The Detroit SPN 723 FMI 4 fault sheet is a single-page DTC reference that identifies a short to ground condition on the DD Series (EPA 2007-Current) powertrain. It describes the short to ground affecting the camshaft position (CMP) sensor circuit, 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 — Short to Ground circuit |
| Fault code | SPN 723 / FMI 4 |
| Source | TruckFaultCodes.com fault-code reference (© 2017) |
| Year / Revision | Copyright 2017 |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification for SPN 723 under failure mode 4
- Short to Ground description
- Affected circuit, pin and MCM 120-pin connector
- CPC versus MCM shared-SPN distinction note
- Step-by-step troubleshooting procedure
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 723 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 723 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 the code originates in the powertrain controller before following these steps:
- Disconnect the camshaft position (CMP) sensor and the MCM 120-pin connector.
- Measure resistance between pin 1 of the CMP harness and ground; below 1k ohm, repair the wire to pin 82 of the MCM connector.
- Measure resistance between pin 2 and ground; below 1k ohm, repair the wire to pin 45 of the MCM connector, otherwise replace the sensor.
The full 2-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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