Description & Operation: Description
Accelerator Position Sensor (APS), installed on the accelerator pedal module, detects the rotation angle of the accelerator pedal. The APS, one of the most important sensors in engine control system, consists of two sensors each equipped with individual sensor power and ground lines. 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.