Yamaha YZF-R1 2020 Service Manual page 744

ECU coupler "2"
Relay unit coupler "3"
A
1
Br/Y R/L
Is resistance ∞ Ω?
YES
→ Go to step 5.
NO
a. Replace the wire harness.
b. Execute the diagnostic mode. (Code D42)
Is it hear operating sound?
YES
→ Go to step 6.
NO
→ Go to step 5.
5. Malfunction in ECU.
• Replace the ECU, and complete the service.
Refer to "REPLACING THE ECU (Engine Control Unit)" on page 8-41.
6. Delete the DTC and check that the MIL goes off.
• Start the engine and let it idle for approximately 5 seconds.
• Confirm that the DTC has a condition of "Recovered" using the malfunction mode of the YDT, and
then delete the DTC.
brown/yellow–any other coupler terminal
red/blue–any other coupler terminal
B
1
Br/Y R/L
3
Br/W L/W
L/R L/W R/W L/B L/Y
9-249
2
Y / R P / W P / B Gy / G
Lg / R L / R O / B L / B G / B
R / L G / Y Br / R Br / B Br / Y Sb / W
R / G Y / B L / W Y / L Sb
R/W L R/L
Sb B/Y Sb/W
P21D1
O / G Gy / R O
R / B B
W / L B
R / L B / W B / W