Celica Supra and Cressida
With engine idling and coolant temperature less than 122°F (50°C), connect a vacuum gauge to hose at distributor sub-diaphragm. Gauge should show high vacuum. If not, check BVSV or check valve. When engine is warm, gauge should read low vacuum. If not, check BVSV. Apply vacuum to both distributor diaphragms and check for proper movement.