ABS Wheel Speed Sensor
2022 Ford F-150 · 3.5L V6 EcoBoost
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Four active sensors mounted in each wheel hub bearing assembly (front and rear), sensors are integral to the hub bearing and non-serviceable separately
Pins
2-pin connector
Timebase
10ms/div at 25 mph, 5ms/div at 60 mph
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
Varies by wheel position - typically White/Yellow (+) and White/Light Blue (-) for front sensors, specific colors coded in wiring diagram by position
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0.3V to 5V
Expected Pattern
Clean square wave digital signal alternating between approximately 0.5V and 4.5V, frequency increases proportionally with wheel speed
Known-Good Waveform
Active hall-effect sensors produce clean square wave signals even at very low speeds (under 5 mph). At 25 mph, expect approximately 80-100 Hz frequency with crisp transitions between low (0.5V) and high (4.5V) states. All four wheel speed sensors should show nearly identical frequency when driving straight at constant speed, with variance less than 2-3 Hz indicating proper operation.
Common Failure Patterns
No signal output, flat line at 0V or 5V
Cause: Failed wheel bearing hub assembly with integrated sensor, broken wiring, or corroded connector
Erratic signal with missing pulses or inconsistent amplitude
Cause: Damaged tone ring in hub bearing, excessive bearing play, or water intrusion in connector
Diagnostic Tips
F-150 uses active hall-effect sensors requiring power and ground; verify battery voltage at sensor connector before condemning sensor. These sensors are integrated into the hub bearing assembly and cannot be replaced separately - entire hub must be replaced. Check for TSB 21-2390 regarding false ABS/traction control warnings on 2021-2022 models.
Related Diagnostic Trouble Codes
C0035C0040C0045C0050
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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