Audi Workshop Service and Repair Manuals

Checking solenoid valve 1 for activated charcoal filter -N80- Special tools and workshop equipment required t  -V.A.G 1526 A- t  -V.A.G 1527 B- t  -V.A.G 1594 A- t  -V.A.G 1598/31-

t  Vehicle diagnosis and service information system -VAS 5052- Checking for leaks Activated charcoal filter solenoid valve 1 -N80- remains closed when it is not receiving any current. –  Detach the hoses from the activated charcoal filter system solenoid valve 1 -N80-. Leave the connector plugged in. –  Attach a test hose to one connection of the activated charcoal filter system solenoid valve 1 -N80-. –  Connect up the vehicle diagnostic and service information system -VAS 5052- and select the engine electronics control unit. The ignition must be switched on when doing so. –  Initiate final control diagnosis and activate activated charcoal filter solenoid valve 1 -N80- → Chapter. t  The solenoid valve should click. t  ... and should open and close (check by blowing into the auxiliary hose). If the solenoid valve does not click: –  Check the internal resistance of the activated charcoal filter system solenoid valve 1 -N80-. If the activated charcoal filter system solenoid valve 1 -N80- does not open or close properly: –  Replace the activated charcoal filter system solenoid valve 1 -N80-. Checking internal resistance –  Unplug the connector at the activated charcoal filter system solenoid valve 1 -N80-.

–  Connect the multimeter (resistance measuring range) to the activated charcoal filter system solenoid valve 1 -N80-. t  Specification: 22 ... 30 Ω If the reading does not match the specification. –  Replace the activated charcoal filter system solenoid valve 1 -N80-. If the reading matches the specification: –  Check voltage supply. Checking voltage supply   Note t  Fuse of activated charcoal filter system solenoid valve 1 -N80- OK → Current flow diagrams, Electrical fault finding and Fitting locations t  Fuel pump relay -J17- OK; checking → Chapter   Note The activated charcoal filter system solenoid valve 1 -N80- is supplied with power via the fuel pump relay -J17-. –  Unplug the connector at the activated charcoal filter system solenoid valve 1 -N80-.

–  Connect up the voltage tester -V.A.G 1527 B- as follows:

Connector Contact	Measure to
1	Engine earth

–  Briefly operate the starter (engine may also start). t  The LED must light If the LED does not light: –  Check for open circuit in the wiring from contact 1 of the connector via the fuse to the fuel pump relay -J17-: –  Eliminate open circuit in wiring if necessary. If the LED lights: –  Check actuation. Checking activation

–  Connect up the voltage tester -V.A.G 1527 B- to contacts 1 (positive) and 2 of the connector. –  Initiate final control diagnosis and activate activated charcoal filter solenoid valve 1 -N80- → Chapter. t  The LED must flash If the LED lamp does not flash or lights up continuously: –  Connect the test box -V.A.G 1598/31- to the wiring harness to the engine control unit, but do not connect the actual engine control unit → Chapter.

–  Check for open circuit and short to earth or positive in the following wiring:

Connector Contact	Test box -V.A.G 1598/31- Socket
2	64

–  Eliminate open circuit in wiring/short circuit if necessary. If the wiring is OK: –  Replace the engine control unit → Chapter.