The Detroit water pump defect document is a Detroit fault code reference that explains a water pump mechanical defect detected by the engine controller, published for DD Series engines under SPN 5927 FMI 7 (GHG14). It gives workshop technicians the diagnostic sequence used to confirm the condition and return the truck to service, sourced from Detroit Power Service Literature.
Official document details
| Brand | Detroit (Detroit Diesel) |
| Model coverage | DD Series (EPA 2007-Current) and Series 60 (DDEC VI) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Fault code | SPN 5927 / FMI 7 |
| Emissions family | GHG14 |
| Pages | 5 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 5927 / FMI 7
- Fault description and causes
- Cooling system inspection steps
- Water pump speed signal monitoring
- MCM2.1 harness resistance and voltage checks
Troubleshooting the Detroit water pump defect code
The routine checks for multiple codes, compares coolant inlet and outlet temperatures with the engine cold, and works through the cooling system — thermostat, radiator and charge air cooler, fan belt, shroud, hoses and viscous fan. It then monitors the water pump speed signal against engine speed and measures resistance and voltage at the water pump speed sensor and the MCM2.1 120-pin connector to isolate a shorted, open or grounded circuit.
Applicable truck models and engines
This diagnostic sheet applies to Detroit DD Series diesel engines built to EPA 2007 through current emissions standards, and the covered fault also appears on Series 60 (DDEC VI) applications listed in the source. Confirm the exact engine family and calibration against the vehicle before making repairs, and cross-check the specifications on the official Demand Detroit website.
Who needs this Detroit water pump defect manual
Heavy-duty truck technicians, fleet maintenance staff and workshop owners diagnosing SPN 5927 FMI 7 with a diesel diagnostic tool will use this sheet to follow the correct steps rather than replacing parts by guesswork.
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