ABS Wheel Speed Sensor
2018-2024 Toyota Camry · 3.5L V6
Sensor Type
hall-effect
Waveform Type
dc-square
Location
One at each wheel hub assembly, mounted in the steering knuckle (front) or axle carrier (rear) reading a tone ring on the wheel bearing
Pins
2-pin connector
Timebase
10ms/div at 25 MPH, 5ms/div at 50 MPH
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
Varies by wheel position - typically White/Black and White/Red (LF), White/Blue and White/Green (RF), White/Yellow and Brown (LR), Pink and Light Green (RR)
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0.3V to 5V
Expected Pattern
Digital square wave at driving speeds, 48 pulses per wheel revolution, frequency proportional to wheel speed
Known-Good Waveform
Clean digital square wave switching between approximately 0.3V and 4.8-5.0V with crisp transitions. At constant speed, frequency should be consistent with equal pulse width and amplitude. All four sensors should show identical frequency at the same vehicle speed with no wheel slip.
Common Failure Patterns
No signal output, flat line at 0V or 5V
Cause: Failed hall-effect sensor IC, damaged tone ring, or broken wire
Erratic signal with missing pulses or amplitude variation
Cause: Damaged or contaminated tone ring, excessive bearing play, or corroded connector
Diagnostic Tips
These are active sensors requiring power (typically 5V or 12V from ABS module). Check for battery voltage at sensor connector with key on. Common issue is water intrusion at rear wheel connectors causing corrosion. Sensor air gap is not adjustable - if bearing play exists, replace wheel bearing assembly.
Related Diagnostic Trouble Codes
C0035C0040C0045C0050
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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