Pontiac Fiero 1984-1988 Repair Guide

Throttle Position Sensor (TPS)

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The TPS is mounted on the side of the throttle body opposite the throttle lever assembly. The function of the TPS is to relay throttle valve position to the Electronic Control Module (ECM). The signal is needed to generate the proper injector controls (base pulse).

REMOVAL & INSTALLATION



Throttle Body Injection
  1. Disconnect the negative (-) battery cable.
  2.  
  3. Remove the air cleaner assembly.
  4.  
  5. Remove the electrical connector from the TP sensor.
  6.  
  7. Remove the two attaching screws and remove the sensor.
  8.  

The throttle position sensor TPS is an electrical component and should not be immersed in any type of liquid solvent or cleaner.

To install:

  1. Position the TPS unit on the throttle body with the throttle valve normally closed. Install the sensor and rotate counter clockwise to align the mounting holes. Torque the two attaching screws to 18 inch lb. (2.0 Nm).
  2.  
  3. Connect the TPS electrical connector. Reconnect the negative (-) battery cable.
  4.  

Multi-Port Injection
  1. Disconnect the negative (-) battery cable.
  2.  
  3. Remove the air duct assembly.
  4.  
  5. Remove the electrical connector from the TP sensor.
  6.  
  7. Remove the two attaching screws and remove the sensor.
  8.  

The throttle position sensor TPS is an electrical component and should not be immersed in any type of liquid solvent or cleaner.

To install:

  1. Position the TPS unit on the throttle body with the throttle valve normally closed. Install the sensor and rotate counter clockwise to align the mounting holes. Torque the two attaching screws to 18 inch lb. (2.0 Nm).
  2.  
  3. Connect the TPS electrical connector. Reconnect the negative (-) battery cable.
  4.  
  5. Reconnect the negative battery cable. Start the engine and check for proper operation.
  6.  

ADJUSTMENT



1984-86 Model 300 Only


Click image to see an enlarged view

Fig. Fig. 1 Connect the multimeter to the terminals indicated

  1. Connect a tachometer and check the idle speed to see if it is within specifications on the underhood sticker. If not within specifications, refer to the "Idle Speed Adjustment" procedures in .
  2.  
  3. Remove the air cleaner and disconnect the TPS electrical connector.
  4.  
  5. Using three, six inch jumper wires, connect the TPS harness to the TPS as shown in the illustration.
  6.  
  7. Turn the ignition switch to the ON position with the engine NOT running. Measure the voltage between terminals B and C using a digital voltmeter.
  8.  
  9. The voltage should read 0.450-1.250 volts at closed throttle position.
  10.  
  11. Turn the ignition switch to the OFF position and reconnect the TPS electrical connector without the jumper wires.
  12.  

 
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