Removing and installing engine control unit J623 with protective housing, CC from 11.2010 — VW
Removing and installing engine control unit J623 with protective housing, CC from 11.2010 on VW: 17 steps, engines CFFA, CFFB, CFFD, CFGB.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Passat CC (357, 2008–2012)
📐 50 workshop diagrams for CFFA
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Switch off ignition.
- Remove windscreen wiper arms Electrical system92Windscreen wiper system; Removing and installing windscreen wiper arms
- Remove plenum chamber bulkhead General body repairs, exterior50Bulkhead; Assembly overview - bulkhead.
- Push down retaining frame in direction of (arrow) and remove engine control unit.
- Unscrew shear-head bolts (arrow) using a pair of pliers.
- Insert screwdriver between the two locking plates (arrow).
- Carefully press screwdriver in (direction of arrow) and bend retaining bar (1) upwards at the same time.
- Bend retaining bar (1) in direction of (arrow) until it can be pulled off connector.
- Push locking devices of connectors in (direction of arrow) and pull off connectors.
- Fit connectors to engine control unit and push locking devices to stop in (direction of arrow).
- Fit retaining bar (1) onto connectors and press it in direction of (arrow).
- Guide pin (2) to stop into hole on valve timing housing.
- Use new shear-head bolts to secure retaining bar onto engine control unit (arrows).
- Evenly tighten shear-head bolts until bolt heads shear off (arrows).
- Place engine control unit into retaining frame and push retaining frame upwards in direction of (arrow).
- Install plenum chamber bulkhead General body repairs, exterior50Bulkhead; Assembly overview - bulkhead.
- Fit windscreen wiper arms Electrical system92Windscreen wiper system; Removing and installing windscreen wiper arms.
Ask TorqFix about your VW CFFA — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.
Ask about your VW CFFA — free → or sign up free to see the drawingsOther VW procedures
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.