The SPN 723 FMI 31 document is a Detroit DD Series diagnostic trouble code guide covering the no match of camshaft and crankshaft signals condition and its step-by-step troubleshooting. This 3 pages PDF is compiled from the TruckFaultCodes.com Detroit fault codes reference (© 2017) for the DD Series (EPA 2007-Current) / DTCs set. It is written for workshop diagnostics rather than general reading.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) engines |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Diagnostic trouble code | SPN 723/FMI 31 — No Match of Camshaft and Crankshaft Signals |
| Publication no. | Not stated (TruckFaultCodes.com DTC reference) |
| Year / Revision | © 2017 |
| Pages | 3 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 723 FMI 31 document sections
- Fault code identification: SPN 723/FMI 31 — no match of camshaft and crankshaft signals
- Description, enabling conditions and engine reaction (25% derate, shutdown priority)
- Checking CMP, CKP and oil pressure faults, plus throttle and idle validation faults
- Idle Speed Balance (ISB) test and cranking speed check (over 150 rpm)
- CMP sensor harness voltage checks to the MCM 120-pin connector (pins 45 and 82)
- Camshaft timing verification and camshaft position sensor replacement
Applicable truck models covered
The SPN 723 FMI 31 fault applies to trucks fitted with Detroit DD Series (EPA 2007-Current) engines and the associated engine control modules, covering all model years. The procedure references Camshaft Position sensor, Crankshaft Position sensor, Motor Control Module and fuel injector, and works through working through injector, sensor-harness and camshaft-timing checks to the MCM 120-pin connector. Confirm the engine and emissions configuration against the vehicle build before ordering parts; verify current procedures on the Detroit Diesel official site.
Who needs this SPN 723 FMI 31 manual
This reference suits Detroit-certified technicians and fleet workshop owners diagnosing the no match of camshaft and crankshaft signals condition on DD Series engines. Every troubleshooting step and decision branch from the original PDF is preserved so the on-vehicle diagnosis can be followed in sequence, and the document names the exact connectors, pins and modules involved. Use it alongside a Detroit-compatible scan tool such as DDDL or DDRS.
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