Suzuki GRAND VITARA JB416 Service Manual page 245

Step
7 Refer to "Front Wheel Speed Sensor On-Vehicle Inspection:
" and/or "Rear Wheel Speed Sensor On-Vehicle Inspection:
", check output voltage or waveform.
Is specified voltage and/or waveform obtained?
Action Yes
Substitute a known-
good ABS (ESP®)
hydraulic unit / control
module assembly and
recheck.
ABS: 4E-22
No
Replace sensor and
recheck.