Throttle Position Sensor
2021 Toyota Camry · 2.5L I4 Hybrid
Sensor Type
hall-effect
Waveform Type
dc-variable
Location
Integrated into electronic throttle body on intake manifold inlet, driver side of engine bay
Pins
6-pin connector
Timebase
500ms/div
Voltage Scale
1V/div
Trigger
Not applicable for DC signal
Wiring
VTA1: Blue, VTA2: Yellow, VC1: Red, VC2: Red/White, E2: Black (ground), Motor: Brown/White
Expected Voltage Range
At Idle
0.65V to 0.85V
At Higher RPM
3.8V to 4.5V
Expected Pattern
Dual redundant voltage signals (VTA1 and VTA2) that move in opposite correlation; VTA1 increases as throttle opens while VTA2 decreases proportionally
Known-Good Waveform
VTA1 rests at approximately 0.7-0.8V at closed throttle and rises smoothly to 4.0-4.3V at wide open throttle. VTA2 inversely starts at approximately 4.2V and decreases to 0.9V at WOT. Both signals move smoothly without steps, glitches, or dead spots through entire range with approximately 0.5V separation maintained throughout sweep.
Common Failure Patterns
VTA1 and VTA2 signals do not track inversely, correlation error with both rising or both falling
Cause: Internal potentiometer track contamination or wear, common cause of reduced power mode in hybrid models
Flat spots, steps, or voltage spikes in signal during slow throttle sweep
Cause: Carbon buildup on throttle plate causing binding or internal sensor element degradation
Diagnostic Tips
Hybrid powertrain uses throttle position for coordinating engine torque with MG2 motor output; perform throttle relearn with Toyota Techstream after any throttle body service. Monitor both VTA signals simultaneously during slow sweep to identify dead spots that cause hesitation.
Related Diagnostic Trouble Codes
P0120P0121P0122P0123P0124
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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