9-3 1999

Throttle Body Assembly

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Location





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Fig. Throttle position sensor location-1998-2002 2.0L engine



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Fig. Throttle position sensor location-2003-2005 2.0L engine



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Fig. Throttle position sensor location-2.3L engine



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Fig. Throttle position sensor location-3.0L engine

Operation



The Throttle Position Sensor (TPS) is a Linear Potentiometer that monitors the throttle position. The TPS 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 TPS to calculate air-fuel mixture, ignition timing, fuel injector pulse width, and transmission/transaxle gear position.

Removal & Installation



2.0L Engine
  1. Before servicing the vehicle, refer to the precautions.
  2.  
  3. Turn the ignition to the OFF position.
  4.  
  5. Remove the top engine cover.
  6.  
  7. Undo the coolant expansion tank cap to release any pressure and then retighten it.
  8.  
  9. Undo the connector to the pressure/temperature sensor. Remove the turbo delivery pipe complete with bypass pipe and bypass valve.
  10.  
  11. On vehicle equipped with manual transmission, undo the venturi hose from the charge air pipe.
  12.  
  13. Remove the cover on the throttle body pedal arm.
  14.  
  15. Detach the hose for the bypass valve.
  16.  
  17. Detach the accelerator pedal wire from the throttle body pedal arm.
  18.  
  19. Remove the rubber seal and undo the limp-home solenoid connector.
  20.  
  21. Unplug the throttle body 10-pin connector.
  22.  
  23. Undo the 3 throttle body retaining screws.
  24.  
  25. Lift up the throttle body, clamp and detach the 2 coolant hoses to the throttle body and detach the hose under the limp-home solenoid.
  26.  
  27. Detach the lower vacuum hose.

    Click image to see an enlarged view

    Fig. Throttle position sensor location

  28.  

To install:

  1. Installation is the reverse of removal.
  2.  
  3. Position the throttle body and screw it on with the 3 retaining screws. Fit a new seal if necessary and lubricate it with a thin coat of Vaseline.
  4.  
  5. Spray the throttle body 10-pin connector with Kontakt 61 and plug it in.
  6.  
  7. Spray the limp-home solenoid connector with Kontakt 61. Plug in the connector and fit the rubber seal.
  8.  
  9. The limp-home solenoid will be activated when the ignition is turned on. The limp-home mechanism must therefore be reset after turning on the ignition.
  10.  

2.3L Engine

The throttle position sensor is an integral part of the throttle body actuator.

  1. Before servicing the vehicle, refer to the precautions.
    WARNING
    The limp-home solenoid will be activated when the ignition is turned on. The limp-home mechanism must therefore be reset after turning on the ignition.

  2.  
  3. Turn the ignition to the OFF position.
  4.  
  5. Remove the upper engine cover.
  6.  
  7. Undo the coolant expansion tank cap to release any pressure and then retighten it.
  8.  
  9. Remove the cover on the throttle body pedal arm.
  10.  
  11. Pinch together the 2 coolant hoses to the throttle body.
  12.  
  13. Undo the charge air bypass valve hose and the two preheating hoses.
  14.  
  15. Detach the lower vacuum hose.
  16.  
  17. Undo the turbocharger delivery pipe retaining screw in the cylinder head.
  18.  
  19. Undo the hose clip and carefully tilt up the turbocharger delivery pipe.
  20.  
  21. Detach the accelerator pedal wire from the throttle body pedal arm.
  22.  
  23. Lift off the rubber seal and unplug the limp-home solenoid connector.
  24.  
  25. Unplug the throttle body 10-pin connector.
  26.  
  27. Undo the 3 throttle body retaining screws.
  28.  
  29. Lift up the throttle body and detach the hose under the limp-home solenoid.

    Click image to see an enlarged view

    Fig. Throttle position sensor location

  30.  

To install:

  1. Position the throttle body and screw it on with the 3 retaining screws. Install a new seal if necessary and lubricate it with a thin coat of Vaseline.
  2.  
  3. Install the hose under the limp home solenoid and install the clip.
  4.  
  5. Tighten the 3 throttle body retaining screws. Tighten to 7 ft. lbs. (10 Nm).
  6.  
  7. Spray the throttle body 10-pin connector with Kontakt 61 and plug it in.
  8.  
  9. Spray the limp-home solenoid connector with Kontakt 61. Plug in the connector and install the rubber seal.
  10.  
  11. Fasten the accelerator pedal wire to the throttle body pedal arm.
  12.  
  13. Install the lower vacuum hose.
  14.  
  15. Install the charge air bypass valve hose and the two preheating hoses.
  16.  
  17. Remove the clips on the two coolant hoses to the throttle body.
  18.  
  19. Install the cover on the throttle body pedal arm.
  20.  
  21. Start the engine and make sure all the connections are tight. Top up with coolant as necessary.
  22.  
  23. Attach female connector for throttle.
  24.  
  25. Turn the ignition ON .
  26.  
  27. Clear diagnostic trouble codes.
  28.  
  29. Turn the ignition OFF .
  30.  
  31. Carefully slide the end of the spring towards the throttle body using the point of a pen or similar.
  32.  
  33. At the same time, rotate the black tooth disc anticlockwise with a screwdriver. A click will be heard in its end position.
  34.  
  35. Turn the pedal arm with throttle cable clockwise. Make sure that the throttle arm does not follow the movement of the pedal arm. Refer to the illustration of a reset throttle.
  36.  
  37. Reinstall the engine cover.
  38.  

Testing



Connection & Wiring Diagnosis

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


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Fig. Related Diagnostic Trouble Codes

Throttle Position Sensor

A properly operating TPS should display a linear -sweep- of the entire throttle 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 TPS, or if a fault exists in any related sub-systems.

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Fig. Figure 1: Throttle Position Sensor Range Chart

Throttle Position Sensor Strategy

The TPS provides a linear input signal (See Figure 1) to the Powertrain Control Module (PCM), which is used to monitor the throttle position. The TPS monitors the entire range of throttle opening from 0.5 volts DC (0%) 4.5 volts DC (100%). In modern drive-by-wire throttle control systems, the TPS 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 TPS utilizes positive coefficient logic: as the accelerator position is increased, the voltage is increased.

 
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