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FUEL INJECTION SYSTEM
Code No. 30 Symptom The motorcycle has overturned.
Used diagnostic code No. 08 (lean angle cut-off switch)
Inspection operation item and probable cause Operation item and countermeasure Reinstatement
method
Defective lean angle cut-off switch Replace if defective. Reinstated by turn-
ing the main switch
ON (however, the
engine cannot be
restarted unless
the main switch is
first turned OFF).
The motorcycle has overturned. Raise the motorcycle upright.
Installed state of the lean angle cut-off switch Check the installed area for looseness or
pinching.
Connected state of connector
Inspect the coupler for any pins that may
have pulled out.
Check the locking condition of the coupler.
If there is a malfunction, repair it and connect it
securely.
Lean angle cut-off switch coupler
Main wiring harness ECU coupler
Code No. 31 Symptom The amount of air-fuel ratio feedback compensation is maintained contin-
uously in the vicinity of the upper limit.
Used diagnostic code No. 01 (throttle position sensor)
Inspection operation item and probable cause Operation item and countermeasure Reinstatement
method
Defective O
2
sensor
(unable to output a rich signal).
Replace if defective. Reinstated by
starting the engine,
operating it at idle,
and then racing it
after it has warmed
up.
Clogged injector. Replace if defective.
Refer to “CHECKING THE INJECTOR”.
Open circuit or ground short in wiring harness
or sub lead.
Repair or replace if there is an open or short
circuit.
Main wiring harness
Black/Blue - White
Gray/Green - Blue
The fuel pressure is too low.
Compare the fuel pressure at idle and with
throttle open.
About the same → Normal
Too low → Inspect the fuel pump.
Inspect the delivery hose
for pinching or kinking.
Inspect the pressure reg-
ulator.
Inspect the throttle posi-
tion sensor.
Other:
Malfunction in the fuel system (disconnec-
tion, etc.).
Improper sealing of the intake system.
Replace if defective.
Refer to “CHECKING THE FUEL PUMP AND
PRESSURE REGULATOR OPERATION”.
Repair or replace if there is a malfunction.
Replace if defective.
Refer to “CHECKING THE FUEL PUMP AND
PRESSURE REGULATOR OPERATION”.
Execute diagnostic code 01.
Repair or replace if there is a malfunction.
Connected state of connector
Inspect the coupler for any pins that may
have pulled out.
Check the locking condition of the coupler.
If there is a malfunction, repair it and connect it
securely.
O
2
sensor coupler
Engine wiring harness coupler
Main wiring harness ECU coupler
Sub-wire harness coupler