Passat L4-1.8L Turbo (AWM) (2004)
Engine Control Module: Service and Repair
Engine Control Module (ECM), Replacing - II
Engine Control Module (ECM), Replacing
Work procedure
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First, print out the old control module identification, and thus also its coding. DTC memory of Engine Control Module (ECM), checking and
erasing.
NOTE: If the control module version that is appropriate for this vehicle is not indicated, replace the control module. For the current engine
control unit part number: Original parts distributor.
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Switch off ignition.
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Remove wiper arms and cowl.
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Remove cover of protective housing for control units.
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Carefully pry off the Retainer bar with a screwdriver - arrow -.
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Disengage connector from control module and then disconnect it.
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Remove old control module and install the new control module.
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Now the new control module must be coded, and the electronic anti-theft immobilizer and the Throttle Valve Control Module must be adapted.
Activate the cruise control system if necessary. Functions and components, adapting.
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Then, check DTC memory of new Engine Control Module (ECM) and erase if necessary. DTC memory of Engine Control Module (ECM),
checking and erasing.
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Carry out test drive.
Observe safety precautions that apply to road tests.
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Check DTC memory of control module again.