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Inspecting the electronic power control (electronic throttle) > < Checking the fuel tank venting

Octavia Mk1

Testing activated charcoal filter system solenoid valve 1
Testing activated charcoal filter system solenoid valve 1
Special tools and workshop equipment required
t  Vehicle system tester -V.A.G 1552 - with cable -V.A.G 1551/3-
t  Hand multimeter (e.g. -V.A.G 1526 A-)
t  Voltage tester (e. g. -V.A.G 1527 B-)
t  Adapter cable set (e.g. -V.A.G 1594 A-)
t 
t  Test box -V.A.G 1598/31-
Check tightness
In dead condition the solenoid valve is closed.
–  Detach hose from activated charcoal filter solenoid valve -N80-.
–  Connect a suitable manometer and a compressed air device (air pump) to the solenoid valve.
–  Generate a visible air pressure.
–  Initiate → Chapter an actuator diagnosis and select the activated charcoal filter solenoid valve 1 -N80-.
–  When the solenoid valve is opened the displayed air pressure must drop and when it is closed it must clearly rise again, if not replace the solenoid valve.
Check solenoid valve -N80- electrically
–  Pull out plug at the valve.
–  Perform a resistance measurement with the handheld multimeter between the valve contacts.
Specified value: 22 to 30 Ω
–  If the nominal value is not reached, replace the solenoid valve.
Check voltage supply of the solenoid valve -N80-
  Note
The voltage supply for the solenoid valve is performed via the fuel pump relay.
Test condition
   
l  The fuse 43 must be o.k.
Test sequence
–  Disconnect plug at solenoid valve.
  S97-0319
–  Connect the voltage tester between contact 1 of the plug and the engine mass.
–  Activate the starter.
Specified value: The voltage tester must light up.
–  If the voltage tester does not light up, check the continuity of the wiring from contact 1 to fuse 43, if necessary repair → Current flow diagrams and Fitting locations.
–  If the wiring is o.k., test fuel pump relay → Chapter.
Check actuation of the solenoid valve -N80 -
  S24-0266
–  Connect voltage tester between contact 2 (earth control of the engine control unit) and positive terminal of the battery.
–  Initiate → Chapter an actuator diagnosis and select the activated charcoal filter solenoid valve 1 -N80-.
Specified value: The voltage tester must flash.
If the voltage tester does not flash or if it remains lit:
–  Switch off ignition.
  S24-0269
–  Connect the test box -V.A.G 1598/31 - to the wiring loom on the engine control unit → Chapter.
–  If the voltage tester lights up continuously, check the wiring from contact 2 of the plug at the solenoid valve for bush 61 of the test box for short-circuit to earth.
–  If the voltage tester does not flash, check the wiring from contact 2 of the plug at the solenoid valve for bush 61 of the test box for short-circuit to positive or for interruption.
–  If there is neither a line interruption nor a short-circuit; replace engine control unit → Chapter.
  S24-0267

Inspecting the electronic power control (electronic throttle) > < Checking the fuel tank venting