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Home >> Volkswagen >> 2004 >> Passat Sedan 4Motion (3B3) W8-4.0L (BDP) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Service and Repair >> With Manufacturer's Scan Tool
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With Manufacturer's Scan Tool



Engine Control Module (ECM), Replacing

Work sequence
- Print out control module identification of old engine control module, Engine control module DTC memory, checking and erasing.


NOTE: If the control module version installed in the vehicle is not displayed, replace the engine control module. Current engine control module part number.


- Switch off ignition.
- Remove wiper arms and cowl panel.







- Remove screws at cover of protective housing for control modules - arrows - and remove cover.







- Carefully pry off retainer bar with a screwdriver - arrow -.
- Release and pull off electrical connector for engine control module.
- Remove old engine control module and insert new one.
- Connect electrical connector and latch into place.
- Adapt new engine control module. "Guided fault function."