Yamaha YZF-R1 Series Service Manual page 715

Between shift sensor coupler and ECU coupler
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 shift sensor coupler "1" and ground
Lines short circuit check "B"
Shift sensor coupler
ECU coupler "2"
A
1
B/L V L
black/blue–black/blue
violet–violet
blue–blue
2
1
L/B
B/L V L
L/W B/Y
L/Y L/W
violet–ground
blue–ground
black/blue–any other coupler terminal
violet–any other coupler terminal
blue–any other coupler terminal
black/blue–any other coupler terminal
violet–any other coupler terminal
blue–any other coupler terminal
B
9-218
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
1 2
B/L V L
L/B
L/W B/Y
L/Y L/W
P1806, P1807
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