Throttle Position Sensor: Description and Operation

1987 Dodge Shadow L4-135 2.2L SOHC TurboSECTION Description and Operation

The TPS, located on the throttle body, is an electric resistor which is activated by the movement of the throttle shaft. The sensor produces a voltage which increases or decreases according to the throttle valve opening. The voltage signal is transmitted to the logic module or SMEC where it is used with data from other sensors to adjust the air/fuel mixture accordingly.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.