Removing and installing engine control unit J623 without protective housing — VW

🧭 Before you start

Fits: VW Jetta VI (16, 2010–2018); platform codes AV2, AV3

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• A print-out can be made if required. To do this, press the "“Print”" button.
• If the fault memory was cleared, the readiness code must be generated vehicle diagnostic tester"“Guided functions”".

🔧 Engine codes this applies to

📋 Procedure

1. Switch off ignition.
2. Remove wiper arms and plenum chamber cover.
3. Remove plenum chamber bulkhead General body repairs, exterior50Plenum chamber bulkhead; Removing and installing plenum chamber cover.
4. Release and detach front connector (1) from engine control unit.
5. Lever up catch (2) slightly.

6. Then push engine control unit out of retainer (arrow).
7. Release and detach rear connector from engine control unit.
8. Connect and lock rear connector to engine control unit.
9. Push engine control unit onto retaining plate.
10. Push locking mechanism (2) towards engine control unit.
11. Connect and lock front connector (1) to engine control unit.
12. Install plenum chamber bulkhead General body repairs, exterior50Plenum chamber bulkhead; Removing and installing plenum chamber cover.
13. Install wiper arms and plenum chamber cover.
14. Connect diagnosis cable connector (2) to diagnostic connection in driver footwell.
15. Start engine and run at idling speed.
16. Switch ignition on.
17. Press button for "“Vehicle self-diagnosis”" on display.
18. Press button "“01 - Engine electronics”" on display. [Note: A print-out can be made if required. To do this, press the "“Print”" button.]
19. Press "“02 - Read fault memory”" button on the display.
20. If no fault is stored in engine control unit, "“0 fault detected”" is displayed.
21. If faults are stored in the engine control unit, these are listed on the display.
22. Press ← button.
23. Press "“05 - Delete fault memory”" button on the display.
24. Press "“06 - End output”" function. [Note: If the fault memory was cleared, the readiness code must be generated vehicle diagnostic tester"“Guided functions”".]

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