Draper 35891 handleiding
Handleiding
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7. Fuel Systems Testing
7.5 Electrically Operated Vacuum
Solenoid Testing
• Electrically operated vacuum solenoids are commonly
used in control circuits for air conditioning/ventilation
systems, emission control systems and idle step-up
systems.
1. Locate the solenoid to be tested and remove the line
that goes to the component.
2. Connect the vacuum tester to the solenoid port and
start the engine. With the system turned o the
gauge reading should be ‘0’.
3. Turn the system to the ‘on’ position and the gauge
reading should be equal to the manifold vacuum. If no
reading on the gauge, remove the vacuum supply line
and test for manifold vacuum at this point. 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.
7.6 Thermal Vacuum Switch Testing
• 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 ‘o’ position until a given
temperature is reached.
1. To test this type of switch, remove the vacuum supply
line coming from the manifold to the switch and test
the manifold vacuum.
2. If this vacuum is correct ret the supply line to the
thermal switch and remove the opposing line from
the switch.
3. Attach the vacuum tester to the port and start the
engine. With a cold engine no reading should be
noted. When the engine reaches normal operating
temperature a manifold vacuum reading should be
noted.
7.7 Vacuum Operated Heater Tap Testing
Climate control ventilation systems commonly use
vacuum operated taps to control the heating modes and
to turn the heater tap ‘on’.
1. To test, remove the supply line from the tap vacuum
module and connect the vacuum tester.
2. With the engine at normal operating temperature
locate the heater return hose. With the heater tap
in the ‘o’ position, this hose should be cold.
3. Operate the vacuum pump to open the tap. The
gauge reading must hold steady. If the tap is working
the return hose will begin to heat. If the hose does not
begin to heat, this indicates that the tap is faulty.
7.8 Automatic Transmission Vacuum
Operated Modulator Valves Testing
• Automatic transmissions are normally equipped with
a vacuum operated modulator valve in order for the
automatic transmission to detect engine loads and
adjust shift points to suit.
• The vacuum tester can test both whether the
modulation valve diaphragm is serviceable and to
simulate varying engine loads so modulator pressure
readings can be recorded.
1. Totestthemodulatorvalvediaphragm - remove the
vacuum supply line from the valve and attach the
vacuum tester. Operate the vacuum pump until
approximately 15inHg is achieved and monitor the
gauge reading for approximately 30 seconds. No
vacuum drop should be noted.
2. Tocheckmodulatorpressurereadings - attach a
pressure gauge to the appropriate port on the
transmission. Remove the vacuum supply line from
the modulator and attach the vacuum tester. Start
and run the engine and apply vacuum pressures.
Monitor readings and conrm that they conform with
the manufacturer’s specications.
– 11 –
EN
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Productinformatie
| Merk | Draper |
| Model | 35891 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 1727 MB |
