SPN 4814 FMI 3 is the Detroit DD Series (EPA 2007–Current) diagnostic trouble code that Detroit documents as “Water Pump Circuit Failed High”. This 2-page GHG14 fault-code sheet documents the circuit description and the Variable Speed Water Pump routine, the dash-lamp indication and engine reaction, and the ordered troubleshooting steps used to confirm and clear the condition. The fault illuminates the CEL and indicates the variable-speed water pump control circuit is shorted to battery voltage, so the sheet warms the engine, runs the Variable Speed Water Pump service routine and traces the wiring for a short to 12 volts at the MCM2.1 120-pin connector.
SPN 4814 FMI 3 document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-Current) engines |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Publication / source | Detroit Power Service Literature (TruckFaultCodes reference, 2017) |
| Emissions family | GHG14 |
| Pages | 2 |
| File size | 0.22 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code description
- Variable Speed Water Pump service routine
- Desired versus actual pump speed check
- Water pump harness and pin inspection
- MCM2.1 120-pin connector short-to-battery repair
Applicable truck models
This fault-code procedure applies to trucks powered by the Detroit DD Series (EPA 2007-Current) engines on the DD Series (EPA 2007–Current) platform. With the engine warmed above 71°C, the technician runs the Variable Speed Water Pump service routine, compares desired and actual pump speed, and if the fault is active disconnects the water pump harness connector and inspects the pins before repairing the short to battery between pin 1 of the connector and pin 50 of the MCM2.1 120-pin connector. Always confirm the engine family and GHG14 emissions level against the vehicle, and cross-check the latest procedure in the Detroit Power Service Literature on the official Detroit website.
Who needs this SPN 4814 FMI 3 manual
Diesel technicians, fleet maintenance teams and workshop owners diagnosing a high-side water pump circuit fault or a cooling complaint with the CEL on on Detroit DD Series trucks use this sheet to work the fault in order instead of guessing. The verification drive and Customer Support Center contact steps also cover pumps that fail intermittently.
The complete 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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