Camshaft Position Sensor
2021 Toyota RAV4 · 2.5L I4
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Intake camshaft sensor located on cylinder head front end near timing chain cover; exhaust camshaft sensor on opposite side. RAV4 uses dual VVT-i requiring both intake (G1) and exhaust (G2) sensors
Pins
3-pin connector
Idle Frequency
23 Hz
Timebase
50ms/div
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
Three-wire configuration: Power supply (5V - Pink wire), Ground (Black wire), Signal output (Blue or Gray wire depending on intake/exhaust position)
Expected Voltage Range
At Idle
0.2V to 4.8V
At Higher RPM
0.1V to 4.9V
Expected Pattern
3 distinct pulses per camshaft revolution with varying tooth widths to create unique position signature. Pattern includes one wide pulse, one medium pulse, and one narrow pulse per 360-degree cam rotation
Known-Good Waveform
Clean digital square wave transitioning sharply between approximately 0.3V (low) and 4.7V (high) with no rounding or sloping edges. The three pulses per camshaft revolution have distinct width differences allowing ECU to determine exact cam position. With VVT-i active, expect timing relationship between cam and crank sensors to shift smoothly during acceleration and deceleration as valve timing advances or retards.
Common Failure Patterns
Signal stuck at high (near 5V) or low (near 0V) with no transitions
Cause: Failed Hall effect IC inside sensor, often caused by oil contamination entering sensor housing through deteriorated O-ring seal
Rounded or sloped transitions instead of sharp square edges, or voltage not reaching full 0-5V range
Cause: Weak 5V reference supply from ECU due to poor ground connection at engine harness connector C201, or high resistance in sensor power supply circuit
Diagnostic Tips
The A25A-FKS engine uses advanced VVT-i on both cams. Always verify correlation between intake and exhaust cam sensors using ECU data. Check for oil leaks at VVT-i oil control valve gaskets as these often contaminate cam sensors on 2019-2021 models.
Related Diagnostic Trouble Codes
P0340P0341P0342P0343P0344
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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