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Turbocharger > < Fuel supply, vehicles with four-wheel drive

Leon Mk1

Checking supply line, vacuum reservoir and non-return valve
Checking supply line, vacuum reservoir and non-return valve
   
–  Remove the engine cover upwards -arrows-.
–  Remove the switching valve for the radiator and the exhaust gas recirculation system -N345- from their mounts on the front side of the intake pipe.
  E10-10085
–  Pull vacuum hose at lower connection -arrow in I- off exhaust gas recirculation cooler changeover valve -N345- and off charge pressure control solenoid valve -N75--arrow in II-.
–  Seal open hose ends with suitable blanking plugs.
  Note
Do not use screws or threaded bolts.
–  Pull vacuum hose -arrow- off connection piece of vacuum pump.
  N21-10206
–  Connect hand vacuum pump -VAS 6213- to disconnected hose and generate a vacuum of 0.6 bar.
–  Observe hand vacuum pump pressure gauge for approx. 30 seconds.
l  Vacuum must not drop.
If vacuum drops:
–  Determine the damaged area or the leak in the hose and replace the respective hose section.
If pressure does not drop:
–  First pull hose off hand vacuum pump -VAS 6213-.
–  Remove one of the blind plugs from the hose line.
–  If the non-return valve functions properly, a clear hiss is audible when vacuum in vacuum reservoir is released.
If no hiss is audible:
–  Renew non-return valve.
If a hiss is audible:
–  Reconnect all disconnected vacuum hoses.
–  Check control line to turbocharger → Chapter.
  N21-10207

Turbocharger > < Fuel supply, vehicles with four-wheel drive