The Detroit SPN 710 FMI 4 fault sheet is a single-page DTC reference that identifies a wait to start lamp condition on the DD Series (EPA 2007-Current) powertrain. It describes the short to power or open circuit on pin 6 of the CPC #4 connector, reported as Digital Output 4 06 failed low, names the controller connector involved, and explains how the diesel diagnostic tool tells powertrain-controller outputs apart from engine-controller faults that carry the same code.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | DD Series (EPA 2007-Current) — all model years |
| System / Group | DD Series (EPA 2007-Current) / DTCs — Wait to Start Lamp (WTS) circuit |
| Fault code | SPN 710 / FMI 4 |
| Source | TruckFaultCodes.com fault-code reference (© 2017) |
| Year / Revision | Copyright 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification for SPN 710 under failure mode 4
- Wait to Start Lamp (WTS) description
- Affected circuit, pin and CPC #4 connector
- CPC versus MCM shared-SPN distinction note
- OEM wiring schematic reference
Applicable truck models and engines
This reference applies to Detroit DD Series (EPA 2007-Current) engine platforms fitted with the Common Powertrain Controller, and the code is catalogued for both current DD Series and Series 60 (DDEC VI, EPA 2007) installations. Because harness routing varies by chassis, always confirm pin assignments against the Original Equipment Manufacturer (OEM) schematic before testing. For engine and emissions-system references, see Detroit’s official powertrain resources.
Who needs this SPN 710 FMI 4 manual
This sheet is written for heavy-duty truck technicians and independent workshop owners who pull the code on a Detroit-powered unit and want a fast, accurate description of the failing circuit before they open the wiring harness or condemn a part.
Troubleshooting the SPN 710 FMI 4 fault
The document notes that CPC digital outputs share the same SPN as some MCM faults, so use the diesel diagnostic tool to confirm whether the code originates in the powertrain controller or the engine controller. Once confirmed, repair the short to power or open circuit on pin 6 of the CPC #4 connector, reported as Digital Output 4 06 failed low and verify the CPC #4 connector terminals, referring to the OEM wiring schematic for pin routing and expected values.
The full 1-page PDF, with its wiring notes and repair guidance, is available in the DiagTechPro manuals library; a free account is required to download.
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