Yamaha YZF-R1 2020 Service Manual page 811

NO
→ Replace the wire harness.
• Short circuit check
TIP
Disconnect the ECU and ABS ECU related connectors before checking.
Refer to "PARTS CONNECTED TO THE ECU" on page 9-3 and "PARTS CONNECTED TO THE ABS
ECU" on page 9-4.
Ground short circuit check "A"
Between ECU coupler "1" and ground
Between ABS ECU coupler "3" and ground
Lines short circuit check "B"
ECU coupler
Joint coupler "2"
ABS ECU coupler
A
1
L/B Y/L
L/W B/Y
L/Y L/W
3
Gy/B L Y G R/B B L/W
L/W
R/W
G/O W/L L B W W L/B
*. Joint coupler for YZF-R1
**. Joint coupler for YZF-R1M
Is resistance ∞ Ω?
YES
→ Go to step 3.
NO
→ Replace the wire harness.
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
B/W
B
blue/white–ground
blue/black–ground
blue/white–ground
blue/black–ground
blue/white–any other coupler terminal
blue/black–any other coupler terminal
blue/white–any other coupler terminal
blue/black–any other coupler terminal
blue/white–any other coupler terminal
blue/black–any other coupler terminal
B
1
L/B Y/L P/W P
L/W B/Y
L/Y L/W
3
Gy/B L Y G R/B B L/W
L/W
R/W
G/O W/L L B W W L/B
2
*
L/W L/W L/W L/W L/W L/W L/B L/B L/B L/B L/B L/B
**
L/W L/W L/W L/W L/W L/W L/W
L/B L/B L/B L/B L/B L/B L/B
9-316
V L L/R Gy
Gy/G Br/W B/L W W/B
Gy/Y G/W G Gy/B W/L
B/W
B
90_ABS