Removing and installing engine control unit 2J624 (slave) — AUDI

🧭 Before you start

Fits: Audi A8 D3 (4E, 2002–2010)

• Renewed: engine control unit, shear bolts

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• The two shear bolts screwed into the engine control unit do not need to be heated. They can be removed without heating.
• After installation, the locking plate must be re-fitted on the engine control unit 2J624.

🔧 Engine codes this applies to

📐 1 workshop diagram for BGS

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. When renewing engine control unit, select diagnosis object "“Renew engine control unit”" in "“Guided Functions”". [Note: The engine control unit (1) is bolted to the protective housing (5). To make it more difficult to unscrew the shear bolts (4) for locking plate (2), their threads have been coated with locking fluid.The protective housing has to be removed before the connectors can be unplugged from the engine control unit (e.g. to connect the test box or renew the engine control unit).]
2. Switch off ignition and remove ignition key.
3. Remove cover from plenum chamber (right-side).
4. Carefully pull cowl panel grille (1) off retainer at windscreen (only pull off as far as necessary).
5. Detach cover (3) above engine control unit 2J624.

6. Remove engine control unit 2J624(1). Release retaining clip (1) and detach engine control unit 2J624 from guide (2).
7. ⚠ Heating the thread of the locking plate also heats up the shear bolts and parts of the metal housing. Take care to avoid burns. It is also important to ensure that only the thread is heated and none of the surrounding components if at all possible. These should be covered if necessary. — Unscrew shear bolts using vice-grip pliers (see arrow in illustration).
8. The two shear bolts screwed into the engine control unit do not need to be heated. They can be removed without heating.
9. Detach metal locking plate from connectors.
10. Unscrew two bolts securing retainers for engine control unit 2J624.
11. Release connectors on engine control unit 2J624 and unplug connectors.
12. Take out old engine control unit 2J624 and install new engine control unit J623.
13. After installation, the locking plate must be re-fitted on the engine control unit 2J624.
14. Clean threaded holes for shear bolts to remove any residue from locking fluid. This can be done using a thread tap.
15. Always use new shear bolts.
16. Carefully clip cowl panel grille into retainer at windscreen.

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