Installation of a control pressure gauge
Use a VW 1318 manometer with a fitting and a cock to measure the pressure, which measures both the flow pressure and the inlet pressure.
Connect the manometer hoses between the dispenser and the control pressure supply line. coming from the control pressure regulator.
Remove air pockets from gauge hoses. To do this, start the engine, set the pressure gauge cock to the position to control the pressure and lower the pressure gauge so. so that it hangs freely on the hoses.
Connection diagram of a pressure gauge for checking fuel pressure in the injection system
Checking the performance of the fuel pump
Reduce the fuel pressure in the injection system.
Disconnect the fuel drain hose from the fuel pump to the tank and lower the hose into a beaker.
Remove the relay for turning on the fuel electric pump from the socket of the mounting block.
Connect the shunt to the switch terminal «+» battery with fuel pump power terminal.
Set to;0 with the switch on the shunt in position «included». thereby activating the electric fuel pump.
Measure the amount of fuel leaking into the beaker, which should be 900 cm3.
If the amount of fuel in the beaker is not correct, check the technical condition of the fuel filter and fuel pump.
Control pressure test
Connect a fuel pressure gauge as described above.
Start a cold engine.
Measure the control pressure, which for engines «WC». «KR»,
Warm up the engine to operating temperature.
Measure the control pressure, which for engines «WC». «KR», «KU» should be within 3.4-3.8 kg / cm2, for the engine «RT» - 4.1-4.3 kg / cm2.
Determine the malfunction from the table if the data obtained during the test does not correspond to the nominal ones.
Checking the pressure in the fuel injection system
* Values in parentheses are for the engine «RT».
Checking the fuel pressure in the system
Check fuel pump performance as above.
Install a fuel pressure gauge.
Install the pressure gauge cock in position «closed» to measure fuel pressure at the inlet.
Start the engine.
Measure the fuel pressure in the system, which for engines «WC», «KR», «KU» should be in the range of 4.7-5.4 kg / cm2, for the engine «RT» - 5.4-6.2 kg / cm2.
Determine the malfunction from the table if the data obtained during the test does not correspond to the nominal ones.
Residual pressure test
Warm up the engine to operating temperature.
Install a fuel pressure gauge.
Leave the engine to idle.
Set the pressure gauge valve to position «open» to measure the flow pressure.
Measure the control pressure on the manometer.
Switch off the ignition.
Determine the residual fuel pressure in the system 10 and 20 minutes after the engine stops and compare with the nominal values (see subsection «Detailed Specifications»).
Determine the malfunction according to the table if the data obtained during the test does not correspond to the nominal ones.
Checking the fuel pressure at the time of engine shutdown
Warm up the engine to operating temperature.
Install a fuel pressure gauge
Set the pressure gauge valve to position «closed» to measure inlet pressure.
Measure the fuel pressure in the system and compare with the nominal (cm. «Detailed Specifications»),
Switch off the ignition.
Measure the fuel pressure in the system when the ignition is turned off, which should drop to 2.6 kg/cm2.
Checking injection nozzles
Disconnect the wire from the negative battery terminal.
Unscrew the nozzles from the sockets and place them in the beakers.
Remove the fuel pump relay from the socket of the mounting block.
Connect the shunt to the switch terminal «+» battery with fuel pump power terminal.
Connect the negative cable to the battery.
Set the switch on the shunt to position «switched on, thereby activating the fuel pump. At the same time, not a single drop of fuel should appear from the injector nozzles for at least 2 minutes.
Remove the air line from the air flow meter to the throttle body.
Raise the pressure disk of the air flow meter.
Hold the pressure disc in the raised position until the fuel level in one of the beakers reaches a certain level.
Compare how different the fuel level is in the beakers. The allowable difference in the amount of fuel leaking into the beakers is 0.6 ml.
If abnormal, replace faulty injectors.
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