SPN 677 FMI 14 is the Detroit DD Series diagnostic fault code that identifies Electronic starter fault or Motor Control Module (MCM) internal failure. This DiagTechPro reference summarizes the official 1-page Detroit diagnostic sheet so a technician can confirm the condition before opening the truck, and it links to the full downloadable PDF.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) diesel engines |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault condition | Electronic starter fault or Motor Control Module (MCM) internal failure |
| Published source | TruckFaultCodes.com, Copyright © 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 677 FMI 14 diagnostic overview
This one-page Detroit sheet covers an electronic starter fault or a Motor Control Module (MCM) internal failure. The technician first checks whether the engine cranks and starts; if it does, the codes are cleared and the engine is started three times to confirm the fault does not return before releasing the vehicle. If the engine does not crank and start, the sheet directs the technician to contact the Detroit Customer Support Center at 800-445-1980 for further diagnostic assistance.
Document table of contents
- Fault code identification
- Crank and start verification
- Code clear and repeat-start check
- Customer Support Center contact
Applicable truck models covered
This diagnostic applies to Detroit DD Series (EPA 2007-Current) diesel engines across all model years, and is also grouped under the Series 60 (DDEC VI – EPA 2007) DTCs. It concerns the electronic starting circuit managed by the Motor Control Module. For the OEM wiring schematics referenced in this procedure, see the official Detroit engine manufacturer site.
Who needs the SPN 677 FMI 14 manual
Workshop technicians and fleet owners using the diesel diagnostic tool to read Detroit fault codes and test the engine starter and Motor Control Module wiring will need this sheet. The full step-by-step PDF is available in the DiagTechPro manuals library, and a free account is required to download it.
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