Audi Workshop Service and Repair Manuals

Checking tandem pump

Special tools and workshop equipment required

t	Vehicle diagnosis, testing and information system -VAS 5051-

t	Tandem pump tester -VAS 5187-

t	Audi A2 engine cover protector -VAS 6011-

Procedure l  Coolant temperature at least 85 °C. l  Unit injectors OK Observe rules for cleanliness → Chapter. –  Wash outer side of bonnet and dry with chamois leather. –  Release service flap from inside the vehicle.

–  Release bonnet -arrows- and pull it forwards slightly.

–  Attach Audi A2 engine cover protector -VAS 6011- to bonnet.   Note

Do not store bonnet in upright position. –  Remove bonnet and put aside with the protective cover facing downwards.

–  Disengage hose -1- from retainer. –  Take off engine cover panel -arrows-.   WARNING t  In extreme cases the fuel lines and the fuel can reach a temperature of 100 °C on vehicles with unit injector engine. Allow the fuel to cool down before disconnecting the lines - danger of scalding. t  Wear protective gloves. t  Wear safety goggles.

–  Remove screw plug -arrow-.

–  Connect tandem pump tester -VAS 5187- as shown in illustration. –  Connect up the vehicle diagnostic, testing and information system -VAS 5051-. –  Start engine and increase engine speed to 1,500 rpm. –  Observe pressure on pressure gauge. l  Specification: at least 3.5 bar If specification is not obtained: –  Renew tandem pump → Chapter.   Note After removing pressure gauge, tighten plug to 25 Nm. Renew seal.