SPN 615 FMI 14 is the Detroit DD Series diagnostic fault-code sheet (SPN 615 / FMI 14) that documents internal or external leakage of the high pressure fuel system detected by the MCM. This 2-page PDF, drawn from the Detroit / Detroit Diesel Corporation (DDC) troubleshooting reference (© 2017), gives the workshop the exact measured checks needed to confirm and repair the fault rather than guess at it.
SPN 615 FMI 14 document details
| Brand | Detroit (Detroit Diesel Corporation) |
| Model coverage | DD Series (EPA 2007-Current); Series 60 (DDEC VI, EPA 2007) |
| System / Group | Diagnostic Trouble Codes (DTCs) – SPN 615 / FMI 14 |
| Source | Detroit / DDC diagnostic troubleshooting reference |
| Year / Revision | © 2017 |
| Pages | 2 |
| File size | 0.22 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code definition (SPN 615, FMI 14)
- Description and monitoring logic
- Possible leakage sources
- Troubleshooting steps
- High pressure fuel component inspection
- Related fault codes
Fault definition and diagnosis
The Motor Control Module monitors rail pressure and sets the code when the leakage rate exceeds the documented limit; there is no limp-home fault reaction associated with this code. The document lists the possible causes as external fuel leakage between the high pressure pump and the fuel injectors, worn high pressure pump pumping elements, fuel injector amplifier or needle leakage, and internal pressure limiting valve leakage, and directs the technician to service any additional codes first and inspect the fuel system components.
Applicable truck models
It applies to Detroit DD Series engines (EPA 2007 to current) and Series 60 (DDEC VI, EPA 2007) engines using the common-rail high pressure fuel system. For engine specifications and authorised service information, see the official Detroit engine website.
Who needs the SPN 615 FMI 14 manual
Diesel technicians and workshop owners diagnosing this Detroit DTC with DiagnosticLink or ServiceLink use it to follow the manufacturer sequence step by step, and to confirm the SPN 615 / FMI 14 repair before returning the truck to service.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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