SPN 615 FMI 5 is the Detroit DD Series diagnostic fault-code sheet (SPN 615 / FMI 5) that documents an Axial Power Turbine (APT) air seal pressure regulator valve circuit that has failed open. This 1-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 5 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 5 |
| Source | Detroit / DDC diagnostic troubleshooting reference |
| Year / Revision | © 2017 |
| Pages | 1 |
| File size | 0.21 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code definition (SPN 615, FMI 5)
- Engine Serial Number note
- Troubleshooting steps
- Air seal pressure regulator valve voltage check
- Harness connector diagnosis
- Valve replacement decision
Fault definition and diagnosis
A note warns that if the Engine Serial Number is below the listed threshold and the turbocharger was replaced, the Detroit Customer Support Center must be contacted for an MCM application group change. The technician disconnects the turbocharger compound air seal pressure regulator valve, turns the ignition on, and measures the voltage between pins 1 and 2 of the valve harness connector to decide whether to replace the valve or continue testing the wiring.
Applicable truck models
It applies to Detroit DD Series engines (EPA 2007 to current) and Series 60 (DDEC VI, EPA 2007) turbocharged engines fitted with the axial power turbine air seal system. For engine specifications and authorised service information, see the official Detroit engine website.
Who needs the SPN 615 FMI 5 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 5 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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