Checking Accelerator Pedal Position Sensor
The APP sensor is an input to the powertrain control module (PCM) and is used to determine the torque
demand. There are 3 pedal position signals in the sensor. Signal 1, APPS1, has a negative slope
(increasing angle, decreasing voltage) and signals 2 and 3, APPS2 and APPS3, both have a positive slope
(increasing angle, increasing voltage). During normal operation APPS1 is used as the indication of pedal
position by the strategy. The 3 pedal position signals make sure the PCM receives a correct input even if 1
signal has a concern. There are 2 reference voltage circuits and 2 signal return circuits for the sensor. For
additional information, refer to Torque Based Electronic Throttle Control (ETC) in this section.
Testing
- Disconnect the accelerator pedal position sensor connector.
- Using an ohmmeter, measure the resistance between terminal VC and E2.
- Reconnect the accelerator pedal position sensor connector. Resistance should be 1.2-3.2 kohms at 68°F (20°C).
- If the resistance is not as specified, replace the accelerator pedal position sensor.
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