The accelerator pedal contains 2 individual Accelerator Pedal Position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits:
The APP sensors are used to determine the pedal angle. The Powertrain Control Module (PCM) provides each APP sensor with a 5-volt reference circuit and a low reference circuit. The APP sensors provide the PCM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is near the low reference and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position is near the 5-volt reference and decreases as the pedal is actuated.
Removal & Installation
- Before servicing the vehicle, refer to the Precautions Section.
- Disconnect the Connector Position Assurance (CPA) from the Accelerator Pedal Position (APP) sensor connector.
Disconnect the APP sensor harness connector.
NOTEDue to clearance issues, the upper attachment bolt cannot be removed from the accelerator pedal assembly. Loosen the bolt completely and leave the bolt in the component until the assembly is removed from the vehicle.
NOTEA speed wrench may be used to aid in the removal and installation.
- Remove the APP assembly attachment bolts to the brake pedal assembly.
- Remove the APP assembly from the vehicle.
- Install the upper attachment bolt into the APP assembly.
- Install the APP assembly into the vehicle.
- Install the attachment bolts into the APP assembly. Tighten the accelerator pedal position assembly-to-brake bracket bolt to 18 ft. lbs. (25 Nm).
- Connect the APP sensor harness connector. Push the connector in until the lock position is felt, then pull back to confirm engagement.
- Install the APP sensor and connect the CPA.
Before beginning vehicle diagnosis, the following preliminary inspections/tests must be performed:
Ensure that the battery is fully charged
- Install a scan tool. Verify that the scan tool powers up.
- With the ignition ON, engine OFF, verify communication with all of the control modules on the vehicle.
- With the ignition ON, observe the scan tool APP sensor 1 voltage parameter. The readings should be 1.0 volt at rest to just above 4.0 volts when fully depressed. Ensure there is a voltage change with accelerator pedal movement.
- With the ignition ON, observe the scan tool APP sensor 2 voltage parameter. The readings should be 0.5 volts at rest to more than 2.0 volts with the accelerator pedal fully depressed. Ensure there is a voltage change with accelerator pedal movement.
- Connect a fused jumper wire between the APP sensor 2 5-volt reference circuit and the APP sensor 2 signal circuit at the accelerator pedal harness connector.
- Observe the APP sensor 2 voltage parameter with a scan tool. It should read 4.6-5.2 volts.
- Turn OFF the ignition. Remove the fused jumper.
- Turn ON the ignition, with the engine OFF.
- Measure the voltage of the APP sensor 5-volt reference circuit with a DMM. It should read 4.6-5.2 volts.
- If the reference voltage is below the acceptable range, check the low reference circuit for an open or high resistance interruption.
If all circuits are functioning properly and there is no voltage change when the accelerator pedal is moved, replace the APP.