Yamaha YZF-R1 2020 Service Manual page 801

EAS20666
57_ABS
EAS33292
TROUBLESHOOTING
Item
Vehicle CAN communication line or power source of vehicle system
Procedure
1. Wire harness continuity.
• Disconnect the ECU coupler "1", joint coupler "2" and ABS ECU coupler "3".
• Open circuit check
Between ECU coupler and joint coupler
Between the joint coupler and ABS ECU coupler
1
L/B
L/W
*. Joint coupler for YZF-R1
**. Joint coupler for YZF-R1M
Is resistance 0 Ω?
YES
→ Go to "Short circuit check"
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
Y/L P/W P V L L/R
B/Y Gy/G Br/W B/L W
L/Y L/W Gy/Y G/W G Gy/B W/L
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
blue/white–blue/white
blue/black–blue/black
blue/white–blue/white
blue/black–blue/black
Gy
W/B
3
blue/white–ground
blue/black–ground
9-306
57_ABS
Gy/B L Y G R/B B L/W
L/W B/W
R/W B
G/O W/L L B W W L/B