This Detroit SPN 3471 open troubleshooting sheet documents fault code SPN 3471/FMI 5, HC Doser Circuit Failed Open, on Detroit DD Series engines. It checks the Electronic Dosing Valve (EDV) circuit for resistance and voltage faults using a diesel diagnostic tool. The monitored parameter is the HC doser 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 5 |
| Emission tier | All years |
| Publication no. | Detroit Power Service Literature (via TruckFaultCodes.com, © 2017) |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Detroit SPN 3471 open table of contents
- Fault code identification: SPN 3471, FMI 5
- Description: HC doser circuit, MIL/CEL lamps and 10% derate
- Steps 1-2: multiple-code check against SPN 3482/FMI 5
- Steps 3-5: EDV resistance measurement (18 ohm limit)
- Steps 6-7: EDV harness voltage test (11.5-12.5 volts)
- Step 8: Purge Hydrocarbon Doser routine to verify repairs
Applicable truck models
This procedure applies to Detroit DD Series diesel engines and traces the wiring between pin 64 and pin 65 of the MCM 120-pin connector and the EDV and Fuel Cutoff Valve. Open circuits and out-of-range EDV resistance point to specific repairs. See Detroit’s official service literature portal for the authoritative Detroit repair procedures.
Who needs this Detroit SPN 3471 open manual
Electrical and driveability technicians chasing an open hydrocarbon doser circuit will use this sheet to decide whether to replace the EDV or repair MCM wiring. It suits workshop owners handling Detroit emissions faults with a multimeter.
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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