GM Camaro/Firebird 1993-1998 Repair Guide

Throttle Position (TP) Sensor

Print

OPERATION



The TP sensor is mounted to the throttle body, opposite the throttle lever and is connected to the throttle shaft. Its function is to sense the current throttle valve position and relay that information to the PCM. Throttle position information allows the PCM to generate the required injector control signals. The TP sensor consists of a potentiometer which alters the flow of voltage according to the position of a wiper on the variable resistor windings, in proportion to the movement of the throttle shaft.

TESTING



See Figure 1

  1. Visually check the connector, making sure it is connected properly and all of the terminals are straight, tight and free of corrosion.
  2.  
  3. With the ignition in the ON position, check the voltage at terminal C. The voltage should read less that 0.5 volts.
  4.  
  5. Operate the throttle, while watching the voltage. The voltage should increase smoothly to 5 volts as the throttle is opened.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Throttle Position (TP) sensor circuit

  1. If the voltage is not within specification, check the 5 volt reference signal circuit at terminal A and ground the circuit at terminal B for the proper signal. If the correct signal is found, the sensor is faulty. If the proper signal is not found, check the circuits back to the computer control module for continuity.
  2.  
  3. If the circuits are functional, the PCM may be faulty.
  4.  

REMOVAL & INSTALLATION



See Figures 2 through 10

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the TPS electrical connector.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: On the 3.8L engine, detach the connector (1) from the TP sensor (2) ...



Click image to see an enlarged view

Fig. Fig. 3: ... then unfasten the retaining screws and remove the TP sensor

  1. Remove the mounting screws.
  2.  
  3. Remove the TPS and, if equipped, sensor seal from the throttle body.
  4.  



Click image to see an enlarged view

Fig. Fig. 4: To remove the TP sensor on the 5.7L engine, unplug the sensor connector



Click image to see an enlarged view

Fig. Fig. 5: Unfasten the TP sensor retaining screws ...



Click image to see an enlarged view

Fig. Fig. 6: ... then remove the TP sensor from the throttle body



Click image to see an enlarged view

Fig. Fig. 7: Location of the TP sensor-3.4L engine



Click image to see an enlarged view

Fig. Fig. 8: Throttle Position (TP) sensor mounting-3.8L engine



Click image to see an enlarged view

Fig. Fig. 9: The TP sensor is mounted to the side of the throttle body-1993-97 5.7L engine



Click image to see an enlarged view

Fig. Fig. 10: Exploded view of the TP sensor (6) and related components-1998 5.7L engine

To install:
  1. Place the TP sensor in position. Align the TP sensor lever with the sensor drive lever on the throttle body.
  2.  
  3. Install the TP sensor mounting screws and tighten to 18 inch lbs. (2 Nm).
  4.  
  5. Attach the electrical connector.
  6.  
  7. Connect the negative battery cable.
  8.  

 
label.common.footer.alt.autozoneLogo