Yamaha YZF-R1 2020 Service Manual page 784

EAS20663
16_ABS
EAS33285
TROUBLESHOOTING
Item
Rear wheel sensor (open or short circuit)
Procedure
1. Defective coupler between the rear wheel sensor 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 2.
NO
→ If there is a malfunction, repair it and connect the coupler securely.
2. Wire harness continuity
• Disconnect the ABS ECU coupler "1" and rear wheel sensor coupler "2".
• Open circuit check
Between ABS ECU coupler and rear wheel sensor
coupler
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
white–white
black–black
1
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
white–ground
black–ground
9-289
2
B W
16_ABS