Camshaft Position Sensor
2015 Toyota Corolla · 1.8L I4
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Mounted on cylinder head front timing cover, driver's side, monitoring the intake camshaft timing gear at 10 o'clock position
Pins
3-pin connector
Idle Frequency
25 Hz
Timebase
50ms/div at idle
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
Red/Yellow (12V power), White/Black (signal output), Black (ground)
Expected Voltage Range
At Idle
0.2V to 5V
At Higher RPM
0.1V to 5V
Expected Pattern
3 pulses per camshaft revolution (6 pulses per crankshaft revolution) with varying widths - one narrow, one medium, one wide to establish absolute position for VVT-i control
Known-Good Waveform
Clean digital square wave switching between 0.2V (low) and 5.0V (high) with three distinct pulse widths per revolution. The pattern should show consistent timing relationship with crankshaft sensor. During VVT-i operation, the phase relationship between cam and crank signals will shift as cam timing advances or retards, but pulse shape remains constant.
Common Failure Patterns
No signal output, stuck at 0V or 5V constantly
Cause: Hall effect sensor IC failure, often due to oil contamination through timing cover seal entering connector
Intermittent signal dropout or erratic switching between high and low states
Cause: Corroded connector pins from oil ingress or damaged wiring at connector, very common failure point on these engines
Diagnostic Tips
Check for oil leaks at timing cover and oil in connector before replacing sensor. Toyota TSB 0094-14 addresses P0016 codes related to VVT-i oil control valve sludge buildup requiring cleaning, not sensor replacement.
Related Diagnostic Trouble Codes
P0340P0341P0342P0343P0344
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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