PROCEDURE
INSPECT INTAKE MANIFOLD
Inspect the diaphragm.
Using a vacuum pump, apply a vacuum of 60 kPa (450 mmHg, 17.7 in.Hg) or higher to the diaphragm chamber. Check that there is no change in vacuum after 1 minute.
After applying vacuum in the step above, check that the actuator rod operates.
If the result is not as specified, replace the intake manifold.