LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1987 >> Civic DX, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Air Jet Control System >> Component Testing >> Speed Sensor
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Speed Sensor

  1. Raise and support front of vehicle. Set parking brake and block rear wheels. Insert voltmeter or test light positive probe to Yellow/Black wire terminal at control unit connector.
  2. Connect negative probe to ground. Start engine and place vehicle in 2nd position (gear selector in "2" position for auto. trans.) and accelerate slowly. Battery voltage should be as shown in SPEED SENSOR VOLTAGE CHECK table.
    SPEED SENSOR VOLTAGE CHECK

    Speed Voltage
    Below 6 MPH Yes
    Above 12 MPH No
  3. If voltmeter readings do not correspond to above MPH ranges, install new speed sensor and retest. If no voltage was present during step 2), check for bad electrical connection, fuse or faulty speed sensor. Replace or repair as necessary and retest.
scientia non olet · About LEMON Manuals