LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1985 >> Prelude Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Spark Control System >> Component Testing >> Speed Sensor >> A/T Models
April 5, 2026: LEMON Manuals is launched! Read the announcement.

A/T Models

  1. Raise and support front of vehicle. Push voltmeter or test light positive probe into Yellow/Black wire terminal at the control unit connector.
  2. Connect negative probe to ground. Start engine. Place vehicle in second position (gear selector in "2" position) and accelerate slowly. Battery voltage should be as shown in SPEED SENSOR VOLTAGE CHECK table.
    SPEED SENSOR VOLTAGE CHECK

    Speed Voltage
    Below 11 MPH Yes
    Above 16 MPH No
  3. If voltmeter readings do not correspond to above MPH ranges, install a new speed sensor and retest. If there was no voltage during test, check for bad electrical connection, fuse or faulty speed sensor. Replace or repair as necessary and retest.
scientia non olet · About LEMON Manuals