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Home >> Toyota >> 1978 >> Corolla Base, 4D Sedan, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Throttle Positioner System >> Testing >> Throttle Positioner System >> 1978 Models

1978 Models

  1. Warm engine to normal operating temperature. Check and adjust idle speed if required. Allow engine to idle and note that throttle positioner diaphragm releases throttle. Disconnect vacuum hose from throttle positioner diaphragm.
  2. Increase engine speed and quickly release throttle. Throttle positioner should now be set. Check engine speed. Engine speed should be as specified in THROTTLE POSITIONER SET SPEED table.
  3. If speed is not as specified, correct by turning throttle positioner adjusting screw near throttle valve. On Cressida, correct speed by turning adjusting nut near throttle positioner diaphragm.
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