SPN 703 FMI 3 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 Digital Output 3-09 circuit and reports a short to power or open circuit on pin 9 of the CPC4 #3 connector. It is published for use with the diesel diagnostic tool and cites TruckFaultCodes.com, Copyright 2017, as its source.
SPN 703 FMI 3 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 703 with FMI 3 (Digital Output 3-09) |
| Fault condition | Short to power or open circuit on pin 9 of the CPC4 #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 Digital Output 3-09 circuit showing a short to power or open circuit on pin 9 of the CPC4 #3 connector. It carries the standard advisory that the Common Powertrain Controller (CPC4) digital outputs share the same SPN as some Motor Control Module (MCM2.1) faults, and that the diesel diagnostic tool separates the MCM2.1 from the CPC4 when diagnosing. For wiring detail it refers the technician to Original Equipment Manufacturer (OEM) literature.
Troubleshooting steps included
The page also includes a numbered troubleshooting sequence: turn the ignition on, connect the diesel diagnostic tool, confirm the PGR035 digital-output parameters, then repair the fault on the affected pin per 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 CPC4 and MCM2.1 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 703 FMI 3 manual
Fleet technicians, mobile diesel mechanics and workshop owners diagnosing a lit dashboard warning or a logged Digital Output 3-09 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 CPC4 or MCM2.1 raised the fault.
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