Yamaha YZF-R1 2020 Service Manual page 746

→ Go to step 4.
NO
a. Connect the coupler securely or replace the wire harness.
b. Execute the diagnostic mode. (Code D43)
Is it hear operating sound?
YES
→ Go to step 6.
NO
→ Go to step 4.
4. Wire harness continuity.
• Disconnect the secondary injector #4 coupler "1", ECU coupler "2" and relay unit coupler "3".
• Open circuit check
Between secondary injector #4 coupler and ECU
coupler
Between secondary injector #4 coupler and relay
unit coupler
2
Y / R P / W P / B Gy / G O / G Gy / R O
Lg / R L / R O / B L / B G / B R / B B
R / L G / Y Br / R Br / B Br / Y Sb / W W / L B
R / G Y / B L / W Y / L Sb R / L B / W B / W
Is resistance 0 Ω?
YES
→ Go to "Short circuit check".
NO
a. Replace the wire harness.
b. Execute the diagnostic mode. (Code D43)
Is it hear operating sound?
YES
→ Go to step 6.
NO
→ Go to "Short 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"
Between secondary injector #4 coupler "1" and
ground
Lines short circuit check "B"
Secondary injector #4 coupler
brown/black–brown/black
red/blue–red/blue
1
Br/B R/L
brown/black–ground
red/blue–ground
brown/black–any other coupler terminal
red/blue–any other coupler terminal
9-251
P21D2
3
Br/W L/W R/W L R/L
L/R L/W R/W L/B L/Y Sb B/Y Sb/W