Jeep Wrangler/YJ 1987-1995 Repair Guide

Throttle Position Sensor (TPS)

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ADJUSTMENT



With Manual Transmission

See Figure 1



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Fig. Fig. 1: TPS adjustment-manual transmission

  1. Turn the ignition key ON .
  2.  
  3. Check the sensor input voltage. Connect the negative lead of a voltmeter to sensor terminal B , then connect the voltmeter positive lead to sensor terminal C .
  4.  

Do not unplug the sensor wire harness connector. Insert the voltmeter test leads through the back of the wire harness connector to make contact with the sensor terminals during testing. It may be necessary to remove the throttle body from the intake manifold to gain access to the wire harness connector.

  1. Move and hold the throttle plate in the wide-open position. Make sure the throttle linkage contacts the stop.
  2.  
  3. Note the voltmeter reading. Input voltage at terminals B and C should be 5.0 volts at wide open throttle.
  4.  
  5. Return the throttle plate to the closed position.
  6.  
  7. Check the sensor output voltage. Disconnect the voltmeter positive lead from sensor terminal C and connect it to terminal A .
  8.  
  9. Move and hold the throttle plate in the wide open position. Make sure the throttle linkage contacts the stop.
  10.  
  11. Note the voltmeter reading. Output voltage should be 4.6-4.7 volts. Adjust the output voltage by loosening the lower sensor retaining screw and pivoting the sensor in the adjustment slot for coarse adjustment. Loosen the other retaining screw and pivot the sensor for fine adjustment.
  12.  
  13. Remove the voltmeter and return the throttle plate to the closed position. Make sure the sensor retaining screws are tightened securely.
  14.  
  15. If removed, install the throttle body.
  16.  

With Automatic Transmission

See Figure 2



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Fig. Fig. 2: TPS adjustment-automatic transmission

Use the four terminal connector to adjust the TPS. The terminals are marked A, B, C and D on the connector.

  1. Turn the ignition key ON .
  2.  
  3. Check the sensor input voltage. Connect the negative lead of a voltmeter to the back of sensor terminal D , then connect the voltmeter positive lead to the back of sensor terminal A .
  4.  

Do not unplug the sensor wire harness connector. Insert the voltmeter test leads through the back of the wire harness connector to make contact with the sensor terminals during testing. It may be necessary to remove the throttle body from the intake manifold to gain access to the wire harness connector.

  1. Note the input voltage reading at terminals D and A .
  2.  
  3. Check the sensor output voltage. Disconnect the voltmeter positive lead from sensor terminal A and connect it to terminal B .
  4.  
  5. Note the sensor output voltage across terminals B and D .
  6.  
  7. Divide the output voltage reading by the input voltage reading. The desired ratio should be .925 to .935. EXAMPLE: if the input voltage is 5 volts and the output voltage is 4.65 volts; divide 4.65 by 5 and the answer would be .93 or 93%.
  8.  
  9. Adjust the TPS until the correct ratio is obtained. To adjust input and output voltage loosen the sensor top retaining screw for a large adjustment or loosen the bottom retaining screw then pivot the sensor for fine adjustment.
  10.  
  11. Remove the voltmeter. Make sure the sensor retaining screws are tightened securely.
  12.  
  13. If removed, install the throttle body.
  14.  

REMOVAL & INSTALLATION



See Figure 3



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Fig. Fig. 3: TPS replacement

  1. Remove the upper and lower air cleaner assemblies.
  2.  
  3. Remove the throttle body assembly from the vehicle.
  4.  
  5. Remove the two Torx® head retaining screws holding the TPS assembly to the throttle body.
  6.  
  7. Remove the throttle position sensor from the throttle shaft lever.
  8.  
  9. Installation is the reverse of removal.
  10.  

 
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