Removing and installing anti-theft engine control unit J623 (vehicles ▸model year 2007) — VW

🧭 Before you start

Fits: VW Polo 9N (2001–2009)

• Opens: brake fluid

🔧 Engine codes this applies to

📋 Procedure

1. Switch off ignition.
2. Remove windscreen wiper arms and the cover for plenum chamber: Electrical system92Removing and installing windscreen washer system
3. ⚠ Cover the brake hose and the cable to the brake fluid container in order to avoid damage. — Cut into heads of shear bolts (arrows).
4. Twist bolts out using pliers and remove cover from protective housing.
5. Push the clips of the protective housing in the plenum chamber together and unhook it from the bulkhead.

6. Pull the protective housing off the engine control unit.
7. Release connector on engine control unit and pull off connector.
8. Fit connector and lock in position.
9. Push the protective housing over the engine control unit.
10. Install cover of protective housing using new shear bolts.
11. Tighten shear bolts evenly until heads shear off.
12. Hook the protective housing into the bulkhead and push the clips into the openings.
13. Install windscreen wiper arms and the cover for plenum chamber: Electrical system92Removing and installing windscreen washer system
14. If engine control unit is renewed, clear learnt values and adapt engine control unit "“Guided fault finding”".
15. Read fault memory, repair faults as necessary and then clear fault memory "“Guided fault finding”".
16. The readiness code will have to be created once the fault memory has been deleted.
17. Carry out a road test.
18. Read control unit fault memory again.

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