The Accelerator Pedal Position Sensor (APPS) is a linear potentiometer. It provides the Powertrain Control Module (PCM) with a DC voltage signal proportional to the angle, or position of the accelerator pedal. The APPS signal is translated (along with other sensors) to place the throttle plate (within the throttle body) to a pre-determined position.
Removal & Installation
3.7L & 4.7L Engines
- Disconnect the negative battery cable.
- Remove the drivers side lower dash board close out panel.
- Disconnect the APP electrical connector.
Remove the accelerator pedal assembly fasteners and the accelerator pedal assembly.
- Connect the accelerator pedal position sensor wiring harness connector to the sensor.
- Position the accelerator pedal assembly and install the fasteners.
- Install the drivers lower dash board close out panel.
- Connect the negative battery cable.
- Disconnect the Accelerator Pedal Position (APP) sensor electrical connector.
- Remove the two accelerator pedal assembly bracket nuts and remove the pedal assembly.
- Remove the three sensor-to-pedal nuts and remove the APP sensor.
- Install APP sensor to pedal assembly and install three nuts.
- Place accelerator pedal assembly over two mounting studs.
- Install and tighten two mounting nuts.
- Install electrical connector to the APP sensor.
- Use a scan tool may to learn electrical parameters. Go to the Miscellaneous menu, and then select ETC Learn.
- If the previous step is not performed, a Diagnostic Trouble Code (DTC) will be set.
- If necessary, also use a scan tool to erase any Diagnostic Trouble Codes (DTC's) from PCM.
- Before starting engine, operate accelerator pedal to check for any binding.
- Using a diagnostic scan tool, check for the presence of any Diagnostic Trouble Codes (DTCs). Record and address these codes as necessary.
- With the Ignition On, and the Engine Not Running, use a scan tool, under Transmission Sensors, monitor the Throttle Position Sensor (TPS) voltage in the following step. Slowly open and close the throttle while checking for erratic voltage changes. If equipped with ETC, use the ETC Throttle Follower test in the scan tool to check for erratic voltage changes. If the TPS voltage change was not smooth and constant, replace the TPS.
- Inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors while checking for shorted and open circuits. With the scan tool, check the DTC EVENT DATA to help identify the conditions in which the DTC was set.