ABS Wheel Speed Sensor
2017 Toyota Corolla · 1.8L I4
Sensor Type
hall-effect
Waveform Type
ac-sine
Location
Four sensors: one at each wheel hub assembly, mounted to steering knuckle (front) and axle beam/trailing arm (rear)
Pins
2-pin connector
Timebase
10ms/div at 25 mph
Voltage Scale
500mV/div
Trigger
0.5V, rising edge
Wiring
Front left: White/Black stripe (signal), Brown (ground); Front right: White (signal), Brown/Red stripe (ground); Rear sensors similar coding with shield drain
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0.3V to 2.5V
Expected Pattern
AC sine wave with frequency proportional to wheel speed, 48 pulses per revolution from tone ring
Known-Good Waveform
At 25 mph, expect clean sine wave at approximately 40-50 Hz with amplitude of 0.5-2.0V peak-to-peak. All four sensors should show similar frequency at same vehicle speed with consistent amplitude. Signal should be smooth without dropouts, flat spots, or irregular spacing between peaks.
Common Failure Patterns
No signal or very weak amplitude below 0.2V
Cause: Damaged tone ring teeth, excessive bearing play increasing air gap, failed sensor element
Irregular spacing between pulses or missing teeth pattern
Cause: Broken or damaged tone ring, debris buildup on sensor tip, cracked sensor housing
Diagnostic Tips
Compare all four sensor signals simultaneously during test drive - they should match at same vehicle speed. These are active magnetic sensors requiring proper wheel bearing preload; excessive play will cause erratic signals or ABS activation.
Related Diagnostic Trouble Codes
C0035C0040C0045C0050
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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