Accelerator Pedal Position Sensor: Description and Operation

Accelerator Pedal Position Sensor

Description

During ignition on conditions the voltages from the two-track accelerator pedal position sensor is monitored. Both tracks are independently monitored for out of range high and low conditions.

If the input voltage to the ECM stays above a defined value for longer than a calibratable period, the high input failure judgement is made. If the input voltage to the ECM stays below a defined value for longer than a calibratable period, the low input failure judgement is made.

Additionally the signals from the two tracks are compared. If the angle obtained from sensor 1 differs from the angle obtained from sensor 2 by more than a defined amount for longer than a calibration period a range / performance failure judgement is made.