Crankshaft Position Sensor
2019 Jeep Wrangler · 3.6L V6
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Mounted on the engine block at the rear of the engine, driver's side, near the transmission bell housing, reading the reluctor ring on the flexplate/flywheel
Pins
3-pin connector
Idle Frequency
50 Hz
Timebase
10ms/div
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
Gray/Black (signal), Orange (5V reference), Black/Light Blue (ground)
Expected Voltage Range
At Idle
0.2V to 4.8V
At Higher RPM
0.1V to 4.9V
Expected Pattern
Clean square wave pattern with missing tooth gap - 58 teeth with 2-tooth gap (58-2 pattern) on flexplate reluctor wheel, producing consistent pulse train with one larger gap per revolution
Known-Good Waveform
Crisp square wave alternating between approximately 0.3V and 4.7V with consistent pulse width and amplitude. The missing tooth gap should be clearly visible once per crankshaft revolution as a double-width high or low period. At idle (600-700 RPM), frequency approximately 50 Hz with clean, vertical transitions.
Common Failure Patterns
Intermittent signal dropout or complete loss of square wave pattern, signal flat-lined at 0V or 5V
Cause: Sensor internal failure, broken wire in harness near transmission mount, or corroded connector pins due to heat exposure
Diagnostic Tips
The 3.6L Pentastar is notorious for crankshaft sensor connector corrosion due to proximity to exhaust heat. Check connector condition first and verify air gap is 0.020-0.040 inches if accessible. Compare correlation with camshaft sensors using DTC P0016/P0017 patterns.
Related Diagnostic Trouble Codes
P0335P0336P0337P0338P0339
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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