Test sequence

Charge pressure is measured under Wide Open Throttle (WOT) while driving or on the roller type test stand.

Observe the safety precautions that apply to road tests, see SAFETY PRECAUTIONS .

Disconnect connection hose between intake manifold and fuel pressure regulator at intake manifold and connect to T -piece of turbocharger tester (VAG1397A).

Fig 1: Connecting Turbocharger Tester (VAG1397A) Between Intake Manifold And Fuel Pressure Regulator At Intake Manifold

Courtesy of VOLKSWAGEN OF AMERICA, INC.

NOTE:

Using turbocharger tester, see operating instructions.
The hoses must be connected absolutely free of leaks.
When charge pressure is measured during the drive, a second person is necessary to operate the turbocharger tester for safety reasons.
Make sure that the pressure hose is not pinched between engine hood and chassis.