ABS Wheel Speed Sensor (Front)
2017 Toyota Camry · 2.5L I4
Sensor Type
inductive
Waveform Type
ac-sine
Location
One at each front wheel hub, mounted to steering knuckle with sensor tip facing toothed reluctor ring on wheel bearing assembly
Pins
2-pin connector
Timebase
10ms/div at 15 mph, 2ms/div at 60 mph
Voltage Scale
1V/div at low speed, 2V/div at highway speed
Trigger
0V, rising edge
Wiring
White/Black and White (Right Front to ABS ECU), Yellow/Black and Yellow (Left Front to ABS ECU) - polarity insensitive
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
-4.5V to 4.5V
Expected Pattern
48 pulses per wheel revolution (48-tooth reluctor ring), clean AC sine wave with amplitude increasing with wheel speed
Known-Good Waveform
Signal should produce clean AC sine wave with symmetrical positive and negative peaks. At 5 mph expect 0.2-0.4V peak-to-peak, at 30 mph expect 1.5-2.5V peak-to-peak, at 60 mph expect 3.0-5.0V peak-to-peak. All four sensors should produce similar amplitude at same vehicle speed with consistent frequency spacing between teeth.
Common Failure Patterns
No signal or extremely weak signal (below 0.1V at 15 mph)
Cause: Excessive air gap between sensor and reluctor (should be 0.4-1.2mm), damaged reluctor teeth, failed sensor coil
Erratic amplitude variations, missing teeth in pattern
Cause: Damaged or broken reluctor ring teeth on wheel bearing, metallic debris on sensor tip, cracked sensor
Diagnostic Tips
Compare all four wheel speed sensor signals simultaneously during road test - amplitude should match between left/right at same speed. If signal is weak, check air gap with feeler gauge before replacing sensor; excessive gap often indicates worn wheel bearing on this chassis.
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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