Landcruiser AWD V8-4.7L (2UZ-FE) (1998)
Accelerator Pedal Position Sensor: Testing and Inspection
DTC P1121 Accelerator Pedal Position Sensor Range Problem
DTC P1121 Accelerator Pedal Position Sensor Range/Performance Problem
CIRCUIT DESCRIPTION
Accelerator pedal position sensor is mounted on the throttle body and it has 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 VPA 2 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 magnetic 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 CONDITION
INSPECTION PROCEDURE
HINT: Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records the engine conditions when the
malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was running or stopped, the engine warmed up or not, the
air-fuel ratio lean or rich, etc. at the time of the malfunction.