3-28 FUEL SYSTEM (DFI)
Troubleshooting the DFI System
When the service code [A] is displayed, for first ask the
rider about the conditions [B] of trouble, and then start to
determine the cause [C] of problem.
As 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 yellow engine warning indicator light (LED).
Do not rely solely on the DFI self-diagnosis function, use
Even when the DFI system is operating normally, the yel-
low engine warning indicator light (LED) goes on may be
displayed under strong electrical interference. Additional
measures are not required. Turn the ignition switch off to
stop the indicator.
If the yellow engine warning indicator light (LED) of the
motorcycle brought in for repair still goes on, check the ser-
When the repair has been done, the yellow engine
warning indicator light (LED) goes off after the service
code erasing procedure (see Service Code Erasing in the
Self-Diagnosis System chapter) is done.
When the motorcycle is down, the vehicle-down sensor
operates and the ECU shuts off the fuel pump relay, fuel
injectors and ignition system. The ignition switch is left on.
If the starter button is pushed, the electric starter turns but
the engine does not start. To start the engine again, raise
the motorcycle, turn the ignition switch off, and then on.
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.