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volkswagen Workshop Repair Guides


New Beetle L4-2.0L (AZG) (2003)

Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Service and Repair > ECM, Adapting to Electronic Immobilizer > Page 269

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Engine Control Module: Service and Repair
Procedure After Correcting Voltage Supply Open Circuit

Procedure After Correcting Voltage Supply Open Circuit

All values learned by the Engine Control Module (ECM) 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, test equipment and auxiliary items

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VAG1551 scan tool or VAG1552 mobile scan tool with VAG1551/3B cable

Work sequence

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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Switch off ignition.

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Adapt the engine control module to the throttle valve control module.

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Perform idle check. 

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Generate readiness code. 

NOTE:  During idling make sure the activated charcoal filter solenoid valve and the air conditioner are switched off and the oxygen sensor control
learning procedure is initiated.

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Perform a longer test drive until the poor driving characteristics are eliminated.

Observe the valid safety precautions when carrying out a road test.

During the road test the following operating conditions must be fulfilled:

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The coolant temperature must exceed 80 °C

When the temperature is reached, the operating conditions:

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Idling

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Part throttle

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Full throttle

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Overrun

Must be attained several times.

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At full throttle the speed must exceed 3500 RPM

Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Service and Repair > ECM, Adapting to Electronic Immobilizer > Page 269

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