Removing and installing engine control unit J623 with protective housing, Golf, Golf Estate, Golf SV — VW

🧭 Before you start

Fits: VW Golf VII Variant (BA), VW Golf Sportsvan (AM1, 2014–2020), VW Golf VII (5G, 2012–2020)

• Renewed: engine control unit, shear-head bolts

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• Cover the area around the engine control unit, and protect it from flying sparks.
• The threads of the shear bolts are secured with locking fluid. To unscrew these bolts, the threads must therefore be heated with the hot air blower.

🔧 Engine codes this applies to

📋 Procedure

1. If engine control unit is renewed, select test sequence/function Replace engine control unit on "“vehicle diagnostic tester”" in "“Guided functions”" mode.
2. Switch off ignition and remove ignition key. [Note: Cover the area around the engine control unit, and protect it from flying sparks.]
3. 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, the threads must therefore be heated with the hot air blower.]
4. Set the hot air blower as shown in illustration. Meaning potentiometer for temperature regulation (2) set to maximum heating power and 2-stage switch for air volume (3) set to position 3.
5. Heat head of shear bolt (1) for approx. 20 to 30 seconds.

6. Unscrew shear bolt (1) using screwdriver (2).
7. Release fastener (arrow) and detach engine control unit (1).
8. Release and unplug connectors for engine control unit J623.
9. It is essential that the engine control unit J623 be provided with the protective housing again.
10. Remove any locking compound residue from the threaded holes for the shear bolts. Threads can be cleaned using a thread tap.
11. Use new shear-head bolts.
12. Connect vehicle diagnostic tester.
13. Activate engine control unit with the function "“Replace engine control unit”" on vehicle diagnostic tester in "“Guided functions”" mode.

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