Yamaha YZF-R1 Series Service Manual page 622

YES
→ Go to step 4.
NO
a. Connect the coupler securely or 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 step 4.
4. Wire harness continuity.
• Disconnect the O sensor 2 coupler "1" and ECU coupler "2".
2
• Open circuit check
Between O sensor 2 coupler and ECU coupler
2
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
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 O sensor 2 coupler "1" and ground
2
Lines short circuit check "B"
O sensor 2 coupler
2
black/blue–black/blue
gray/yellow–gray/yellow
2
1
L/B
L/W B/Y
L/Y L/W
gray/yellow–ground
black/blue–any other coupler terminal
gray/yellow–any other coupler terminal
9-125
P/W P V L L/R Gy
Gy/G Br/W B/L W W/B
Gy/Y G/W G Gy/B W/L
P0152