Yamaha R15 2022 Service Manual page 412

FUEL INJECTION SYSTEM TROUBLESHOOTING
Fault code No. P0657
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 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).
2 Wire harness continuity.
3 Malfunction in ECU.
4 Delete the fault code and check
that the engine trouble warning
light goes off.
P0657
Fuel system voltage: normal voltage is not supplied to the fuel injec-
tor and fuel pump.
Able to start engine
Able to drive vehicle
09
Fuel system voltage (battery voltage)
Approximately 12.0
Compare the actually measured battery voltage with the tool displayed
value.
(If the actually measured battery voltage is low, recharge the battery.)
Maintenance job
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Open or short circuit → Replace
the wire harness.
Between fuse box and fuel
pump coupler.
red–red
Between ECU coupler and right
handlebar switch coupler.
red/white–red/white
Between right handlebar switch
coupler and main switch cou-
pler.
brown–brown
Between main switch coupler
and fuse box.
red–red
Between fuse box and battery
terminal.
red–red
Replace the ECU.
Confirm that the fault code has
a condition of "Recover" using
the YDT, and then delete the
fault code.
8-79
ELEC
Confirmation of service com-
pletion
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 4 and finish the service.
Condition is "Malfunction" → Go
to item 2.
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 4 and finish the service.
Condition is "Malfunction" → Go
to item 3.
Service is finished.
– +