ABS Wheel Speed Sensor
2016 Ford F-150 · 3.5L V6 EcoBoost
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Four locations: one at each wheel hub assembly, mounted in steering knuckle (front) or axle housing (rear), air gap to tone ring approximately 0.5mm
Pins
2-pin connector
Timebase
10ms/div at 15 mph
Voltage Scale
2V/div
Trigger
2.5V rising edge
Wiring
Varies by location - Front Left: White/Light Blue (+) and Gray/Orange (-), Front Right: Brown/White (+) and Gray/Red (-), signals are differential pair
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0.2V to 4.8V
Expected Pattern
Square wave digital signal, 48 pulses per wheel revolution from 48-tooth tone ring, active sensor powered by ABS module
Known-Good Waveform
At 15 mph, expect clean square wave transitions between approximately 0.5V (low) and 4.5V (high) at roughly 10 Hz per mph (150 Hz at 15 mph). Rise and fall times should be crisp with less than 1ms transition time. All four sensors should show nearly identical frequency at same vehicle speed with no more than 2-3% variance.
Common Failure Patterns
No signal (flat line at 0V) from one sensor
Cause: Failed Hall-effect sensor, damaged wiring, or corroded connector, common on rear sensors due to road debris and corrosion
Distorted square wave with rounded edges or inconsistent amplitude
Cause: Excessive air gap between sensor and tone ring due to bearing wear, damaged tone ring teeth, or sensor backing out of mount
Diagnostic Tips
F-150s with larger tires or leveling kits often develop ABS sensor codes due to increased bearing load causing excessive hub runout. Always compare all four sensor signals simultaneously during a road test - frequency should match vehicle speed precisely. These are active sensors powered by the ABS module, so 0V typically indicates a circuit fault, not just stationary vehicle.
Related Diagnostic Trouble Codes
C0035C0040C0045C0050
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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