Removing and installing engine control unit with no theft protection — VW

🧭 Before you start

Fits: VW Golf V / Jetta (1K, 2003–2009); platform code AJ5

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• The readiness code must be generated if the fault memory has been erased:
• Observe applicable safety precautions during road test .

🔧 Engine codes this applies to

📋 Procedure

1. Switch off ignition.
2. Remove windscreen wiper arms and plenum chamber cover: Electrical system92Windscreen wiper system; Removing and installing windscreen wiper system.
3. Remove plenum chamber bulkhead: General body repairs, exterior50Plenum chamber bulkhead; Assembly overview - plenum chamber bulkhead.
4. Remove securing bolts (1) and remove cover plate (2).
5. Release foremost connector (1) from engine control unit and pull it off.

6. Lever up catch (2) slightly.
7. Then press engine control unit out of retainer in direction of (arrow).
8. Then release rearmost connector from engine control unit and pull it off.
9. Reconnect rearmost connector to engine control unit and lock it in position.
10. Push engine control unit onto retainer.
11. Press locking device (2) against engine control unit.
12. Reconnect foremost connector (1) to engine control unit and lock it in position.
13. Install plenum chamber bulkhead: General body repairs, exterior50Plenum chamber bulkhead; Assembly overview - plenum chamber bulkhead.
14. Install windscreen wiper arms and plenum chamber cover: Electrical system92Windscreen wiper system; Removing and installing windscreen wiper system.
15. If engine control unit has been renewed, erase learned values and adapt engine control unit: "“Guided function”".
16. Read fault memory, rectify any faults and then erase fault memory: "“Guided fault finding”". [Note: The readiness code must be generated if the fault memory has been erased:]
17. Carry out a road test. [Note: Observe applicable safety precautions during road test .]
18. Read fault memory of engine control unit again.

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