Removing and installing engine (motor) control unit J623, with protective housing — VW

🧭 Before you start

Fits: platform code BE1

• Renewed: shear bolts

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• The threads of the shear bolts are secured with locking fluid. To unscrew these bolts, they must therefore be heated with the hot air blower.
• When doing this, ensure that lugs of engine (motor) control unit (1) engage in notches at top and bottom of bracket (B).
• It is essential that the engine (motor) control unit J623 be provided with the protective housing again.Always use new shear bolts.

📋 Procedure

1. Switch on ignition , and select following menu options on vehicle diagnostic tester:
2. Switch off ignition and remove ignition key.
3. Disconnect battery prior to removing engine (motor) control unit from its bracket Electrical system27Battery; Disconnecting and connecting battery.
4. Make groove (for a screwdriver) in head of shear bolt (1) using a small grinder (2). [Note: The threads of the shear bolts are secured with locking fluid. To unscrew these bolts, they must therefore be heated with the hot air blower.]
5. Set potentiometer for temperature adjustment (2) to maximum heater output.

6. Set two-stage switch for air flow rate (3) to position 3.
7. Heat head of shear bolt (1) for approx. 20 to 30 seconds.
8. Unscrew shear bolt (1) with screwdriver (2).
9. Remove protective housing from engine (motor) control unit J623.
10. Release engine (motor) control unit J623 in (direction of arrow A).
11. Swing out engine (motor) control unit J623 in (direction of arrow B), and remove it from bracket.
12. Release and pull off connectors for engine (motor) control unit J623. [Note: When doing this, ensure that lugs of engine (motor) control unit (1) engage in notches at top and bottom of bracket (B).]
13. Insert (A) lower edge of engine (motor) control unit J623(1) into bracket (2), and engage upper edge of engine (motor) control unit in bracket. [Note: It is essential that the engine (motor) control unit J623 be provided with the protective housing again.Always use new shear bolts.]
14. Clean threaded holes for shear bolts from locking fluid residue. Threads can be cleaned using a thread tap.
15. Connect battery Electrical system27Battery; Disconnecting and connecting battery.
16. Switch on ignition , and select following menu options on vehicle diagnostic tester:

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