Urrea 2012 Manual De Usuario Y Garantía página 11

Locate the solenoid to be tested and remove the
line that goes to the component being tested.
Connect the testvac to the solenoid port and start
the engine. With the system turned off there
should be a zero gauge reading. Now turn the
system to the 'on' position and gauge reading
equal to the manifold vacuum should be noted.
If no reading exists remove the vacuum supply
line and test for manifold vacuum at this line.
If the vacuum does exist this indicates that the
solenoid is faulty or it is not receiving a 'switch
on' voltage (use a multimeter to test this). If no
vacuum exists trace the supply line back to the
vacuum source checking for kinks and breaks.
Testing thermal vacuum switches
There are many vacuum controlled circuits that
must only operate when the engine reaches
normal operating temperature. This is done
using thermal switches that remain in an "off"
position until a given temperature is reached.
To test this type of switch, remove the vacuum
supply line coming from the manifold to the
switch and test for manifold vacuum. If this
vacuum is correct refit the supply line to the
thermal switch and remove the opposing line
from the switch. Attach the testvac unit to the
port and start the engine. With a cold engine
no reading should be noted. When the engine
reaches normal operating temperature manifold
vacuum reading should be noted.
Testing vacuum operated heater taps
Climate conrol ventilation systems are becoming
very common on late model vehicles and most of
the systems use vacuum operated taps to control
de heating modes.
Return hose
On the majority of makes and models, the
system uses vacuum to turn the heater tap 'on'.
To test these remove the supply line from the tap
vacuum module and connect the testvac vacuum
pump. With the engine at normal operating
temperature locate and feel the heater return
hose. With the heater tap in the off position, this
hose should be cold. Now operate the vacuum
pump to open the tap. The gauge reading must
hold. If the hose does not begin to heat this
indicates that the tap is faulty.
Testing vacuum operated remote central
locking systems
Some makes and models use vacuum operated
bellows mounted in each door, to centrally lock
and unlock the vehicles doors. These systems use
either maniflod vacuum stored in a reservoir
for use when the engine is not running or an
electrically driven vacuum pump which operates
when the doors are locked or unlocked.
In either system, the testvac vacuum pumps is
ideal for testing each individual door bellows.
To do this, remove the door trims as required.
Remove the vacuum supply lines from bellows
and attach the testvac pump and operate to
apply vacuum to the bellows. Allow to sit for 30
seconds, no drop on the gauge should be noted.
If the bellows are found to be in order attach the
vacuum supply line to the test vac and operate
system to test for vacuum supply. If the vacuum
supply does not exist or is low trace back down
the lines to the vaccum supply looking for kinks,
restrictions or cracked lines. Repair as required
and retest.
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