Nissan Pick-ups and Pathfinder 1989-1995

Throttle Position Sensor

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OPERATION



This sensor is a potentiometer directly attached to the throttle plate shaft. It signals not only throttle position but also opening and closing speed. The ECU uses this information for controlling injection and ignition. Normally, the ECU relays on a switch built into the sensor to read throttle-closed position. If this hard idle switch fails, the potentiometer signal is used and a trouble code will be set. If the unit is removed, it must be adjusted so that the idle switch is closed when the throttle is closed.

REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Remove the the throttle sensor mounting screws, then remove the sensor from the engine.
  4.  
  5. If the throttle sensor is replaced or removed, it will be necessary to install it in the correct position and adjust it, for proper operation. Refer to the adjustment procedure later in this section.
  6.  

ADJUSTMENT



See Figures 1 and 2

KA24E Engine
  1. When the throttle sensor has been removed or replaced, reinstall it in the throttle chamber, but do not tighten the bolts.
  2.  
  3. Engage the sensor harness connector, then start the engine. Run the engine until it is warm.
  4.  
  5. Measure the output voltage of the sensor using a voltmeter. Connect the voltmeter to the TPS sensor harness connector. Rotate the body of the sensor until the voltage is 0.4-0.6 volts, then tighten the bolts.
  6.  
  7. Separate the harness connector for a few seconds, then reconnect it.
  8.  
  9. Start engine and check for proper operation.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Throttle sensor connector position-KA24E engine



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Fig. Fig. 2: Throttle sensor connector position-VG30E engine

VG30E Engine
  1. When the throttle sensor has been removed or replaced, reinstall it in the throttle chamber, but do not tighten the bolts.
  2.  
  3. Connect the throttle sensor and throttle wire switch harnesses.
  4.  
  5. Disengage the Auxiliary Air Control (AAC) valve sub-harness connector.
  6.  
  7. Disconnect the throttle valve switch harness.
  8.  
  9. While closing the valve manually, check the OFF-ON speed with a circuit tester. The throttle valve switch OFF-ON speed specifications are as follows:

    Manual transmission idle speed-100-400 rpm
     
    Automatic transmission idle speed (in N position) -100-400 rpm
     

  10.  
  11. If not within specifications, rotate the sensor body to achieve the proper speed.
  12.  
  13. Tighten the sensor bolts so that the sensor does not move.
  14.  

 
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