Volkswagen Workshop Service and Repair Manuals

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Hand vacuum pump V.A.G 1390

Engine codes AHU, 1Z

Test sequence

• ‒ Pull vacuum hose off (mechanical) exhaust gas recirculation valve.
• ‒ Connect hand vacuum pump V.A.G 1390 to valve.

• ‒ → Operate pump.
       The membrane rod must move towards
       vacuum connection (observe membrane rod
       via opening -arrow-).
• ‒ Pull hand vacuum pump hose of exhaust gas recirculation valve.
       The valve must clearly heard to close (membrane rod moves
       towards intake manifold).

Engine codes AFN, AVG, ALE

Test sequence

• ‒ Remove charge air cooler/intake manifold pressure pipe.
• ‒ Pull vacuum hose off (mechanical) exhaust gas recirculation valve.
• ‒ Connect hand vacuum pump V.A.G 1390 to valve.

• ‒ → Operate pump and observe membrane rod.

• The membrane rod must move in direction of arrow.

• ‒ Pull hand vacuum pump hose off exhaust gas recirculation valve.

• The membrane rod must move back against the direction of arrow to its original position.