Quest 1995-1996

Throttle Position Sensor

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Adjustment



Specific to:

Mercury Villager 1993-1995

Nissan Quest 1993-1995

  1. Remove the air cleaner-to-intake manifold hose.
  2.  
  3. With the ignition switch OFF , disconnect the TP sensor electrical connectors.
  4.  
  5. Turn the ignition switch on but leave the engine OFF .
  6.  
  7. Using a voltmeter set to the DC range, connect the negative lead of a voltmeter lead to the negative battery terminal.
  8.  
  9. Connect the positive voltmeter lead to terminal -c- of the TP sensor.
  10.  
  11. Loosen but do not remove the TP sensor screws.
  12.  
  13. Turn the throttle to wide open throttle position and observe the voltmeter reading. The reading should be 4 volts.
  14.  
  15. Allow the throttle to return to the fully closed (idle) position and observe the voltmeter reading. The reading should be 0.4-0.5 volts.
  16.  
  17. Rotate the TP sensor to obtain the specified voltages. If the sensor cannot be adjusted to specifications, replace the sensor and repeat this procedure.
  18.  
  19. Tighten the TP sensor screws to 17-21 inch lbs. (2.0-2.4 Nm).
  20.  
  21. Install the air cleaner-to-intake manifold hose.
  22.  
  23. Connect the TP sensor electrical connectors.
  24.  

Specific to:

Mercury Villager 1996-1998

Nissan Quest 1996-1998

  1. Remove the air cleaner-to-intake manifold hose.
  2.  
  3. With the ignition switch OFF , disconnect the TP sensor electrical connectors.
  4.  
  5. Connect ohmmeter leads between TP sensor terminals -b- and -c- on 1993-95 vehicles, or terminals 2 and 3 on 1996-00 vehicles.
  6.  
  7. Loosen but do not remove the TP sensor screws.
  8.  
  9. Turn the throttle to wide open throttle position and observe the ohmmeter reading. The reading should be approximately 4,000 (4K) ohms.
  10.  
  11. Allow the throttle to return to the fully closed (idle) position and observe the voltmeter reading. The reading should be 400-500 (0.4-0.5 K) ohms.
  12.  
  13. Rotate the TP sensor to obtain the specified resistances. If the sensor cannot be adjusted to specifications, replace the sensor and repeat this procedure.
  14.  
  15. Tighten the TP sensor screws to 17-21 inch lbs. (2.0-2.4 Nm).
  16.  
  17. Install the air cleaner-to-intake manifold hose.
  18.  
  19. Connect the TP sensor electrical connectors.

    Click image to see an enlarged view

    Fig. Ohmmeter connections for TP sensor adjustment-1996-98 vehicles

  20.  

Operation



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

The Throttle Position (TP) sensor responds to accelerator pedal movement. The sensor is a variable resistor (potentiometer) that changes resistance as the throttle plate is moved. The PCM monitors the change of resistance to determine throttle position and throttle opening/closing speed. The TP sensor signal is used by the PCM to adjust various engine functions such as air/fuel mixture and fuel cut-off during deceleration. There is also a wide open and closed throttle switch built into the TP sensor, which does not function as part of the engine control system.

Removal & Installation



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the TP sensor electrical connectors.
  4.  
  5. Remove the TP sensor screws and remove the sensor.
  6.  

To install:

  1. Position the TP sensor on the throttle body.
  2.  
  3. Install the TP sensor screws, but do not tighten them.
  4.  
  5. Adjust the TP sensor. Please refer to the following procedure, Throttle Position Sensor, Adjustment.
  6.  
  7. Tighten the TP sensor screws to 17-21 inch lbs. (2.0-2.4 Nm).
  8.  
  9. Connect the TP sensor electrical connectors.
  10.  
  11. Connect the negative battery cable.

    Click image to see an enlarged view

    Fig. Disconnecting the throttle position sensor electrical connectors

  12.  

Testing



Specific to:

Mercury Villager 1993-1998

Nissan Quest 1993-1998

  1. With the ignition switch OFF , disconnect the TP sensor electrical connector.
  2.  
  3. Connect ohmmeter leads between TP sensor terminals -b- and -c- on 1993-95 vehicles, or terminals 2 and 3 on 1996-98 vehicles.
  4.  
  5. Compare the resistance readings at various throttle positions with those in the accompanying charts.
  6.  
  7. If the resistances are not within specifications, adjust the TP sensor. Please refer to the following procedure, Throttle Position Sensor, Adjustment. If the sensor cannot be adjusted to specifications, replace the sensor.

    Click image to see an enlarged view

    Fig. Ohmmeter connections for TP sensor testing-1993-95 vehicles



    Click image to see an enlarged view

    Fig. Testing throttle position sensor resistance



    Click image to see an enlarged view

    Fig. TP sensor resistance-to-throttle position specifications-1993-95 vehicles



    Click image to see an enlarged view

    Fig. Ohmmeter connections for TP sensor testing-1996-98 vehicles



    Click image to see an enlarged view

    Fig. TP sensor resistance-to-throttle position specifications-1996-98 vehicles

  8.  

 
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