GM Celebrity/Century/Ciera/6000 1982-1996 Repair Guide

Throttle Position Sensor



See Figures 1 and 2

  1. Disconnect the negative battery cable. Remove the air cleaner assembly along with the necessary duct work.
  3. Remove the TPS attaching screws. If the TPS is riveted to the throttle body, it will be necessary to drill out the rivets.
  5. Remove the TPS from the throttle body assembly.

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Fig. Fig. 1: Throttle Position Sensor (TPS) on a Model 300 TBI assembly

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Fig. Fig. 2: Throttle Position Sensor (TPS) on a Model 700 TBI assembly

The throttle position sensor is an electrical component and should not be immersed in any type of liquid solvent or cleaner, as damage may result.

To install:
  1. With the throttle valve closed, install the TPS onto the throttle shaft. Rotate the TPS counterclockwise to align the mounting holes. Install the retaining screws or rivets. Tighten the retaining screws to 18 inch lbs. (2 Nm).
  3. Install the air cleaner assembly and connect the negative battery cable. Perform the TPS output check and adjust the TPS if applicable.


Not all vehicles provide for this adjustment. Generally, newer vehicles don't have adjustable throttle position sensors. If the sensor your car is equipped with does not have slots at the mounting screws, then it's not adjustable.

  1. Remove air cleaner. Disconnect the TPS harness from the TPS.
  3. Using suitable jumper wires, connect a digital voltmeter J-34029-A or equivalent from the TPS connector center terminal B to the outside terminal A. A suitable ALDL scanner can also be used to read the TPS output voltage.
  5. With the ignition ON and the engine stopped, The TPS voltage should be less than 1.25 volts.
  7. If the reading on the TPS is not within the specified range, rotate the TPS until 0.42-0.54 volts are obtained. If this specified voltage cannot be obtained, replace the TPS.
  9. If the voltage reading is correct, remove the voltmeter and jumper wires and reconnect the TPS connector to the sensor. Re-install the air cleaner.