Checking activated charcoal filter system solenoid valve 1 -N80 — AUDI

AQJ ASG ANK
Testing for leaks

When there is no electrical supply, solenoid valve remains closed.

Disconnect hoses from solenoid valve for activated charcoal filter -N80.
Connect auxiliary hose to one connection of ACF valve.
Connect the vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and select engine electronics control unit with "Address word" 01 => Page
01-15.
For this purpose, the ignition must be switched on.
Start final control diagnosis and select solenoid valve for activated charcoal filter -N80 (tank breather valve) =>Page
01-74.

Final control diagnosis
⇒
Fuel tank breather valve -N80
Indicated on display:

The solenoid valve must click ...

... and should open and close (check by blowing into the auxiliary hose).

If the valve does not click, electrically check the solenoid valve 1for activated charcoal filter =>Page
24-168.
If the valve does not open and close correctly, replace solenoid valve 1 for activated charcoal filter.

Electrical check for solenoid valve 1 for activated charcoal filter -N80

Disconnect hose from the solenoid valve for the activated charcoal filter -N80.
Measure resistance between contacts on valve using hand-held multimeter V.A.G 1526.

Specified value: 22...30 Ohms

If specification is not attained:

Replace solenoid valve for activated charcoal filter -N80.

If specified value is attained:

Check the voltage supply =>Page
24-169.

Checking solenoid valve voltage supply

Note:

The ACF valve receives its power supply via the fuel pump relay.

Check fuse for ACF valve.

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

If the fuse is OK:

Disconnect hose from the solenoid valve for the activated charcoal filter -N80.
Connect diode test lamp V.A.G 1527 between engine earth and socket 1 on the connector.
Operate starter.

The diode test lamp should illuminate.

If the diode test lamp does not illuminate:

Check the wiring from socket 1 via the fuse to the fuel pump relay for continuity, repair, if necessary.

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

If wiring is OK, test fuel pump relay => Page
24-51.

If diode test lamp illuminates check actuation => Page
24-170.

Checking ACF valve actuation

Connect the V.A.G 1527 diode test lamp between socket 1 (positive) and socket 2 in the connector.
Start final control diagnosis and select solenoid valve for activated charcoal filter (N80) =>Page
01-74.

Diode test lamp should flash.

If diode test lamp does not light or is continuously illuminated, check wiring connection.

Checking wiring

Connect test box V.A.G 1598/31 to wiring harness for engine control unit; do not connect the engine control unit => Page
24-12.

If the diode test lamp is continuously illuminated check the following wiring for short to earth.

2-pin connector on wiring harness, socket · Test box V.A.G 1598/31 socket
2 · 64

If the diode test lamp does not flash check for open circuit and short to positive or open circuit in the following wiring connection.

2-pin connector on wiring harness, socket · Test box V.A.G 1598/31 socket
2 · 64

Wire resistance: max. 1.5 Ohm

If necessary, rectify short circuit to earth or open circuit.

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

If no short or open circuit is found.
Replace engine control unit -J220 =>Page
24-16.