Yamaha Tracer MT09TRAH 2017 Service Manual page 449

Fault code No.
Item
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).
3 Wire harness continuity.
4 Defective relay unit.
5 Defective relay unit.
6 Malfunction in ECU.
7 Delete the fault code and check
that the engine trouble warning
light goes off.
P0657
Fuel system voltage: incorrect voltage supplied to the fuel injector
and fuel pump.
Improperly connected  Con-
nect the coupler securely or
replace the wire harness.
Open or short circuit  Replace
the wire harness.
Between battery and starter
relay (fuel injection system fuse)
.
red–red
Between starter relay (fuel injec-
tion system fuse) and relay unit
coupler.
red–red
Between relay unit coupler and
ECU coupler.
red/blue–red/blue
blue/yellow–blue/yellow
Execute the diagnostic mode.
(Code No. 50)
No operating sound  Replace
the relay unit.
Execute the diagnostic mode.
(Code No. 09)
Fuel system voltage is below 3
V  Replace the relay unit.
Replace the ECU.
Refer to "REPLACING THE
ECU (Engine Control Unit)" on
page 8-157.
Confirm that the fault code has
a condition of "Recovered"
using the Yamaha diagnostic
tool, and then delete the fault
code.
8-78
FUEL INJECTION SYSTEM
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 "Recovered"  Go
to item 7 and finish the service.
Condition is "Detected"  Go to
item 3.
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 "Recovered"  Go
to item 7 and finish the service.
Condition is "Detected"  Go to
item 4.
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 "Recovered"  Go
to item 7 and finish the service.
Condition is "Detected"  Go to
item 5.
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 "Recovered"  Go
to item 7 and finish the service.
Condition is "Detected"  Go to
item 6.
Service is finished.