Yamaha R15 2022, Service Manual

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8-72
FUEL INJECTION SYSTEM TROUBLESHOOTING
– + ELEC
Fault code No. P0480
5 Defective ignition coil. Measure the primary coil resis-
tance of the ignition coil (2.2–
2.6
Ω
).
Replace the ignition coil, if out of
specification.
Start the engine and let it idle for
approximately 5 seconds.
Check the fault code using the
malfunction mode of the YDT.
Condition is “Recover”
→
Go to
item 7 and finish the service.
Condition is “Malfunction”
→
Go
to item 6.
6 Malfunction in ECU. Execute the diagnostic mode.
(Code No. 30)
No spark
→
Replace the ECU.
Service is finished.
7 Delete the fault code and check
that the engine trouble warning
light goes off. Confirm that the fault code has
a condition of “Recover” using
the YDT, and then delete the
fault code.
Fault code No. P0480
Item Normal signal is not received from the radiator fan motor relay.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. 51
Tool display
Actuates the radiator fan motor relay five times at five-second intervals.
The check indicator on the YDT screen come on each time the radiator
fan motor relay is actuated.
Procedure
Check that the radiator fan motor relay is actuated five times by listening
for the operating sound.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
1 Connection of radiator fan motor
relay coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
Turn the main switch to “ON”,
and then check the condition of
the fault code using the mal-
function mode of the YDT.
Condition is “Recover”
→
Go to
item 6 and finish the service.
Condition is “Malfunction”
→
Go
to item 2.
2 Connection of ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
Turn the main switch to “ON”,
and then check the condition of
the fault code using the mal-
function mode of the YDT.
Condition is “Recover”
→
Go to
item 6 and finish the service.
Condition is “Malfunction”
→
Go
to item 3.
Fault code No. P0351
Item
Ignition coil: open or short circuit is detected in the lead of the igni-
tion coil.
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