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Throttle Positioner: Corolla

  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 blade.
  2. Disconnect vacuum hose from throttle positioner diaphragm. Throttle positioner should now be set. With throttle positioner activated, engine speed should be 1400 RPM. If not, correct by turning throttle positioner adjusting screw. Reconnect vacuum hose and see that engine returns to idle within 1-3 seconds.
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