Audi Workshop Service and Repair Manuals

Note:

When the engine control unit is disconnected the learned values are erased but the contents of the fault memory remain intact.

Special tools and workshop equipment required

• ◆ VAS 5051 and VAS 5051/1

Removing

• ‒ Connect the vehicle diagnostic, testing and information system VAS 5051 => Page 01-2, and select the vehicle system "01 - Engine electronics" from the menu. When doing this the ignition must be on.

→ Display on VAS 5051:

•     1 -    Control unit identification of engine control unit => Page 01-5
•     2 -    Control unit identification of immobiliser => Page 01-5

• ‒ Always start by calling up and printing out the control unit identification.
• ‒ Check the coding against the list of coding variants => Page 01-72.
• ‒ Switch off ignition.

• ‒ → Remove rubber seal from plenum chamber in direction of arrow-.
• ‒ Remove plenum chamber cover -1- from the front.

• ‒ → Remove cover for electronics box in plenum chamber -arrows-.

• ‒ → Carefully lever off the retainer bar with a screwdriver -arrow-.

• ‒ → Release retainer catch -arrows- and unplug connectors -1- and -2- from control unit.
• ‒ Take out engine control unit.

Installing

Install in reverse sequence; note the following points:

Note:

After installing the new engine control unit the following operations must be performed:

• ‒ Interrogate and if necessary erase the fault memory => Page 01-7.
• ‒ Check the notes on coding new engine control units => Page 01-72.
• ‒ On vehicles with cruise control (identifiable by controls on steering column), activate the cruise control via the engine control unit => Page 23-95.
• ‒ Perform adaption of immobilizer to engine control unit.

=> Electrical system; Repair group 01