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

🧭 Before you start

Fits: platform code 1F8

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• The shear-head bolt threads are coated with locking compound. Heating the shear-head bolt with a hot air blower releases the locking effect of the locking compound.
• If the bolts cannot be unscrewed, saw into the heads of the shear-head bolts so that 2 parallel slots are created (arrows). Then unscrew.

🔧 Engine codes this applies to

📋 Procedure

1. Switch off ignition.
2. Remove windscreen wiper arms Electrical system92Windscreen wiper system; Removing and installing windscreen wiper arms.
3. Remove plenum chamber cover General body repairs, exterior50Bulkhead; Removing and installing plenum chamber cover.
4. Remove plenum chamber bulkhead General body repairs, exterior50Bulkhead; Assembly overview - bulkhead. [Note: The shear-head bolt threads are coated with locking compound. Heating the shear-head bolt with a hot air blower releases the locking effect of the locking compound.]
5. ⚠ Cover lines, cables, connections and control units in the vicinity of the engine control unit to prevent damage through heat. — Turn potentiometer for temperature adjustment (2) to maximum heater output (600 °C).

6. Set two-stage switch for air quantity (3) to position 3.
7. ⚠ When shear-head bolts are heated up, parts of the protective housing will be subjected to a large amount of heat. Wear protective gloves to avoid injury. — Move nozzle of hot air blower towards shear-head bolt.
8. Switch hot air blower on and heat bolts.
9. Unscrew bolts using grip pliers. [Note: If the bolts cannot be unscrewed, saw into the heads of the shear-head bolts so that 2 parallel slots are created (arrows). Then unscrew.]
10. Insert screwdriver (A) between protective housing and retaining plate (arrow).
11. Using screwdriver (A), lever protective housing up and pull off to side from retaining plate (arrow).
12. Release and detach front connector (1) from engine control unit.
13. Lever up catch (2) slightly.
14. Then push engine control unit out of retainer (arrow).
15. Release and detach rear connector from engine control unit.
16. Connect and lock rear connector to engine control unit.
17. Push engine control unit onto retaining plate.
18. Connect and lock front connector to engine control unit.
19. Push protective housing onto retaining plate.
20. Evenly tighten shear-head bolts (1) until bolt heads shear off.
21. Fit windscreen wiper arms Electrical system92Windscreen wiper system; Removing and installing windscreen wiper arms.
22. Install plenum chamber cover General body repairs, exterior50Bulkhead; Removing and installing plenum chamber cover.
23. Install plenum chamber bulkhead General body repairs, exterior50Bulkhead; Assembly overview - bulkhead.

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