The Detroit SPN 712 FMI 3 fault sheet is a single-page DTC reference that identifies a throttle position sensor ground condition on the DD Series (EPA 2007-Current) powertrain. It describes the short to power or open circuit on pin 04 of the CPC4 #1 connector, 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) — GHG14 emissions platform |
| System / Group | DD Series (EPA 2007-Current) / DTCs — Throttle Position Sensor Ground circuit |
| Fault code | SPN 712 / FMI 3 |
| 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 712 under failure mode 3
- Throttle Position Sensor Ground description
- Affected circuit, pin and CPC4 #1 connector
- CPC4 versus MCM2.1 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 712 FMI 3 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 712 FMI 3 fault
The document notes that CPC4 digital outputs share the same SPN as some MCM2.1 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 04 of the CPC4 #1 connector and verify the CPC4 #1 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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