This page covers the Detroit fault code SPN 4814 FMI 5, Water Pump Circuit Failed Open, on DD Platform engines. It documents the Variable Speed Water Pump routine and the harness diagnostic flow.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD13, DD15 and DD16 (DD Platform) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Source | TruckFaultCodes.com |
| Year / Revision | 2017 (GHG14) |
| Pages | 2 |
| File size | 0.30 MB |
| Format | |
| Language | English |
SPN 4814 FMI 5 table of contents
- Fault description and CEL
- Warm-up and fault-active check
- Variable Speed Water Pump routine
- Water pump harness inspection
- Open circuit repair and verification
This fault illuminates the CEL and reports an open in the variable-speed water pump circuit. Diagnosis starts by warming the engine until coolant temperature is above 71 degrees C (160 degrees F) to see whether the fault is active.
The technician runs the Variable Speed Water Pump service routine to compare desired versus actual pump speed, cycling the ignition between attempts. If the fault stays active, the water pump harness connector is disconnected and inspected for bent, spread or corroded pins; otherwise the open circuit between pin 1 of the water pump connector and pin 50 of the MCM2.1 120-pin connector is repaired. Verification repeats the routine and, if needed, retains the log file for the Customer Support Center.
Applicable truck models
This guide applies to Detroit DD13, DD15 and DD16 engines under EPA 2007 / GHG14. The diagnosis references the MCM2.1 120-pin connector and the Customer Support Center (800-445-1980). For OEM specifications, visit Detroit’s official website.
Who needs this SPN 4814 FMI 5 manual
Technicians investigating a variable-speed water pump complaint or cooling concern on DD Series engines use this document to test the circuit and harness before replacing the pump. The guide follows the factory decision-tree troubleshooting format.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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