Relearn Procedure

Procedure After Voltage Supply Open Circuit


If the voltage supply is interrupted, the engine control module loses all the "learned" and/or "basic" values. Therefore considerable driving characteristic problems may occur depending on vehicle mileage.

Special tools equipment
- VAG1551 scan tool or VAG1552 mobile scan tool with VAG1551/3B cable

Work sequence
Perform the following operations after voltage supply open circuit:
- Switch ignition on for at least 10 seconds.
- Switch ignition off.
- Perform idling check. Testing and Inspection


NOTE: During idling check the EVAP canister purge regulator valve and the air conditioner are switched off and the oxygen sensor control learning procedure is initiated.


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

Observe the valid safety precautions when carrying out a road test Technician Safety Information

During the road test the following operating conditions must be fulfilled:
- The coolant temperature must exceed 80 °C.
- When the temperature is reached, the operating conditions
Idling
Part throttle
Full throttle
Overrun
must be attained several times.
- At full throttle the speed must exceed 3500 RPM.