Crankshaft Position Sensor
2014 Jeep Wrangler · 3.6L V6
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Right side of engine block, above starter motor, reading from flexplate/flywheel tone ring
Pins
3-pin connector
Idle Frequency
50 Hz
Timebase
20ms/div
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
Orange (5V reference), Black/Light Blue (sensor signal), Black (ground)
Expected Voltage Range
At Idle
0.2V to 5V
At Higher RPM
0.1V to 5V
Expected Pattern
Clean square wave with consistent amplitude, 0-5V transitions representing teeth on reluctor wheel
Known-Good Waveform
Clean digital square wave alternating between approximately 0.2V and 5.0V with sharp, vertical transitions. At idle (approximately 700 RPM), frequency should be around 46-53 Hz with consistent pulse width and amplitude. No noise, dropouts, or rounding of edges should be present.
Common Failure Patterns
Intermittent signal dropout or complete loss of signal during operation
Cause: Internal Hall-effect element failure due to heat stress from starter proximity
Signal voltage does not reach full 5V, tops out at 3-4V
Cause: Weak 5V reference supply from PCM or high resistance in connector terminals
Related DTCs: P0335
Diagnostic Tips
The 3.6L Pentastar uses a Hall-effect sensor that is sensitive to oil contamination on the reluctor wheel teeth - check for oil leaks from rear main seal. Ensure mounting bolt torque is correct as vibration can cause sensor to back out, increasing air gap.
Related Diagnostic Trouble Codes
P0335P0336P0337P0338P0339
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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