TownAndCountry 2008

Accelerator Pedal Position Sensor

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Operation



Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

The Accelerator Pedal Position (APP) Sensor is a Linear Potentiometer that monitors the accelerator pedal position. The APP Sensor operates within a 5 volt DC reference range, and provides a linear input signal to the Powertrain Control Module (PCM). The PCM uses data from the APP Sensor to calculate air-fuel mixture, ignition timing, fuel injector pulse width, and transmission/transaxle gear position.

Removal & Installation



Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect and isolate the negative battery cable at the battery.
  4.  
  5. Disconnect the electrical connector from the pedal assembly.
  6.  
  7. Remove the accelerator pedal mounting bolts (1).
  8.  
  9. Remove the accelerator pedal assembly (2).
  10.  

To install:

  1. Install the accelerator pedal assembly (2) to the pedal module.
  2.  
  3. Install the accelerator pedal mounting bolts (1) and tighten to 106 inch lbs. (12 Nm).
  4.  
  5. Connect the electrical connector.
  6.  
  7. Connect the negative battery cable. Tighten the nut to 40 inch lbs. (5 Nm).
  8.  
  9. Use a scan tool and select the ETC RELEARN function to relearn the APP sensor values.

    Click image to see an enlarged view

    Fig. Accelerator Pedal Position (APP) sensor location

  10.  

Testing



Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009


NOTE
Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

Accelerator Pedal Position Sensor

Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

A properly operating APP Sensor should display a linear -sweep- of the entire accelerator pedal range, and should not exhibit any voltage drop or signal break. If the feedback signal is not within the specified range, additional diagnosis is required in order to determine the proper function of the APP Sensor, or if a fault exists in any related sub-systems.

Click image to see an enlarged view

Fig. APP Sensor Range Chart

Accelerator Pedal Position Sensor Strategy

Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

The APP Sensor provides a linear input signal to the Powertrain Control Module (PCM), which is used to monitor the throttle position. The APP Sensor monitors the entire range of throttle opening from 0.5 volts DC (0 percent) 4.5 volts DC (100 percent). In modern drive-by-wire throttle control systems, the APP Sensor provides data to the PCM in order to calculate the desired throttle position, in addition to air-fuel mixture, ignition timing, fuel injector pulse width, and transmission/transaxle gear position.

The APP Sensor utilizes positive coefficient logic: as the accelerator position is increased, the voltage is increased.

Connection & Wiring Diagnosis

Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

Many intermittent open or short circuits may be caused by wiring harness and connector movement due to vibration, engine torque, bumps and rough pavement, etc.

  1. Test the wiring harness and connectors by performing the following tests:

    Move the related connectors and wiring while monitoring the appropriate scan tool data.  
     
    Move the related connectors and wiring with the component commanded ON and OFF. Using a suitable the scan tool, observe the component operation.
     
    With the engine running, move the related connectors and wiring while monitoring component operation.
     
    If harness or connector movement affects the data displayed, the component and system operation, or the engine operation, inspect and repair the harness or connections as necessary.
     

  2.  
  3. Test the connector terminal pins and/or wiring by performing the following tests:

    Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body.  
     
    Inspect for improperly formed or damaged terminals and test for incorrect terminal tension.  
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.  
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and/or brittle sections of wire in the suspect circuits.  
     
    Inspect for wires that are broken inside the insulation by gently pulling on suspect sections of wiring.
     

  4.  

Related Diagnostic Trouble Codes

Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

 
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