Removing and installing engine control unit J623 with metal locking plate, 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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• 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.
• The metal locking plate must always be re-fitted on the engine control unit J623.

🔧 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.
3. Release retaining clip (arrow) and take out engine control unit J623.
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, the threads must therefore be heated with the hot air blower.]
5. 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.

6. Hold hot air blowerVAS 1978/14A with nozzle attachment (arrow) to thread of shear bolt and heat thread for about 20 to 30 seconds.
7. Unscrew shear bolt (1) using screwdriver (2).
8. Detach metal locking plate from connectors for engine control unit J623.
9. Release and unplug connectors.
10. The metal locking plate must always be re-fitted on the engine control unit J623.
11. Remove any locking compound residue from the threaded holes for the shear bolts. Threads can be cleaned using a thread tap.
12. Use new shear-head bolts.
13. Connect vehicle diagnostic tester.
14. Activate engine control unit with the function "“Replace engine control unit”" on vehicle diagnostic tester in "“Guided functions”" mode.

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