Yamaha YZF-R1, Service Manual

Page: 687 / 808

P0638
9-190
4. Wire harness continuity.
• Disconnect the throttle servo motor coupler “1”, ECU coupler “2” and electronic throttle valve fuse
“3”.
• Open circuit check
• Short circuit check
TIP
Disconnect the ECU related connectors before checking.
Refer to “PARTS CONNECTED TO THE ECU” on page 9-3.
Ground short circuit check “A”
NO
a. Replace the electronic throttle valve fuse.
b. Turn the main switch to “ON”, and then 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 throttle servo motor coupler and ECU cou-
pler yellow/red–yellow/red
light green/red–light green/red
Between ECU coupler and electronic throttle valve
fuse holder
red/blue–red/blue
Is resistance 0
Ω
?
YES
→
Go to “Short circuit check”.
NO
a. Replace the wire harness.
b. Turn the main switch to “ON”, and then 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”.
Between ECU coupler “2” and ground
yellow/red–ground
light green/red–ground
red/blue–ground
Lg / R Y
/ R
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
2
1
3