Volkswagen Workshop Service and Repair Manuals

Special tools, testers and auxiliary items

• ◆ Test box V.A.G 1598/18
• ◆ Adapter set V.A.G 1594
• ◆ Diode test lamp V.A.G 1527

Test conditions

• ● → Fuse -3- on secondary air pump relay (J299) -4- OK.

Test sequence

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.

• ‒ → Pull pressure hose off non-return valve -1-.
• ‒ Bridge test box sockets 01 + 50 with aux. cables from V.A.G 1594.
       The secondary air pump motor must run
       and air must exit the
       connecting hose.

If the motor runs, but no air exits hose:

• ‒ Check hoses and pipes, if necessary replace secondary air pump motor.

If the secondary air pump motor does not run:

• ‒ Pull 2-pin connector off secondary air pump motor (V101).
• ‒ Connect diode test lamp V.A.G 1527 to disconnected connector using aux. cables from V.A.G 1594.
       The LED must light-up

LED lights up (voltage supply OK):

• ‒ Replace secondary air pump motor.

LED does not light up:

• ‒ Reconnect 2-pin connector.
• ‒ Check activation of secondary air pump motor:

=> Repair group 01; self-diagnosis; final control diagnosis

• ‒ Interrogate and erase fault memory:

=> Repair group 01; Self-diagnosis; Interrogating fault memory