Yamaha YZF-R1 2020 Service Manual page 797

EAS20699
53_ABS
EAS33327
TROUBLESHOOTING
Item
Vehicle system power supply (voltage of ABS ECU power supply is low)
Procedure
1. Defective battery
• Recharge or replace the battery, and check again.
Refer to "CHECKING AND CHARGING THE BATTERY" on page 8-42.
2. Defective coupler between the battery and the hydraulic unit assembly
• Check the coupler for any pins that may be pulled out.
• Check the locking condition of the coupler.
TIP
Turn the main switch to "OFF" before disconnecting or connecting a coupler.
Is check result OK?
YES
→ Go to step 3.
NO
→ If there is a malfunction, repair it and connect the coupler securely.
3. Wire harness continuity
• Disconnect the ABS ECU fuse "1" and ABS ECU coupler "2".
• Open circuit check
Between ABS ECU fuse holder and ABS ECU cou-
pler
Is resistance 0 Ω?
YES
→ Go to "Short circuit check".
NO
→ Replace the wire harness.
• Short circuit check
TIP
Disconnect the ABS ECU related connectors before checking.
Refer to "PARTS CONNECTED TO THE ABS ECU" on page 9-4.
Ground short circuit check "A"
Between ABS ECU coupler "1" and ground
1
9-302
red/black–red/black
2
Gy/B L Y G R/B B L/W
L/W
R/W
G/O W/L L B W W L/B
red/black–ground
53_ABS
B/W
B