SPN 709 FMI 4 is the Detroit fault code documented in this single-page reference for the DD Series (EPA 2007-Current) engines. The sheet identifies the code as the Red Stop Lamp circuit and reports a short to ground on pin 16 of the CPC #3 connector. It is published for use with the diesel diagnostic tool and cites TruckFaultCodes.com, Copyright 2017, as its source.
SPN 709 FMI 4 document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-Current); shared with Series 60 (DDEC VI – EPA 2007) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 709 with FMI 4 (Red Stop Lamp) |
| Fault condition | Short to ground on pin 16 of the CPC #3 connector |
| Source | TruckFaultCodes.com, Copyright 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
What this fault code covers
The reference confirms the code as the Red Stop Lamp circuit showing a short to ground on pin 16 of the CPC #3 connector. It carries the standard advisory that the Common Powertrain Controller (CPC) digital outputs share the same SPN as some Motor Control Module (MCM) faults, and that the diesel diagnostic tool separates the MCM from the CPC when diagnosing. For wiring detail it refers the technician to Original Equipment Manufacturer (OEM) literature.
Applicable Detroit truck models
This page applies to Detroit DD Series (EPA 2007-Current) engines, and, where the fault is shared across platforms, Series 60 (DDEC VI – EPA 2007) engines. The same pin and connector references hold across engines built around the CPC and MCM architecture. Confirm the wiring layout against the manufacturer’s own documentation before opening the harness; official engine information is published by Detroit (Demand Detroit).
Who needs this SPN 709 FMI 4 manual
Fleet technicians, mobile diesel mechanics and workshop owners diagnosing a lit dashboard warning or a logged Red Stop Lamp code on a Detroit engine will use this sheet to confirm the circuit, pin and connector before touching the wiring, and to decide whether the CPC or MCM raised the fault.
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