Accelerator Pedal Position Sensor

Accelerator Pedal Position (APP) sensor is part of electronic throttle control system. Instead of cable linking accelerator pedal to throttle butterfly, APP sensor sends desired throttle position to ECM. ECM then commands throttle motor to move butterfly to specified position. APP system incorporates 2 independent potentiometers. One is redundant in order to diagnose and, if necessary, act as back-up to first APP sensor. APP sensors No. 1 and No. 2 are serviced as a single unit. APP sensor communicates desired vehicle speed to ECM when cruise control system is engaged.