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Test fuel pump relay and control > < Testing injection valves

Octavia Mk1

Inspecting the injection rate, tightness and jet formation of the injectors
Inspecting the injection rate, tightness and jet formation of the injectors
Special tools and workshop equipment required
t  Remote control -V.A.G 1348/3 A -
t  Auxiliary cable -V.A.G 1348/3-2-
t  Measuring tool set -V.A.G 1594 A -
t  Measuring glasses (e.g. -V.A.G 1602 -)
Test condition
l  Fuel pressure o.k., test → Chapter.
–  Detach vacuum hose from fuel pressure regulator.
–  Detach the fuel feed line and return line on the quick-release fittings.
  WARNING
The fuel system is under pressure!
–  Detach the hose which connects the solenoid valve for the activated charcoal filter with the throttle valve control unit on the valve as well as on the control unit and unhook it at the intake manifold.
–  Disconnect the plug from the valve for intake manifold changeover and from the hall sender.
–  Disconnect the spark plug connectors for cylinders two and three.
–  Unscrew the fuel distributor from the intake manifold and remove it carefully with the injection valves from the intake manifold.
–  Unclip cable harness from the cable guide and remove.
–  Carefully pull out the fuel distributor with injection valves, fuel feed line and return line and ACF hose towards the right (from the ACF reservoir) from below the intake manifold and fit again the fuel feed line and return line (blue marking).
–  Insert injector to be tested in a measuring glass, e.g. -V.A.G 1602-.
   
–  Lay a contact of the injection valve with the test cable and alligator clip from the adapter cable set -V.A.G 1594 A- on the engine mass.
–  Connect the other contact of the injection valve with remote control -V.A.G 1348/3 A -, adapter cable -V.A.G 1348/3-2- and auxiliary cable to battery positive.
–  Initiate an actuator diagnosis and select the activated charcoal filter solenoid valve 1 -N80- → Chapter. The fuel pump runs for approx. 50 s.
–  Test the tightness of the injectors (visual inspection). With the fuel pump running per valve only 1...2 drops (50 s) of fuel may escape.
–  If the fuel loss is greater adjust the fuel pump (end final control diagnosis) and replace defective injector.
–  Initiate again an actuator diagnosis and select the activated charcoal filter solenoid valve 1 -N80-.
  Note
The final control diagnosis can only be initiated again after the ignition has been briefly switched off.
–  Operate the remote control for 30 seconds immediately after selecting the ACF valve (the fuel pump is switched on for approx. 50 s) -V.A.G 1348/3 A-.
–  Perform the measurement on all injection valves (initiate again an actuator diagnosis).
–  Once all four injectors have been driven, position the graduated measuring glasses on an even base.
Specified value: 85 up to 105 ml.
–  If the measured value of one or more injectors is outside the tolerance value, disconnect the fuel pump (terminate final control diagnosis) and replace the defective injector.
–  If the measured values are outside tolerance for all injectors, check fuel pressure → Chapter.
  Note
When testing the injection rate also check the jet formation. The jet must be the same for all injection valves.
The installation of the fuel distributor with the injection valves occurs in reverse order. To do so, pay attention to the following points:
l  Replace “O” rings on all opened connection points. (For replacing the front “O” ring, on no account remove the plastic valve head cap - lift the “O” ring over the plastic cap).
l  Moisten “O” rings with clean engine oil.
l  Pay attention to correct positioning of the injectors.
l  Check perfect fit of the retaining clips.
  A24-0079

Test fuel pump relay and control > < Testing injection valves