Yamaha MT-09 2021 Service Manual page 636

3. Check the electronic throttle valve fuse.
Is check result OK?
YES
→ Go to step 4.
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 7, and complete the service.
NO
→ Go to step 4.
4. Wire harness continuity.
• Disconnect the throttle servo motor coupler "1", ECU coupler "2" and electronic throttle valve fuse
"3".
• Open circuit check
Between throttle servo motor coupler "1" and
ECU coupler "2"
Between ECU coupler "2" and electronic throttle
valve fuse holder "3"
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 7, and complete the service.
NO
→ Go to "Short circuit check".
• Short circuit check
1
3
Y/R Lg/R
9-206
yellow/red–yellow/red
light green/red–light green/red
red/blue–red/blue
2
Y/R
Lg/R
R/L
R/G
P0638
P/B O/G Gy/R O
L/B G/B R/B B
G/Y B
Y/R Y/B L/W R/L B/W B/W