1981 Honda Prelude Automatic TransFACTORY OEM SERVICE PROCEDURE

Speed Sensor

The speed sensor is a photo cell mounted in the speedometer head. The speed sensor provides a "ON" signal above 15 MPH and a "OFF" signal below 15 MPH.

Fig 1: Throttle Control System Speed Sensor
G09313902Courtesy of AMERICAN HONDA MOTOR CO., INC.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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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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