Crankshaft Position Sensor
2021 Toyota RAV4 · 2.5L I4
Sensor Type
variable-reluctance
Waveform Type
ac-sine
Location
Right side of engine block, near the crankshaft pulley, behind the timing chain cover, reading from a 34-tooth reluctor wheel with 2 missing teeth
Pins
2-pin connector
Idle Frequency
46 Hz
Timebase
20ms/div
Voltage Scale
2V/div
Trigger
0V, rising edge
Wiring
Two-wire configuration: NE+ (Gray wire) and NE- (Black wire with white stripe). Signal is AC differential output
Expected Voltage Range
At Idle
-1.5V to 1.5V
At Higher RPM
-8V to 8V
Expected Pattern
34 teeth with 2 missing teeth gap, creating 32 visible pulses per revolution with a distinctive wide gap indicating crankshaft position reference point
Known-Good Waveform
Clean AC sine wave pattern with consistent amplitude across all teeth, showing regular pulses with a clear two-tooth gap occurring once per crankshaft revolution. At idle (approximately 700 RPM), expect 32 pulses followed by a gap approximately twice the width of normal tooth spacing. Amplitude should increase proportionally with RPM, reaching 6-8V peak-to-peak at 3000+ RPM.
Common Failure Patterns
Weak or erratic amplitude, inconsistent peak voltages, or signal dropping out intermittently
Cause: Sensor air gap too large due to mounting bolt loosening or sensor backing out from vibration, common on high-mileage RAV4s
Complete loss of signal or flat line waveform
Cause: Open circuit in sensor coil winding or damaged wiring harness where it passes near engine mount, known issue from engine movement stress
Noisy signal with irregular baseline or electromagnetic interference spikes
Cause: Debris buildup on reluctor wheel or sensor tip, or damaged shielding on sensor wiring allowing EMI from alternator or ignition system
Related DTCs: P0339
Diagnostic Tips
On the 2.5L A25A-FKS engine, verify air gap is 0.5-1.2mm. This VR sensor is sensitive to contamination from timing chain debris, especially on vehicles with deferred oil changes. Check for metallic particles on sensor tip.
Related Diagnostic Trouble Codes
P0335P0336P0337P0338P0339
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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