Celica ST Ltd Ed Liftback L4-1762cc 1.8L DOHC MFI (1997)
Throttle Position Sensor: Description and Operation
CIRCUIT DESCRIPTION
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 ~ 0.8 V is applied to terminal VTA of the ECM. The voltage applied to the terminal VTA of the ECM increases in
proportion to the opening angle of the throttle valve and becomes approximately 3.2 ~ 4.9 V when the throttle valve is fully opened. The ECM
judges the vehicle driving conditions from this signals input from terminals VTA, and uses it as one of the conditions for deciding the air-fuel ratio
correction, power increases correction and fuel-cut control etc.
