Audi Workshop Service and Repair Manuals

Test sequence

→ Display on VAS 5051:

• ‒ Under -1- select diagnostic function "04 - Basic setting".

→ Display on VAS 5051:

•     1 -    Enter display group

• ‒ Enter "011" for "display group number 011" in zone -2- and confirm the entry by pressing the Q button.
• ‒ The idling speed is increased to 1380 ... 1420 rpm.
• ‒ The vacuum unit for boost pressure control is actuated in intervals.

→ Display on VAS 5051:

• ‒ Check readout in display zones -2- and -3-.

• ‒ → Remove oil dipstick -1- from guide tube.
• ‒ Remove engine cover -arrows-.
• ‒ Reinsert dipstick in guide tube.

• ‒ → Check that the operating rod moves at the turbocharger -arrow-.

→ Display on VAS 5051:

If the specified value in display zone 3 is not achieved or the operating rod on turbocharger does not move or only in stages:

• ‒ Check linkage and vacuum unit for boost pressure control => Page 21-13.
• ‒ Check vacuum actuation to turbocharger => Page 21-17.

Continue the test as follows:

• ‒ Switch over to "Read measured value block".
• ‒ Fully accelerate the vehicle from 2000 rpm in third gear or with selector lever at position 2 (without kickdown) and observe rev counter.
• ‒ At approx. 3000 rpm, press the key "Print - Save result" on the VAS 5051.

If boost pressure is not within the specified range:

• ‒ Check the charge air system for leaks.
• ‒ Check linkage and vacuum unit for boost pressure control => Page 21-13.
• ‒ Check boost pressure control solenoid valve N75 => Page 21-27.

If both are OK, but the boost pressure is too low:

• ‒ Replace turbocharger => Page 21-42.
• ‒ End function "08 - Read measured value block" by pressing the ◂ key.
• ‒ Press "06 - End output".