ABS Wheel Speed Sensor
2018 Toyota Camry · 2.5L I4 Hybrid
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Four sensors mounted in each wheel hub/knuckle assembly; front sensors mount to steering knuckle facing brake rotor reluctor ring, rear sensors mount to rear knuckle
Pins
2-pin connector
Timebase
10ms/div at 20 mph, 2ms/div at 60 mph
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
Front Left: White/Green (+) and Green/Blue (-); Front Right: White/Blue (+) and Blue/Yellow (-); Rear Left: White/Black (+) and Black/Red (-); Rear Right: White/Red (+) and Red/Yellow (-)
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0V to 5V
Expected Pattern
Square wave digital signal at 5V amplitude; 48 pulses per wheel revolution from 48-tooth reluctor ring; frequency increases linearly with wheel speed
Known-Good Waveform
Clean square wave transitioning between 0V and 5V with sharp rising and falling edges. At 20 mph, expect approximately 10-12 Hz (48 pulses per revolution). All four sensors should show identical frequency when driving straight; duty cycle should be 50% ±5%. No signal dropouts or amplitude variation should occur.
Common Failure Patterns
No signal (flat line at 0V) or intermittent dropouts
Cause: Damaged sensor from road debris impact, broken wire in harness near suspension travel points, or corroded connector
Weak amplitude (2-3V instead of 5V) or distorted square wave
Cause: Excessive air gap between sensor and reluctor ring due to worn wheel bearing, or debris buildup on sensor tip
Diagnostic Tips
Toyota uses active hall-effect sensors requiring 5V power supply from ABS module. Test all four sensors simultaneously while driving to identify mismatch. On hybrid models, regenerative braking activity can mask ABS sensor issues - test with regen disabled (D-mode, not B-mode).
Related Diagnostic Trouble Codes
C0035C0040C0045C0050
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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