Toyota Land Cruiser 1988 Repair Manual page 117

EC-8 EMISSION CONTROL SYSTEMS- Fuel Evaporative Emission Control (EVAP) System
JAir
T-~-IE
.....
Vacuum
EC2730
JAir
INSPECTION OF VCV
CHECK VCV BY BLOWING AIR INTO PIPE
(a) Apply vacuum above 70 mmHg (2.76 in.Hg) to pipe
s.
(b) Blow air into pipe
Y
and check that air comes out of
pipe
Z.
(c) Stop the applied vacuum.
(d) Blow air into pipe Y and check that air does not
come out of pipe Z.
If a probtem is found, replace the VCV.