Yamaha MBK X-MAX 300 2017 Service Manual page 371

Fault code No.
Item
6 Malfunction in ECU.
7 Delete the fault code and check
that the engine trouble warning
light goes off.
Fault code No. P0657
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
09
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.
P062F
EEPROM fault code number: an error is detected while reading or
writing on EEPROM.
Replace the ECU.
Refer to "REPLACING THE
ECU (Engine Control Unit)" on
page 8-128.
Confirm that the fault code has
a condition of "Recover" using
the Yamaha diagnostic tool, and
then delete the fault code.
P0657
Fuel system voltage: incorrect voltage supplied to the fuel injector
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 display val-
ue. (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 battery terminal and
main fuse 2.
red–red
Between main fuse 2 and main
switch.
red–red
Between main switch and main
fuse.
brown/red–brown/red
Between main fuse and ECU.
brown/red–brown/red
Replace the ECU.
Refer to "REPLACING THE
ECU (Engine Control Unit)" on
page 8-128.
8-66
FUEL INJECTION SYSTEM
Service is finished.
Confirmation of service com-
Start the engine and let it idle for
approximately 5 seconds.
Check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
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 condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recover" → Go to
item 4 and finish the service.
Condition is "Malfunction" → Go
to item 3.
Service is finished.
pletion