SPN 4375 FMI 5 is the Detroit DD Series (EPA 2007–Current) diagnostic trouble code that Detroit documents as “Diesel Exhaust Fluid (DEF) Pump Circuit Failed Open”. This 2-page GHG14 fault-code sheet documents the circuit description and the DEF pump connector pinout, the dash-lamp indication and engine reaction, and the ordered troubleshooting steps used to confirm and clear the condition. The fault points at an open in the DEF pump control circuit, and the sheet gives the four-pin DEF pump connector pinout and the resistance and continuity checks back to the ACM2.1 120-pin connector, verified by the SCR ADS Self-Check routine.
SPN 4375 FMI 5 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 | 0.24 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code description
- DEF pump harness disconnection and pin inspection
- DEF pump four-pin connector pinout
- Pump winding resistance measurement
- ACM2.1 120-pin wiring continuity checks
- SCR ADS Self-Check verification
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. The technician disconnects the DEF pump harness connector, inspects the pins, measures resistance between DEF pump pins 2 and 3 against 6K ohms, checks continuity between the pump connector and pins 20 and 1 of the ACM2.1 120-pin connector, and if the wiring is good installs a test ACM2.1 before rerunning the Selective Catalytic Reduction ADS Self-Check to verify the repair. 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 4375 FMI 5 manual
Diesel technicians, fleet maintenance teams and workshop owners diagnosing an open DEF pump circuit or an SCR dosing fault on a GHG14 DD engine on Detroit DD Series trucks use this sheet to work the fault in order instead of guessing. The included pinout and the ADS Self-Check verification make this a fast, unambiguous circuit diagnosis.
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