1986 Mazda 323 BaseFACTORY OEM SERVICE PROCEDURE

Throttle Position Sensor

A contact-type throttle position sensor is installed on the throttle chamber of all models. It converts throttle position into electrical signals to inform ECU of throttle position. Signals are sent to ECU when throttle is fully open or at idle. SeeFig 1 . The potentiometer prevents loss of power during sudden acceleration or deceleration by signaling the ECU of necessary fuel enrichment requirements.

Fig 1: Contact-Type Throttle Position Sensor
G34501
Factory Service Tools

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When to See a Mechanic

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

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

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