Circuit Description

Accelerator pedal position sensor is a 2 variable resistor sensor that monitors throttle opening and accelerator pedal position sensor malfunction. Accelerator pedal position sensor determines vehicle accelerator pedal position. ECM controls throttle motor and electromagnetic clutch based on signal from accelerator pedal position sensor. If DTC P1121 is set, ECM shuts down power to throttle control motor and electromagnetic clutch.

DTC P1121 is set when ECM consistently detects difference between VPA and VPA2 circuits out of tolerance. Possible cause is; faulty accelerator pedal position sensor.