Yamaha TMAX 2020 Service Manual page 677

EAS20704
64_ABS
EAS33335
TROUBLESHOOTING
Item
Rear wheel sensor power supply (voltage of power supply is low)
Procedure
1. Wire harness continuity.
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 rear wheel sensor coupler "1" and
ground
Lines short circuit check "B"
Rear wheel sensor coupler "1"
ABS ECU coupler "2"
A
1
B W
Is resistance  ?
YES
 Go to step 2.
NO
 Replace the wire harness.
2. Defective rear wheel sensor
Ground short circuit check "A"
Between rear wheel sensor coupler "1" and
ground
Lines short circuit check "B"
Rear wheel sensor coupler "1"
white–ground
black–ground
white–any other coupler terminal
black–any other coupler terminal
white–any other coupler terminal
black–any other coupler terminal
B
1
B W
white–ground
gray–ground
white–any other coupler terminal
gray–any other coupler terminal
9-203
64_ABS
2
W B B W W/Y G/R W/G
R/W
R/L
Lg Lg
G/Y Br/W Lg/L Lg/W B/L
B
B/G