Troubleshooting the DFI System
When an abnormality in the system occurs, the FI indi-
cator light (LED) goes on to alert the rider on the meter
panel. In addition, the condition of the problem is stored
in the memory of the ECU (Electronic Control Unit). With
the engine stopped and turned in the self-diagnosis mode,
the service code [A] is indicated by the number of times the
FI indicator light (LED) blinks.
When due to a malfunction, the FI indicator light (LED) re-
mains lit, ask the rider about the conditions [B] under which
the problem occurred and try to determine the cause [C].
Don't rely solely on the DFI self-diagnosis function, use
common sense; first conduct a pre-diagnosis inspection,
check the ECU for ground and power supply, the fuel line for
no fuel leaks, and for correct pressure. The pre-diagnosis
items are not indicated by the FI indicator light (LED).
Even when the DFI system is operating normally, the FI
indicator light (LED) [A] may light up under strong electrical
interference. No remedy needed. Turn the ignition switch
OFF to stop the indicator light.
When the FI indicator light (LED) goes on and the motor-
cycle is brought in for repair, check the service codes.
When the repair has been done, the light (LED) doesn't go
on. But the service codes stored in memory are not erased
to preserve the problem history, and the light (LED) can
display the codes in the self-diagnosis mode. The problem
history is referred when solving unstable problems.
Much of the DFI system troubleshooting work consists
of confirming continuity of the wiring. The DFI parts are
assembled and adjusted with precision, and it is impossible
to disassemble or repair them.
When checking the DFI parts, use a digital meter which
can be read two decimal place voltage or resistance.
Rear Seat (see Rear Seat Removal in the Frame chap-
Front Seat (see Front Seat Removal in the Frame chap-
Seat Cover (see Seat Cover Removal in the Frame
The DFI part connectors have seals, including the ECU.
When measuring the input or output voltage with the
connector joined, use the needle adapter set. Insert the
needle adapter inside the seal until the needle adapter
reaches the terminal.
Special Tool - Needle Adapter Set: 57001-1457
FUEL SYSTEM (DFI) 3-23