A3 Mk1
Engine control unit
Procedure after voltage supply open circuit
All values learnt by the engine control unit and the basic setting values as well as the readiness code will be erased if the voltage supply is interrupted. Therefore, depending upon the vehicle mileage it can lead to serious engine running problems. Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
Work sequence Perform the following operations after voltage supply open circuit:
Note: During the idling check the tank venting valve (N80) and the air conditioner are switched off and the Lambda regulation learning process is initiated.
Observe the valid safety precautions when carrying out a road test
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