Removing and installing engine control unit J623 with protective housing, Polo — VW

🧭 Before you start

Fits: VW Polo 6R (2009–2014)

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• The readiness code must be generated if the event memory has been cleared.

🔧 Engine codes this applies to

📋 Procedure

1. Switch off ignition.
2. Open wiring guide (1) and lift locking device (2).
3. Take engine control unit out of retainer.
4. Unscrew shear-head bolt (1) using pliers.
5. Turn engine control unit (2) over and also unscrew all other shear-head bolts using pliers.

6. Pull retainer (1) and protective housing (2) off engine control unit (3) in (direction of arrow).
7. Release connectors on engine control unit and pull off connector.
8. Fit connectors and lock in position.
9. Push the protective housing over the engine control unit.
10. Install retainer for protective housing using new shear-head bolts.
11. Tighten shear-head bolts evenly until head shears off.
12. Insert engine control unit into mounting bracket on plenum chamber bulkhead until it audibly engages in catches (1).
13. Insert wiring into wiring guide (1) and close guide.
14. If engine control unit has been renewed, clear learnt values and adapt engine control unit Vehicle diagnostic tester"“Guided function”".
15. Read event memory, rectify any faults and then clear Vehicle diagnostic tester event memory,"“Guided Fault Finding”".
16. The readiness code must be generated if the event memory has been cleared.
17. Carry out a road test.
18. Read control unit event memory again.

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