Volkswagen Workshop Service and Repair Manuals

Special tools, testers and auxiliary items

• ◆ Adapter set V.A.G 1594
• ◆ Diode test lamp V.A.G 1527

Test conditions

• ● Engine oil temperature 5 ... 40 °C
• ● Secondary air pump motor OK.

Test sequence

• ‒ → Pull vacuum hose -1- off secondary air inlet valve -2- (N112).
• ‒ Start engine and run at idling speed.
       When the secondary air pump motor runs,
       intake manifold vacuum must be perceptible
       at vacuum hose.

If no intake manifold vacuum is perceptible:

• ‒ Switch off engine.
• ‒ Pull 2-pin connector off secondary air inlet valve.
• ‒ Using aux. cables from V.A.G 1594 connect diode test lamp V.A.G 1527 to disconnected connector.
• ‒ Start engine and run at idling speed.
       The LED must light-up.

LED lights up (voltage supply OK):

• ‒ → Replace secondary air inlet valve -2-.

LED does not light up:

• ‒ Reconnect 2-pin connector.
• ‒ Check activation of valve:

=> Repair group 01; Final control diagnosis

• ‒ Interrogate and erase fault memory:

=> Repair group 201; Self-diagnosis; Interrogating fault memory