Audi Workshop Service and Repair Manuals

The secondary air inlet valve is located on the intake manifold below the coolant expansion tank.

• ‒ Connect vehicle diagnostic, testing and information system VAS 5051 (or fault reader V.A.G 1551) and select engine electronics control unit by entering address word "01" ( .)
  When doing this the ignition must be switched on.
• ‒ Start final control diagnosis and activate secondary air inlet valve
  .

• The secondary air inlet valve should click.

If the secondary air inlet valve does not click:

• ‒ → Unplug 2-pin connector from valve.
• ‒ Connect diode test lamp V.A.G 1527 to disconnected connector using test leads from V.A.G 1594.
• ‒ Repeat final control diagnosis.

If the diode test lamp now flashes during the final control diagnosis:

• ‒ Fit a new secondary air inlet valve.

If the diode test lamp still does not flash:

• ‒ Switch off ignition.
• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
  => Page 24-10.

• ‒ Test for open circuit in the following wiring connection:

• Resistance in wiring: max. 1.5 ω

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

If no fault in wire is detected:

• ‒ Test voltage supply to secondary air inlet valve using current flow diagram.

=> Current flow diagrams, Electrical fault finding and fitting locations binder