Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Throttle Position (TP) Sensor

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OPERATION



Throttle Position (TP) sensors are usually mounted on the side of the throttle body. The sensor detects the throttle valve opening angle. The voltage of terminal connected to the ECM increases in proportion of the opening angle of the throttle valve. When the throttle valve is fully closed, voltage will be low, usually about 0.7 volts. The voltage increases in proportion to the opening angle of the throttle valve and becomes approximately 2.75.2 volts when the throttle valve is fully open. The ECM judges the driving conditions from the input signals of the terminals, and uses them as one of the conditions for computing the air/fuel ratio correction, power increases and fuel cut-off control.

TESTING



1FZ-FE Engine


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Fig. Measure the Throttle Position (TP) sensor resistance1FZ-FE engine

  1. Detach the throttle position sensor connector.
  2.  
  3. Apply vacuum to the throttle opener.
  4.  
  5. Using an ohmmeter, measure the resistance between each terminal.
  6.  
  7. If the resistance is not as specified, replace the throttle position sensor.
  8.  

2RZ-FE and 3RZ-FE Engines


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Fig. Checking the resistance of the Throttle Position (TP) sensor2RZ-FE and 3RZ-FE engines

  1. Detach the Throttle Position (TP) sensor connector.
  2.  
  3. Apply vacuum to the throttle opener.
  4.  
  5. Confirm that the throttle valve is fully closed.
  6.  
  7. Using an ohmmeter, measure the resistance between each terminal.
  8.  
  9. On 2RZ-FE engines, connect an ohmmeter to terminals IDL and E2 . The bottom terminal is E2 , while terminal IDL is positioned directly above it.
    1. Insert a 0.022 in. (0.57mm) thick feeler gauge between the throttle stop screw and lever. Check for continuity between terminals IDL and E2 of the sensor. Resistance should be 2.3 kohms or less.
    2.  
    3. Insert a 0.029 in. (0.74mm) thick feeler gauge between the throttle stop screw and lever. Check for continuity between terminals IDL and E2 of the sensor. No continuity should be present.
    4.  

  10.  
  11. If the resistance is not as specified, replace the throttle position sensor.
  12.  

5VZ-FE and 2UZ-FE Engines


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Fig. Checking the Throttle Position (TP) sensor5VZ-FE and 2UZ-FE engines

  1. Detach the Throttle Position (TP) sensor connector.
  2.  
  3. Apply vacuum to the throttle opener.
  4.  
  5. Using an ohmmeter, measure the resistance between each terminal.
  6.  
  7. Confirm that the throttle valve is fully closed.
  8.  
  9. Connect an ohmmeter to terminals IDL and E2 .
  10.  
  11. On 1997 5VZ-FE engines only:
    1. Insert a 0.013 in. (0.32mm) thick feeler gauge between the throttle stop screw and lever. Check for continuity between terminals VTA and E2 of the sensor. Resistance should be 0.25.7 kohms.
    2.  
    3. Insert a 0.021 in. (0.54mm) thick feeler gauge between the throttle stop screw and lever. Check for continuity between terminals VTA and E2 of the sensor. No continuity should be present.
    4.  

  12.  
  13. On all other model years using the 5VZ-FE engine, simply verify that the throttle valve is either fully closed or fully open to obtain the indicated resistance readings.
  14.  
  15. If the resistance is not as specified, replace the TP sensor.
  16.  

REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the Throttle Position (TP) sensor electrical connector.
  4.  
  5. Loosen the sensor attaching screws and remove the sensor.
  6.  



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Fig. The TP sensor is secured by screws1FZ-FE engine shown, others similar



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Fig. Unplug the throttle position electrical connector



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Fig. Remove the throttle position sensor from the throttle body

To install:

  1. Make sure the tangs to the sensor are in good condition, not bent. Place the sensor on the throttle body.
  2.  
  3. Attach the sensor mounting screws.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Start the engine and check operation.
  8.  

 
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