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| The two shear bolts screwed into the engine control unit do not need to be heated. They should be removed without being heated. |
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| Detach protective housing from control unit connectors. |
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| Release connectors on engine control unit and unplug connectors. |
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| Take out old engine control unit -J623- and install new engine control unit -J623-. |
Installation is performed in the reverse sequence. |
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| After installation, the protective housing must be re-fitted on the engine control unit -J623-. |
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| Clean threaded holes for shear bolts to remove any residue from locking fluid. This can be done using a thread tap. |
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| Always use new shear bolts. |
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| Tightening torque for bolts securing cover of electronics box: 3.5 Nm. |
After installing a new engine control unit, the following operation must be performed: |
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| Activate engine control unit via a vehicle diagnostic tester in „Guided Functions“ mode, „Replace engine control unit“. |
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