Activated charcoal filter system

Assembly overview - parts of activated charcoal filter system ⇒ 3.1 Assembly overview - parts of activated charcoal filter system

Checking fuel tank breather ⇒ 3.2 Checking fuel tank breather

Observe safety precautions ⇒ 1.2 Safety regulations for working on fuel supply.

Observe rules for cleanliness ⇒ 1.3 Rules for cleanliness.

3.1 Assembly overview - parts of activated charcoal filter system

• 1 Breather hose
  • Ensure firm seating.
• 2 Pressure retention valve with connecting hose
  • Ensure firm seating.
  • From gravity valve on fuel tank
• 3 Breather connection
  • Visible from below
• 4 10 Nm
• 5 Throttle valve module - J338-
  • With intake connection.
• 6 Activated charcoal filter solenoid valve 1 - N80-
  • Valve closed with ignition switched off
  • When engine is warm, valve will be activated (pulsed) by engine control unit
• 7 Connector
• 8 Activated charcoal filter
  • Location: in rear right wheel housing.

3.2 Checking fuel tank breather

Special tools and workshop equipment required

• Hand vacuum pump VAS 6213

Prerequisites for check

• Ignition must be switched off.

Test sequence

• First pull breather hose -1- from activated charcoal filter on activated charcoal filter system solenoid valve 1 - N80- -2-.
• Connect hand vacuum pump VAS 6213 to hose -1- as shown.
• Operate hand vacuum pump V.A.G 6213 several times. There must be no development of vacuum.

If vacuum builds up:

• Check breather opening -3- on lower activated charcoal filter -4- for soiling, clean if necessary.

If vacuum does not build up:

• Temporarily seal breather opening -3- and operate vacuum pump again several times. Vacuum must build up.

If vacuum does not build up:

• Renew activated charcoal filter.