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Intake manifold, air filter > < Carry out the vacuum test of the injection units

Octavia Mk2

Check the pressure holding valve in the fuel return-flow line
Check the pressure holding valve in the fuel return-flow line
The pressure holding valve has the function to always hold a remaining pressure (control quantity) of approx. 0.1 MPa (1 bar) in the fuel return-flow line.
The injection units (piezo injectors) require this control quantity for their function.
Special tools and workshop equipment required
t  Pressure gauge, e.g. -VAS 6330-
t  Adapter, e.g. -VAS 6330/3-1-
t  Adapter, e.g. -VAS 6330/3-2-
t  Cleaning and degreasing agent, e.g. -D 009 401 04-
t  Protective goggles and gloves
Test sequence
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Observe rules for cleanliness → Chapter.
–  Remove engine cover → Chapter.
  WARNING
Wear protective gloves and protective googles when working with grease remover!
–  Before removing, clean the return line connection at the injection unit of cylinder 1 with a grease remover.
–  Dry the return line connection of cylinder 1.
–  Cover the return line connection of cylinder 1 with a cloth.
   
–  Unlock the return line connection of cylinder 1 using a screwdriver and a set of pointed pliers.
  Note
Always replace clamps.
  N23-10374
–  Disconnect the connections of the fuel return-flow line at the injectors in -direction of arrow-.
  N15-10444
–  Connect the pressure gauge -6330- with the adapters -VAS 6330/3-1- and -VAS 6330/3-2- between the return line connection at the injection unit and the return-flow line.
–  Open shut-off cock of the pressure gauge.
–  Start engine and run in idle.
–  Read the pressure on the pressure gauge -VAS 6330-.
l  Specified value: approx. 0,1 MPa (1 bar)
If the specified value is not reached, replace the pressure holding valve.
  N23-10304

Intake manifold, air filter > < Carry out the vacuum test of the injection units