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.

Removing engine control unit

• ‒ Switch off ignition.
• ‒ Remove cover of protective housing for control units.

• ‒ → Carefully lever off the retainer bar with a screwdriver -arrow-.
• ‒ Then release connectors on control unit and pull off.
• ‒ Lift out the old engine control unit and insert the new one.

Installing engine control unit

Installation is performed in the reverse sequence.

After installing the engine control unit, carry out the following operations:

• ‒ Perform adaption of immobilizer to engine control unit

=> Electrical system; Repair group 01; Self-diagnosis of immobilizer; Adaptation procedure when engine control unit is replaced

• ‒ Code the new engine control unit
  
• ‒ Perform adaption of throttle valve control part (J338)
  => Page 24-148.
• ‒ On vehicles with cruise control (identifiable from the steering column switch), activate the cruise control function in the engine control unit.

=> Electrical system; Repair group 01; Self-diagnosis of cruise control system (CCS).

• ‒ An adaption from kick-down switch has to be performed in vehicles with an automatic gearbox => Page 24-170.
• ‒ Interrogate fault memory and erase if necessary
  => Page 01-9