SPN 723 FMI 8 is the Detroit DD Series diagnostic sheet that explains camshaft position sensor time out on DD Series engines of all model years. This fault reports a camshaft position (CMP) sensor time out, monitored at engine idle with a typical ten-second duration, MIL and CEL dash lamps and a 25% engine derate. The sheet first confirms cranking speed is over 150 rpm, then inspects the CMP sensor and harness for damage and measures voltage between pins 1 and 3. Later steps disconnect the Motor Control Module (MCM) 120-pin connector and measure harness resistance to isolate a shorted or open wire. This DiagTechPro library page outlines what the 4 pages PDF contains before you download it.
SPN 723 FMI 8 document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007–Current) |
| System / group | Camshaft position (CMP) sensor |
| Fault code (SPN / FMI) | 723 / 8 |
| Fault type | Camshaft position sensor time out |
| Emissions platform | all model years |
| Source | TruckFaultCodes.com (Copyright © 2017) |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN and FMI reference)
- Monitored parameter, enabling conditions and dash lamps
- Step-by-step troubleshooting procedure
- Connector, pin, voltage and resistance checks
- Sensor repair or replacement instructions
Applicable truck models and engines
This fault sheet applies to Detroit DD Series engines built to the all model years emissions platform. It is used with the Detroit diesel diagnostic tool, and with ServiceLink where module configuration must be confirmed. Detroit publishes these fault codes through TruckFaultCodes.com, and the same SPN can appear on more than one module, so confirm the reading before ordering parts. For engine coverage and official service literature, see the Detroit official support site.
Who needs the SPN 723 FMI 8 sheet
Fleet technicians and Detroit-certified workshops troubleshooting this Camshaft position (CMP) sensor fault need this sheet to follow the correct checks instead of guessing at parts. It closes with gear train, camshaft and flywheel timing checks and a tone-wheel inspection, so it fits technicians working a derate down to the root cause.
The complete 4 pages PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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