Supra Sport Roof L6-2997cc 3.0L DOHC MFI (1998)
Accelerator Pedal Position Sensor: Component Tests and General Diagnostics
DTC P1120 Accelerator Pedal Position Sensor Circuit Malfunction
DTC P1120 Accelerator Pedal Position Sensor Circuit Malfunction
CIRCUIT DESCRIPTION
Accelerator pedal position sensor is mounted on the throttle body and it have the 2 sensors to detects the accelerator position and a malfunction of
the accelerator position's own.
The accelerator pedal position sensor is connected with the accelerator pedal by the accelerator wire and the voltage applied to the terminals VPA
and VPA2 of the ECM changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal.
The ECM judges the current opening angle of the accelerator pedal from these signals input from terminals VPA and VPA2 and the ECM controls
the throttle motor based on these signals.
If this DTC is stored, the ECM shuts down the power for the throttle motor and the electromagnetic clutch, and the throttle valve is fully closed by
the return spring.
However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable.
DETECTING CONDITIONS
HINT: After confirming DTC P1120 use the OBD II scan tool or TOYOTA hand-held tester to confirm the throttle valve opening percentage.
