Circuit Description

APP sensor is located on throttle body and has 2 variable resistors integral to APP sensor. APP sensor monitors accelerator position and is connected with the accelerator pedal by the accelerator wire. APP sensor signal voltage (0-5 volts) to ECM changes in proportion to accelerator pedal opening angle. ECM turns off power to throttle motor based on APP sensor voltage signals. DTC is set when ECM detects voltage is out of range on VPA circuit or VPA2 circuit. Possible cause is:

• Defective APP sensor.