Toyota 4Y 2006 Manual page 31

2. When the engine is stopped, disconnect the vacuum hose
connector from the distributor and apply vacuum to a
diaphragm to check that the vacuum advancer is working
smoothly, Inspect the return condition as well.
[Point 31
Check governor controller function
1. Connect a timing light. When the engine speed is gradually
increased from idle, there should be an advance.
Note:
If this inspection is as it should be, omit the inspection in 2.
2.
With the engine stopped, remove the distributor cap. When the
rotor is turned by hand about 15" in the turning direction and
released, it should return.
[Point 41
Check function of the VCV inside the air governor
Using a timing light to check the degree of advance, disconnect the
vacuum hose from the distributor with the engine running at 2000
rpm or more. Check that the degree of advance becomes smaller.