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| Insert engine control unit into control unit retainer on plenum chamber bulkhead until it engages audibly in catch -1-. |
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| Insert wiring into wiring guide -1- and close guide. |
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| If engine control unit -J623- is renewed, erase learnt values and adapt engine control unit → Vehicle diagnostic tester„Guided functions“. |
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| The readiness code must be generated if the fault memory has been erased. |
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| Read control unit fault memory again. |
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