| 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 and workshop equipment required |
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| Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3A- |
| Perform the following operations after voltage supply open circuit: |
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| Switch ignition on for at least 10 seconds. |
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| Adapt the engine control unit to the throttle valve control part → Chapter |
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. |
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| Perform a longer test drive until the poor driving characteristics are eliminated. |
| During the road test the following operating conditions must be fulfilled: |
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| The coolant temperature must exceed 80 °C . |
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| When the temperature is reached, the operating conditions Idling Part throttle Full throttle Overrun must be attained several times. |
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| At full throttle the speed must exceed 3500 rpm. |
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