This Detroit SPN 3471 low troubleshooting sheet documents fault code SPN 3471/FMI 4, HC Doser Circuit Failed Low, on Detroit DD Series engines. It isolates a short to ground on the Electronic Dosing Valve (EDV) harness with resistance measurements. The monitored parameter is the HC doser circuit, carrying a 25% 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 4 |
| Emission tier | All years |
| Publication no. | Detroit Power Service Literature (via TruckFaultCodes.com, © 2017) |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Detroit SPN 3471 low table of contents
- Fault code identification: SPN 3471, FMI 4
- Description: HC doser circuit, MIL/CEL lamps and 25% derate
- Steps 1-2: disconnect EDV sensor and MCM 120-pin connector
- Step 3: pin 1 EDV harness resistance to ground (5 ohm limit)
- Step 4: pin 2 EDV harness resistance to ground
- Decision: repair short circuit or replace the EDV
Applicable truck models
This procedure applies to Detroit DD Series diesel engines and checks the EDV sensor harness pins 1 and 2 for a short to the battery ground lug by the starter. A reading under 5 ohms indicates a harness short rather than a valve failure. See Detroit’s official service literature portal for the authoritative Detroit repair procedures.
Who needs this Detroit SPN 3471 low manual
Technicians who read SPN 3471/FMI 4 will use this single-page sheet to confirm a low (shorted) HC doser circuit before condemning the EDV. It suits workshop owners who want a fast, measurement-based decision.
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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