Volkswagen Workshop Service and Repair Manuals

Test conditions

• ● Engine oil temperature at least 50 °C

Test sequence

• ‒ Switch on ignition.

• ‒ → Pull vacuum hose -5- off two-way valve (N161) -1- (to vacuum pump).
• ‒ Pull vacuum hose -3- off exhaust gas recirculation valve and blow into hose.
       The two-way valve must allow air to pass to vacuum pump
       connection (not blocked).
• ‒ Pull 2 pin connector -2- off exhaust gas recirculation two-way valve -1-.
• ‒ Blow again into vacuum hose -3-.
       The vacuum connection to vacuum pump must be closed
       and outlet to outside -arrow- open.