Suzuki GSF1250 Service Manual page 549

Step
3 1) Check that the rear wheel speed sensor is mounted
securely.
Is the sensor mounted securely?
Action
I718H1450068-01
Yes
Go to DTC "45"
(C1645). (Refer to "DTC
"45" (C1645): Wheel
Speed Sensor Circuit
Open (R) (Page 4E-
57)".)
ABS: 4E-56
No
Tighten the mounting
bolts or replace the
bracket if necessary.