Troubleshooting the DFI System
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.
When checking the DFI parts, use a digital meter which
can be read two decimal place voltage or resistance.
The DFI part connectors [A] have seals [B], including the
ECU. When measuring the input or output voltage with the
connector joined, use the needle adapter set [C]. Insert
the needle adapter inside the seal until the needle adapter
reaches the terminal.
Special Tool - Needle Adapter Set: 57001-1457
Insert the needle adapter straight along the terminal
in the connector to prevent short-circuit between
Make sure that measuring points are correct in the con-
nector, noting the position of the lock [D] and the lead
color before measurement. Do not reverse connections
of a digital meter.
Be careful not to short-circuit the leads of the DFI or elec-
trical system parts by contact between adapters.
Turn the ignition switch on and measure the voltage with
the connector joined.
Incorrect, reverse connection or short circuit by
needle adapters could damage the DFI or electrical
FUEL SYSTEM (DFI) 3-29