Circuit Description

The accelerator pedal position sensor is a dual variable resistor sensor that monitors throttle opening and accelerator pedal position. The 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 is out of tolerance for 2 seconds. Possible causes are:

• Accelerator pedal sensor.
• ECM.