Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN2003GTI (1J1) L4-1.8L TURBO (AWP)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETESTING AND INSPECTIONPROGRAMMING AND RELEARNINGRELEARN PROCEDURE
2003 Volkswagen GTI (1J1) L4-1.8L Turbo (AWP)
Relearn Procedure
2003 Volkswagen GTI (1J1) L4-1.8L Turbo (AWP)SECTION 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.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.