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| Release retaining tabs -arrows- and unplug connectors -1 and 2- from engine control unit. |
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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 locking plate 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. |
The procedure required after connecting the new engine control unit is described in the Guided Fault Finding or Guided Functions. |
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| Activate engine control unit on vehicle diagnosis and service information system -VAS 5052- in „Guided Functions“ mode, „J623 - Renew engine control unit, further steps“. |
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| The injector delivery calibration and the injector voltage calibration must additionally be re-adapted in the engine control unit -J623- after the control unit has been renewed (these functions influence engine power and exhaust emissions). |
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| On vehicles with particulate filter the current mileage (km) reading must be stored in the engine control unit via an adaption procedure. |
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