Accelerator Position
Sensor (APS) is installed on the accelerator pedal module and detects the
rotation angle of the accelerator pedal. The APS is one of the most
important sensors in engine control system, so it consists of the two
sensors which adapt individual sensor power and ground line. The second
sensor monitors the first sensor and its output voltage is half of the
first one. If the ratio of the sensor 1 and 2 is out of the range
(approximately 1/2), the diagnostic system judges that it is
abnormal.
