Yamaha MT-09 2021 - Page 629

9-199
P056C
• Short circuit check
TIP
Disconnect the ECU related connectors before checking.
Refer to “PARTS CONNECTED TO THE ECU” on page 9-4.
Ground short circuit check “A”
Lines short circuit check “B”
Is resistance 0 Ω?
YES
→Go to “Short circuit check”.
NO
a. Replace the wire harness.
b. Turn the main switch to “ON”.
c. Operate the rear brake pedal, 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 11, and complete the service.
NO
→Go to “Short circuit check”.
Between brake light relay coupler “4” and
ground
light green/black–ground
Between front brake light switch coupler “2” and
ground
green/white–ground
green/yellow–ground
Brake light relay coupler “4” light green/black–any other coupler terminal
Front brake light switch coupler “2”
green/white–any other coupler terminal
green/yellow–any other coupler terminal
Rear brake light switch coupler “3”
green/yellow–any other coupler terminal
light green/black–any other coupler terminal
ECU coupler “5” light green/black–any other coupler terminal
Gy LLVP P/WLg/LO/WY/LL/B
B/LB/LBr/WGy/GG/LBr/LB/YL/W
W/YW/GG/WG/WLg/BL/WL/Y
Y
L/R
B Lg/B
G/W Y/B
G/Y
Y/W
Y
L/R
B Lg/B
G/W Y/B
G/Y
Y/W
G/Y Y/B
Lg/B
Lg/L
BA
52
2
3
4
4