audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Hose connection plan for boost pressure control - engine code AGR > < Checking intake manifold temperature sender

A3 Mk1

Diesel Direct Injection and Glow Plug System (TDI 4 cyl.) >07.99
Testing the boost pressure system
Checking intake manifold pressure sender and altitude sender

The altitude sender is located in the diesel direct injection system control unit. The intake manifold pressure sender is a separate component and is located together with the intake manifold temperature sender in a joint housing in the charge air cooler. The intake manifold pressure sender is a separate component and is located on the intake manifold.
 
→ Read measurement block display group 10, engine not running
Read measured value block 10    ⇒
    0 mg/stroke     1027 mbar     1013 mbar    0.0 %
  • ‒ Compare reading in display field 2 (altitude sender -F96) to that in display field 3 (intake manifold pressure sender -G71).
    • Specified value: Pressures match
      (Tolerance ±30 mbar)

    If specified value is not attained:

    • ‒ Compare displayed pressures using a barometer (e.g. turbocharger tester V.A.G 1397/A),
      Tolerance ± 30 mbar

    If the value in display zone 2 does not correspond:

    • ‒ Renew Diesel direct-injection system control unit.

    If the value in display zone 3 does not correspond:

    • ‒ Connect test box V.A.G 1598/22 to wiring harness for engine control unit .
     
    A24-0094
    • ‒ → Remove the connector from the sensor => overview of fitting locations Page 23-3.

    The following wiring connections are to be checked for open circuits and/or short to positive or negative.

    4-pin connector on the wiring harness, contact

    Test box V.A.G 1598/22, socket

    3

    39

    4

    40
    • ‒ Rectify any open/short circuit as necessary.

    Hose connection plan for boost pressure control - engine code AGR > < Checking intake manifold temperature sender