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Checking secondary air pump relay J299 and activation > < Checking voltage supply

A4 Mk1

Checking activation
Checking activation
l  Vehicle diagnostic, testing and information system -VAS 5051- is connected; vehicle self-diagnosis and vehicle system “01 - Engine electronics” is selected. When doing this the ignition must be switched on.
   
–  Connect voltage tester -V.A.G 1527 B- to contacts -1- (plus) and -2- of the connector.
  V96-0749
Display on -VAS 5051-:
–  Under selection menu -1- select the diagnostic function “03 - Final control diagnosis”.
–  Press the button → until the secondary air inlet valve -N112- is actuated.
l  LED should flash slowly.
–  Exit function “03 - Final control diagnosis” by pressing the ← key.
–  Press “06 - End output”.
–  Switch off ignition.
  A01-0122
If the LED lamp does not flash or lights up continuously:
–  Connect test box -V.A.G 1598/31- to connectors of wiring harness; do not connect engine control unit. Connect earth clamp of test box to earth (not shown in illustration) → Simos injection and ignition system (4-cyl.); Rep. Gr.24.
  Caution
To prevent damage to the electronic components, select appropriate measuring range before connecting the measuring cables and observe the test requirements.
  A24-0137
–  Check for open circuit and short to positive or earth in the following wiring:
  V96-0749
Connector
Contact		Test box -V.A.G 1598/31-
Socket
-2-71

–  Eliminate open circuit in wiring (refer to current flow diagram).
If the wiring is OK:
–  Renew engine control unit.
   

Checking secondary air pump relay J299 and activation > < Checking voltage supply