4 Runner 2WD L4-2693cc 2.7L DOHC MFI (1997)
Throttle Position Sensor: Description and Operation
Sensor Schematic
The throttle position sensor is mounted in the throttle body and detects the throttle valve opening angle.
When the throttle valve is fully closed, a voltage of approximately 0.3-0.8V is applied to terminal VTA of the ECM. When the throttle valve is
opened. The voltage applied to the terminals VTA of the ECM increases in proportion to the opening angle of the throttle valve and becomes
approximately 3.2 - 4.9V when the throttle valve is fully opened. The ECM judges the vehicle driving conditions from these signals input from
terminal VTA, uses it as one of the conditions for deciding the air-fuel ratio correction, power increase correction and fuel-cut control etc.
