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 MANUALSBMW2001320I (E46) (CANADA) L6-2.2L M54REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONKEY IDENTIFICATION AND START PROCEDURE
2001 BMW 320i (E46) (CANADA) L6-2.2L M54
Key Identification and Start Procedure
2001 BMW 320i (E46) (CANADA) L6-2.2L M54SECTION Key Identification and Start Procedure
Key identification and start procedure
The following procedure takes place after inserting the vehicle key in the ignition lock:
The transponder in the key is powered via the loop antenna and sends the key data to the EWS3 control unit.
- The EWS3 control unit then checks the key data to ensure it is correct and only then sends an enable signal to the engine management system and starter.
- After the engine has started, the EWS3 control unit generates new key data (change code) and transfers them to the transponder in the key.
- A new variable code is also created and stored in the DME/DDE control unit.
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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.