SPN 615 FMI 4 is the Detroit DD Series diagnostic fault-code sheet (SPN 615 / FMI 4) that documents an Axial Power Turbine (APT) air seal pressure regulator valve circuit that has failed high. 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 4 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 4 |
| Source | Detroit / DDC diagnostic troubleshooting reference |
| Year / Revision | © 2017 |
| Pages | 1 |
| File size | 0.13 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code definition (SPN 615, FMI 4)
- Circuit failed-high condition
- Repair action
- Turbocharger valve harness wiring
- MCM 120-pin connector reference
Fault definition and diagnosis
This one-page repair sheet identifies a short to power in the circuit and directs the technician to repair the short between pin 1 of the turbocharger compound air seal pressure regulator valve harness connector and pin 70 of the Motor Control Module (MCM) 120-pin connector. Because the fault is a defined short-to-power condition, the document keeps the corrective action concise rather than listing a long branching test tree.
Applicable truck models
It applies to Detroit DD Series engines (EPA 2007 to current) and Series 60 (DDEC VI, EPA 2007) turbocharged engines using the axial power turbine air seal valve circuit. For engine specifications and authorised service information, see the official Detroit engine website.
Who needs the SPN 615 FMI 4 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 4 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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