LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1981 >> Prelude Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Throttle Control System >> Testing >> Speed Sensor Check >> All Models (Engine Hot)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

All Models (Engine Hot)

  1. Jack up front of car and support with safety stands. Block rear wheels and set parking brake.
  2. Connect voltmeter positive probe to yellow/black wire terminal at control box connector. Connect negative probe to a suitable ground.
  3. Start engine. Select second gear and accelerate slowly while observing voltmeter.
  4. Voltmeter should show voltage above 15 MPH. Below this speed, no voltage should be shown.
  5. If voltage is present at the wrong speed, replace speed sensor. If no voltage is present, check fuse and related wiring and repair as necessary.
scientia non olet · About LEMON Manuals