International (Navistar)
J1939 SPN/FMI
SPN 3479 / FMI 3
International Fault Code SPN 3479 FMI 3: AFT Fuel Doser Valve – Short to PWR
SPN 3479 FMI 3 on International / Navistar trucks means: AFT Fuel Doser Valve – Short to PWR. The failure mode (FMI 3) is “voltage above normal, or shorted to high source”.
Code details
- Manufacturer
- International (Navistar)
- Applies to
- International MaxxForce DT (2010–2019)
- Fault code
- SPN 3479 FMI 3
- J1939 SPN
- 3479
- FMI
- 3 — Voltage above normal, or shorted to high source
- Truck models in source
- 3200, 4100, 4300, 4400, 7300, 7400, 7500, 7600, 7700, 8500, 8600, BE 200, CE Bus, CXT, DuraStar, LoneStar, MXT, ProStar, RXT, TranStar, WorkStar
What to do next
- Read active and inactive codes with the OEM service tool (Diamond Logic Builder can clear previously active codes) and note the occurrence count.
- FMI 3 tells the shop the type of failure to test for: voltage above normal, or shorted to high source.
- Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.
Get this code diagnosed
Send one request and nearby diesel shops and mobile mechanics can quote the repair.
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Related fault codes
- International Fault Code SPN 3479 FMI 4 — AFT Fuel Doser Valve – Open or Short to GND
- International Fault Code SPN 3479 FMI 5 — AFT Fuel Pressure Control Valve – Open or Short to GND on LOW Side
- International Fault Code SPN 3479 FMI 6 — AFT Fuel Pressure Control Valve – Open or Short to PWR on HIGH Side
Source: International MaxxForce DT 2010–2019 fault code list (Diesel Laptops). See also OBD-II codes.