ABS Wheel Speed Sensor
2019 Jeep Wrangler · 3.6L V6
Sensor Type
hall-effect
Waveform Type
dc-square
Location
One at each wheel hub - mounted in the steering knuckle (front) or axle housing (rear), reading tone ring on hub bearing or axle shaft
Pins
2-pin connector
Timebase
20ms/div at 5 mph, 5ms/div at 30+ mph
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
Varies by wheel position - typically Dark Green/White and Dark Green/Red for front, Yellow/Black and Light Green/Black for rear (active sensors with internal circuitry)
Expected Voltage Range
At Idle
0V to 5V
At Higher RPM
0V to 5V
Expected Pattern
Clean digital square wave switching between approximately 0.3V and 4.7V, frequency increases with wheel speed, 48 pulses per revolution typical
Known-Good Waveform
Square wave with sharp, clean transitions between low (0.3-0.5V) and high (4.5-4.8V). All four wheels should show identical frequency at same vehicle speed. At 30 mph, expect approximately 40-50 Hz. Pattern should be consistent with no missing teeth or amplitude variations.
Common Failure Patterns
No signal or flat line at battery voltage
Cause: Failed hall-effect sensor, broken wiring, or corroded connector
Intermittent dropouts or missing pulses in waveform
Cause: Damaged tone ring, excessive bearing play, debris on sensor face, or cracked sensor
Diagnostic Tips
JL Wrangler uses active hall-effect sensors requiring 12V power supply - verify power and ground first. Compare all four wheel speeds simultaneously; mismatched frequencies indicate problem wheel. Off-road use commonly damages tone rings and sensors - inspect for mud, rocks, and physical damage.
Related Diagnostic Trouble Codes
C0035C0040C0045C0050
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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