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Fault code No.
Item
5
Malfunction in ECU.
6
Delete the fault code.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Indicated
09
Procedure
Actuation
50
Procedure
Probable cause of mal-
Item
function and check
1
Connection of fuel pump re-
lay coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
2
Connection of ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
42
Speed sensor: no normal signals are received from the speed
sensor.
Replace the ECU.
43
Fuel system voltage: incorrect voltage supplied to the fuel in-
jector and fuel pump.
Able to start engine
Able to drive vehicle
09, 50
Fuel system voltage (battery voltage)
Approximately 12.0
Turn the main switch to "
measured battery voltage with the display value. (If the actually
measured battery voltage is low, recharge the battery.)
Actuates the fuel pump relay five times at one-second intervals.
The "CHECK" indicator and "
screen come on each time the relay is actuated.
(When the relay is on, the "CHECK" indicator and "
Yamaha diagnostic tool screen go off. When the relay is off, the
"CHECK" indicator and "
come on.)
Check that the fuel pump relay is actuated five times by listening
for the operating sound.
Maintenance job
Improperly connected →
Connect the coupler secure-
ly or replace the wire har-
ness.
Improperly connected →
Connect the coupler secure-
ly or replace the wire har-
ness.
8-51
FUEL INJECTION SYSTEM
Start the engine, and input
the vehicle speed signals by
operating the vehicle at 20 to
30 km/h (12 to 19 mph).
Check that the fault code
number is not displayed.
" (on), and then compare the actually
" on the Yamaha diagnostic tool
" on the Yamaha diagnostic tool screen
Confirmation of service
completion
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 2.
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 3.
" on the
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Troubleshooting
