Yamaha YZF-R1, Service Manual

Page: 691 / 808

P0657
9-194
• Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the
pins).
4. Wire harness continuity.
• Disconnect the fuel injection system fuse “1”, relay unit coupler “2”, ignition fuse “3”, handlebar
switch (right) coupler “4” and ECU coupler “5”.
• Open circuit check
Is the coupler condition normal ?
YES
→
Go to step 4.
NO
a. Connect the coupler securely or replace the wire harness.
b. Start the engine and let it idle for approximately 5 seconds.
c. Check the condition of the DTC using the malfunction mode of the YDT.
Is it in the “Recovered” condition ?
YES
→
Go to step 8, and complete the service.
NO
→
Go to step 4.
Between fuel injection system fuse holder and relay
unit coupler
brown/white–brown/white
Between ignition fuse holder and handlebar switch
(right) coupler
red/white–red/white
Between handlebar switch (right) coupler and relay
unit coupler
red/white–red/white
Between relay unit coupler and ECU coupler
red/blue–red/blue
blue/white–blue/white
Is resistance 0
Ω
?
YES
→
Go to “Short circuit check”.
NO
a. Replace the wire harness.
b. Start the engine and let it idle for approximately 5 seconds.
c. Check the condition of the DTC using the malfunction mode of the YDT.
Is it in the “Recovered” condition ?
YES
→
Go to step 8, and complete the service.
NO
→
Go to “Short circuit check”.
L / R L / W R / W L / B L / Y B / Y Sb / W Sb
L / W Br / W L R / L R / W
Y / R
Lg / R
R / L
R / G Y / L Y / B B / W R / L B / W Sb
G / Y W / L Br / R Br / Y
L / W
Br / B Sb / W B
Gy / R P / W O / G
O / B R / B
Gy / G
G / B L / B L / R B
P / B O
1
2
3
4
5