Description & Operation
The Accelerator Pedal Position Sensor (APPS) assembly is located under the vehicle battery tray. A cable connects the assembly to the accelerator pedal. A plastic cover with a movable door is used to cover the assembly.
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.
A mechanical cable is used between the accelerator pedal and the APPS assembly. Although a cable is used between the pedal and APPS, a mechanical cable is not used at the throttle body. Throttle plate position is electrically determined.
Removal & Installation
The APPS is serviced (replaced) as one assembly including the sensor, plastic housing and cable. The APPS assembly is located under the vehicle battery tray. Access to APPS is gained from over top of left / front tire.
- Disconnect negative battery cable at battery.
- Disconnect APPS cable at accelerator pedal.
- Remove wheel house liner at left / front wheel.
- Gain access to APPS electrical connector by opening swing-down door.
- Disconnect electrical connector.
- Remove 3 mounting bolts.
- Remove APPS assembly from battery tray.
- If cable is to be separated at APPS, unsnap cable clip from ball socket. Release cable from plastic housing by pressing on small cable release tab.
- Install Accelerator Pedal Position Sensor (APPS) cable to accelerator pedal. Refer to Accelerator Pedal Removal / Installation.
- Connect electrical connector to APPS.
- If necessary, connect cable to APPS lever ball socket (snaps on).
- Snap APPS cable cover closed.
- Position APPS assembly to bottom of battery tray and install 3 bolts.
- Install wheelhouse liner.
The 5.7L V-8 engine is equipped with a fully electronic accelerator pedal position sensor. If equipped with a 5.7L, also perform the following 3 steps:
- Connect negative battery cable to battery.
- Turn ignition switch ON, but do not crank engine.
Leave ignition switch ON for a minimum of 10 seconds. This will allow PCM to learn electrical parameters.
NOTEThe DRB III Scan Tool may also be used 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, use a proper scan tool to erase any Diagnostic Trouble Codes (DTCs) from PCM.