Safe to driveTo the nearest safe stop
J1939 code SPN 655. Below — how the fault is worded at the factory by DAF, Dongfeng, Isuzu, KAMAZ, MAZ, Renault Trucks and YaMZ, and what the second half of the code (FMI) means in the standard.
DAFDongfengIsuzuKAMAZMAZRenault TrucksYaMZ
| FMI 5 | Cylinder #5 injector open circuit/short to ground |
| FMI 7 | Cylinder #5 injector mechanical fault |
| FMI 5 | Fault in injector 5 circuit |
| FMI 3 | Open circuit in injection nozzle #5 drive system (P0205) |
| FMI 3 | Cylinder 5 injector: fault / warning |
| FMI 5 | Cylinder 5 injector. K-line code on KamAZ-5490: MR2 15427. |
| FMI 6 | Cylinder 5 injector. K-line code on KamAZ-5490: MR2 15428. |
| FMI 7 | Cylinder 5 injector. K-line code on KamAZ-5490: MR2 15426. |
| FMI 8 | Cylinder 5 injector: fault / warning |
| FMI 11 | Cylinder 5 injector: fault / warning |
| FMI 12 | Cylinder 5 injector: fault / warning. K-line code on KamAZ-5490: MR2 19444. |
| FMI 14 | Cylinder 5 injector. K-line code on KamAZ-5490: MR2 19445. |
| FMI 3 | Cylinder 5 injector driver circuit fault - Negative wire shorted to battery. Blink code: 1-4-5. Power will be reduced. Repair: Check the injector connectors and harness. |
| FMI 8 | Cylinder 5 injector driver circuit fault - Negative wire shorted to positive wire. Blink code: 1-4-5. Power will be reduced. Repair: Check the injector connectors and harness. |
| FMI 11 | Cylinder 5 injector driver circuit fault - Depends on calibration. Blink code: 1-4-5. Power will be reduced. Repair: Check the injector connectors and harness. |
| FMI 12 | Cylinder 5 injector driver circuit fault - Open circuit. Blink code: 1-4-5. Power will be reduced. Repair: Check the injector connectors and harness. |
| FMI 3 | Injector 2, cylinder 5, short to battery voltage. Repair: Check the injector (impedance at 20 °C from 0.3 to 0.5 ohms) and the wiring (A 23, A 42, A 43). |
| FMI 4 | Cylinder 5 injector (unit pump) — short to ground or open circuit. Repair: Check the pump winding and the wiring (J 1/11, J 1/41). Check the injector (impedance at 20 °C from 0.3 to 0.5 ohms). Check injectors 4, 5 and 6. |
| FMI 5 | Injector 2, cylinder 5, open circuit. Repair: Check the injector (impedance at 20 °C from 0.3 to 0.5 ohms). |
| FMI 8 | Pump or injector of cylinder 5, mechanical fault. Repair: Mechanical fault. |
| FMI 11 | Injector 2, cylinder 5, unidentified fault. Repair: Check the injector (impedance at 20 °C from 0.3 to 0.5 ohms) and the wiring (A 23, A 42, A 43). If the fault persists, replace the EECU. |
| FMI 3 | Cylinder 5 injector driver circuit fault (Negative wire shorted to battery). Blink code: 1-4-5. Power will be reduced. Repair: Check the injector connectors and harness. |
| FMI 8 | Cylinder 5 injector driver circuit fault (Negative wire shorted to positive wire). Blink code: 1-4-5. Power will be reduced. Repair: Check the injector connectors and harness. |
| FMI 11 | Cylinder 5 injector driver circuit fault (Calibration dependent). Blink code: 1-4-5. Power will be reduced. Repair: Check the injector connectors and harness. |
| FMI 12 | Cylinder 5 injector driver circuit fault (Open circuit). Blink code: 1-4-5. Power will be reduced. Repair: Check the injector connectors and harness. |
Safe to drive. Below — how much time you have and what happens if you keep going.
Fuel is not arriving in the right amount or at the right pressure. It shows up first on climbs and under load.
You will most likely stall out on the road, and may not restart on the shoulder. A clogged filter or water in the tank you can nurse to a shop; a failing injection pump you cannot.
This is an electrical fault: an open, a short or a bad contact in the sensor circuit. The value it measures is most likely fine. You can drive. But until the circuit is repaired this system runs blind and cannot warn you about a real failure.
Check the fuel filter and water trap, drain the water. In cold weather, suspect fuel waxing.
This code is often not the fault itself but a knock-on. If any of these is in the same readout, start with it:
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.