Crankshaft Position Sensor
2017 Toyota Camry · 2.5L I4
Sensor Type
variable-reluctance
Waveform Type
ac-sine
Location
Front of engine block, above the crankshaft pulley at approximately 11 o'clock position, facing the crankshaft reluctor wheel with 34 teeth (2 missing for reference gap)
Pins
2-pin connector
Idle Frequency
45 Hz
Timebase
20ms/div
Voltage Scale
2V/div
Trigger
0V, rising edge
Wiring
Gray wire (signal) and Black wire (ground/return) - no reference voltage required for VR sensor
Expected Voltage Range
At Idle
-1.2V to 1.2V
At Higher RPM
-8.5V to 8.5V
Expected Pattern
34-2 tooth pattern with two consecutive missing teeth creating a reference gap, AC sine wave that increases in amplitude and frequency with RPM
Known-Good Waveform
Smooth AC sine wave with consistent amplitude across all teeth except for the distinctive double-width gap where two teeth are missing (reference point). At idle (approximately 700 RPM), expect 32 normal teeth producing peaks around ±1.2V followed by the reference gap showing a longer period between zero crossings. The waveform should be symmetrical above and below zero volts with no DC offset.
Common Failure Patterns
Erratic amplitude with some peaks significantly lower than others, inconsistent voltage swings
Cause: Worn or damaged reluctor wheel teeth, metal debris buildup on sensor tip, excessive air gap due to sensor backing out
Weak signal overall with amplitude less than 0.5V at idle or less than 3V at high RPM
Cause: Sensor coil degradation, increased air gap, sensor mounting loose or pushed back
Related DTCs: P0335
Diagnostic Tips
Check air gap specification (0.5-1.4mm typical) as this VR sensor is sensitive to distance from reluctor wheel. Metal shavings from timing chain wear can accumulate on the magnetic sensor tip causing erratic signals - inspect sensor tip for debris during diagnosis.
Related Diagnostic Trouble Codes
P0335P0336P0337P0338P0339
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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