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Home >> Mazda >> 1977 >> GLC Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Deceleration Control System >> Testing >> Coasting Richer System >> 1975 Models & 1976-77 Federal 1600cc Man. Trans. Equipped Models (Vehicle Speed Switch Test)

1975 Models & 1976-77 Federal 1600cc Man. Trans. Equipped Models (Vehicle Speed Switch Test)

  1. Unplug vehicle speed switch connector. Insert jumper wire between accelerator switch connector terminals.
  2. Block front wheels, raise rear of vehicle, and support with safety stands. Start engine and accelerate to 20 MPH. With voltmeter connected, current should start to flow between 16-20 MPH and continue to flow at higher speeds.
  3. Slowly decrease vehicle speed. Current should stop within 3 MPH of initial current speed. If not, replace speed switch (in speedometer).
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