TownAndCountry 2008

Output Shaft Speed Sensor

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Operation



Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

The Output Shaft Speed (OSS) Sensor is a permanent magnet output coil device that monitors the vehicle speed. A reluctor is attached to the transmission/transaxle final drive, and is used to generate a constant signal as it passes the OSS magnetic coil. The OSS Sensor utilizes system voltage (12 volts DC), or reference voltage (5 volts DC) to generate a digital output signal to the PCM that is based upon a 0.5 volt AC reference. The alternating magnetic field is used by the sensor output electronics to produce a generated wave form. The OSS waveform is used by the Powertrain Control Module (PCM) to calculate engine and vehicle load, ignition timing, fuel injector timing and pulse width, fuel cut, and the speedometer display.  

Removal & Installation



4-Speed Transaxle-41TE

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. Raise and safely support the vehicle.
  6.  
  7. Disconnect the output speed sensor connector.
  8.  
  9. Unscrew and remove the output speed sensor (1).
  10.  
  11. Inspect the speed sensor O-ring and replace, if necessary.

    Click image to see an enlarged view

    Fig. Output Shaft Speed (OSS) sensor location-4-speed transaxle (41TE)

  12.  

To install:

  1. Verify the O-ring is installed into position.
  2.  
  3. Install and tighten the output speed sensor (1) to 20 ft. lbs. (27 Nm).
  4.  
  5. Connect the speed sensor connector.
  6.  
  7. Connect the negative battery cable, tighten the nut to 45 inch lbs. (5 Nm).
  8.  

6-Speed Transaxle-62TE

Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Unplug the electrical connector at the output speed sensor (1).
  4.  
  5. Remove the bolt at output speed sensor.
  6.  
  7. Pull up on the output speed sensor to remove.
  8.  

To install:

  1. Install a new O-ring on the output speed sensor.
  2.  
  3. Install the output speed sensor (1) into the transaxle case.
  4.  
  5. Install the bolt at the output speed sensor and tighten to 105 inch lbs. (12 Nm).
  6.  
  7. Engage the electrical connector.

    Click image to see an enlarged view

    Fig. Output Shaft Speed (OSS) sensor location-6-speed transaxle (62TE)

  8.  

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.

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.  

OSS Circuit Testing

Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

Use a suitable scan tool or a Graphing Multi-Meter (GMM) in order to view the OSS data.

OSS Sensor logic is based on alternating lines of magnetic flux which generate an analog signal to the PCM, and are based on the vehicle speed .

Verify that the engine that there is no foreign material obstructing the path between the reluctor and the OSS Sensor. If any engine mechanical faults are evident, locate and repair as required before continuing.

A Digital Volt-Ohm Meter (DVOM) may be used to verify the condition of the wiring: additional information may be acquired by taking measurements at the sensor connector as well as the PCM connector. If significant resistance is measured (greater than 5 ohms), check the wiring harness and connections for corrosion, poor pin connections, or damaged wires.

If all engine wiring and pin connections are confirmed, disconnect the OSS Sensor to verify the signal with a GMM, and verify PCM communication before replacing the OSS Sensor.

Click image to see an enlarged view

Fig. OSS Range Chart

OSS Strategy

Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

The OSS Sensor provides a magnetically generated signal waveform to the Powertrain Control Module (PCM) for a number of engine control, drive train, and information display system calculations. The OSS signal frequency varies according to vehicle speed, and is compared with the Crankshaft Position (CKP) Sensor and Camshaft Position (CMP) Sensor signals for measured operating conditions. The magnetic waveform pattern is used by the Powertrain Control Module (PCM) to calculate engine and vehicle load, ignition timing, fuel injector timing and pulse width, and the speedometer display.

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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