Toyota MR2 1988 Repair Manual page 87

EM-44
Battery
e
EB
Battery
ENGINE MECHANICAL - Cylinder Head (4A-GE)
Vacuum
EM2592
Air
EM440 7 EM4408
Vacuum
EM2240
EC1478
EC1479
INSPECTION OF TOYOTA- VARIABLE
INDUCTION SYSTEM (T-VIS)
1. INSPECT AIR CONTROL VALVE
(a) With 300 mmHg (11.81 in.Hg, 40.0 kPa) of vacuum
applied to the actuator, check that the control valve
moves smoothly to the fully closed position.
(b) With the vacuum released, check that the valve
quickly fully opens.
If abnormal, replace the valve.
2. INSPECT VACUUM TANK
(a) Check that air flows from pipe A to B.
(b) Check that air does not flow from pipe B to A.
(c) Apply 500mmHg (19.69 in.Hg, 66.7 kPa) of vacuum
to pipe A and check that there is no change in
vacuum after one minute.
If there is change, replace the vacuum tank.
3. INSPECT VACUUM SWITCHING VALVE (VSV)
(a) Connect the VSV terminals to the battery terminals
as illustrated.
(b) Blow into pipe E and check that air comes out of pipe
F.
(c) Disconnect the battery.
(d) Blow into pipe E and check that air comes out of the
air filter.
If a problem is found, replace the VSV.