One sensor at each wheel hub assembly, mounted in the steering knuckle (front) or axle carrier (rear), reading tone ring on hub bearing
Pins
2-pin connector
0
Timebase
10ms/div at 30mph, 5ms/div at 60mph
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
Front Left: White/Blue (signal) and Black (ground); Front Right: White/Red (signal) and Black (ground); Rear Left: White/Yellow (signal) and Black (ground); Rear Right: White/Green (signal) and Black (ground)
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0.2V to 5V
Expected Pattern
Digital square wave pattern at 60mph showing approximately 125-135 Hz frequency with clean transitions between 0V and 5V (48-pole tone ring), amplitude and frequency increase proportionally with wheel speed
Known-Good Waveform
Active Hall-effect sensors produce a clean digital square wave signal that switches between approximately 0.3V (low) and 4.7V (high) with sharp rise and fall times. At 30mph, expect 60-65Hz; at 60mph, expect 125-135Hz. All four wheel speed sensors should show nearly identical frequency when driving straight, with differences less than 2-3Hz indicating matched tire diameters and proper operation.
Common Failure Patterns
No signal output (flat line at 0V or 5V) at all speeds
These Tucson AWD models are prone to rear wheel speed sensor failures due to road salt and moisture intrusion at the rear axle carrier connector. Always compare all four sensor frequencies simultaneously while driving - mismatched frequencies often indicate tire size differences rather than sensor failure. Check for metal debris on magnetic tone ring and ensure sensor connector is sealed properly.
Related Diagnostic Trouble Codes
C0035C0040C0045C0050
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.