and pressure-limiting-valve leakage to fuel contamination, aeration and high-pressure pump failure, and it calls out service tools J-48876, J-48704 and J-48706 with DDDL 7.06 sp2 or higher.
SPN 164 FMI 15 document details
| Brand | Detroit |
| Model coverage | DD Series — DD13, DD15, DD16 |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| SPN | 164 |
| FMI | 15 |
| Fault | Rail Pressure Deviation Greater Than 200 Bar While Under Load |
| Emissions / revision | GHG14 — Copyright 2017 |
| Pages | 7 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Description, causes and service tools (J-48876, J-48704, J-48706)
- Fuel level, contamination and external leak checks
- Pressure Limiting Valve (PLV) open-count review
- Automatic Fuel System Integrity Check (FSIC)
- Bleed-off, idle-speed-balance and aerated-fuel tests
- PLV flow test and low-pressure leak test
Troubleshooting steps summarised
The technician records fuel level and inspects for contamination and external leaks, then uses the diesel diagnostic tool to read pressure-limiting-valve open counts and run the Automatic Fuel System Integrity Check (FSIC). The log file is reviewed for rail-pressure bleed-off time, fuel-compensation pressure, idle-speed-balance values and aerated-fuel symptoms, leading to a PLV flow test, low-pressure leak test and injector-cap crank test. If the fault is still unresolved after the wiring is confirmed, the sheet directs the technician to contact the Detroit Customer Support Center at 800-445-1980.
Applicable truck models covered
It covers Detroit DD Series engines (DD13, DD15 and DD16) with GHG14 hardware and the three-filter high-pressure fuel system. For engine specifications and warranty coverage, refer to the official Demand Detroit service resources. These troubleshooting steps are cross-checked with the Detroit Diesel Diagnostic Link (DDDL) and the official Demand Detroit service resources.
Who needs this SPN 164 FMI 15 guide
Technicians investigating a check-engine lamp with a large rail-pressure deviation under load, aerated fuel, or a leaking pressure-limiting valve use this in-depth sheet before replacing high-pressure components.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download the complete step-by-step document.
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