Removing and installing engine control unit J623 (Golf Plus, Touran) — VW
Removing and installing engine control unit J623 (Golf Plus, Touran) on VW: 16 steps, 4 torque figures, engines BLG, BMY, CAVA, CAVB.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Touran I (1T, 2003–2015); platform code 521
Don't miss
- The readiness code must be generated if the event memory has been cleared.
🔩 Torque settings
Values can differ between engine variants — check the code stamped on your block.
| Torque | Fastener / step |
|---|---|
| 10 Nm (7.4 lb-ft) | Tighten bolts (arrows) |
| 10 Nm (7.4 lb-ft) | Tighten securing bolts (arrows) |
| 5 Nm (3.7 lb-ft) | Tighten bolts (arrows) |
| 5 Nm (3.7 lb-ft) | Tighten securing bolts (arrows) |
ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.
📐 38 workshop diagrams for BLG
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Switch off ignition.
- Remove plenum chamber bulkhead General body repairs50Body - front; Plenum chamber bulkhead.
- Loosen securing bolts (arrows) of control unit cover.
- Loosen securing nuts (arrows) of control unit bracket.
- Release connectors from engine control unit and pull off.
- Press catches (1) and (2) outwards. Then pull engine control unit off control unit bracket in (direction of arrow).
- Push engine control unit onto control unit bracket until it engages in catches.
- Attach connectors to engine control unit and lock.
- Tighten bolts (arrows) to 10 Nm. — 10 Nm (7.4 lb-ft)
- Tighten bolts (arrows) to 5 Nm. — 5 Nm (3.7 lb-ft)
- If engine control unit J623 is renewed, erase learnt values and adapt engine control unit "“Guided functions”".
- Read event memory, rectify any faults and then clear event memory "“Guided Fault Finding”".
- Install plenum chamber bulkhead General body repairs50Body - front; Plenum chamber bulkhead.
- The readiness code must be generated if the event memory has been cleared.
- Perform road test.
- Again read control unit event memory.
Ask TorqFix about your VW BLG — 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 BLG — free → or sign up free to see the drawingsOther VW procedures
- Checking fuel pressure in high-pressure section – VW 1.4 · 3 torque figures
- Removing and installing charge air cooler – VW CC · 2 torque figures
- Renewing Teflon seal and support washer on injector · 2 torque figures
- Removing and installing high-pressure pump, engine codes BLG and BMY · 2 torque figures
- Removing and installing air filter – VW · 3 torque figures
- Removing engine · 41 torque figures
- Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
- Adjusting valve timing – VW Passat B5 · 83 torque figures
- Removing and installing camshafts – VW Passat B6 · 39 torque figures
- Removing and installing coolant pump · 53 torque figures
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.