ABS Wheel Speed Sensor
2011 Ford F-150 · 5.0L V8 Coyote
Sensor Type
variable-reluctance
Waveform Type
ac-sine
Location
One sensor at each wheel hub - front sensors mount to steering knuckle, rear sensors mount to axle housing near differential (4WD models)
Pins
2-pin connector
Timebase
10ms/div at 25 mph
Voltage Scale
2V/div
Trigger
0V, rising edge
Wiring
Front: White/Light Blue and Light Blue wires; Rear: White/Pink and Pink wires - varies by position
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
-8V to 8V
Expected Pattern
AC sine wave with amplitude and frequency increasing with wheel speed, approximately 50 pulses per wheel revolution from tone ring
Known-Good Waveform
At 25 mph, expect clean sine wave at approximately 150-200 Hz with amplitude of 1.5-4.0V peak-to-peak. Amplitude increases with speed - at 60 mph expect 5-8V peak-to-peak at 400-500 Hz. All four sensors should show similar frequency at same vehicle speed with uniform sine wave peaks.
Common Failure Patterns
Low amplitude (under 0.5V at 25 mph) or weak erratic signal
Cause: Excessive air gap between sensor and tone ring (should be 0.020-0.050 inches), wheel bearing wear causing runout
Missing teeth or irregular spacing in waveform pattern
Cause: Damaged tone ring teeth, metallic debris on tone ring, or cracked reluctor ring
Diagnostic Tips
2011-2014 F-150 4WD models are prone to front wheel bearing failure causing erratic WSS signals - compare all four sensors simultaneously while driving. Rear sensors on 4WD models are exposed to more debris - inspect tone rings for damage. Use AC coupling on scope and verify air gap with feeler gauge during hub service.
Related Diagnostic Trouble Codes
C0035C0040C0045C0050
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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