This Detroit SPN 3471 high troubleshooting sheet documents fault code SPN 3471/FMI 3, HC Electronic Dosing Valve (EDV) Circuit Failed High, on Detroit DD Series engines. It tests the EDV circuit for a short to power and internal shorts using a diesel diagnostic tool and a multimeter. The monitored parameter is the EDV circuit, with a 10% derate.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | DD Series diesel engines (DD13, DD15, DD16), EPA 2007 and newer |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 3471 / FMI 3 |
| Emission tier | All years |
| Publication no. | Detroit Power Service Literature (via TruckFaultCodes.com, © 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Detroit SPN 3471 high table of contents
- Fault code identification: SPN 3471, FMI 3
- Description: EDV circuit, MIL/CEL lamps and 10% derate
- Steps 1-3: EDV voltage test (4.5 volt threshold)
- Steps 4-6: MCM 120-pin resistance between pins 1 and 2
- Decision: repair short or replace the Metering Unit
- Step 7: Purge Hydrocarbon Doser routine to verify repairs
Applicable truck models
This procedure applies to Detroit DD Series diesel engines and checks the wiring between the EDV connector and pins 64 and 65 of the MCM 120-pin connector. A high reading points to a short to power or a failed metering unit. See Detroit’s official service literature portal for the authoritative Detroit repair procedures.
Who needs this Detroit SPN 3471 high manual
Diesel electrical technicians diagnosing a high EDV circuit will use this sheet to separate a wiring short to power from an internal metering-unit fault. It suits workshops repairing Detroit hydrocarbon doser circuits.
The full PDF is available in the DiagTechPro manuals library — a free account is required to download. It is offered for reference alongside your Detroit diesel diagnostic tool. DiagTechPro catalogues Detroit fault-code documents so technicians can locate the exact SPN and FMI they are chasing without paging through a full engine service manual. Each entry lists the page count, file size and emission tier up front, and links to the closely related codes shown below so a diagnosis can move quickly from one fault to the next.
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