Removing and installing engine control unit J623 (Polo) — VW

🧭 Before you start

Fits: VW Polo 6R (2009–2014)

Don't miss

• The readiness code must be generated if the event memory has been cleared.

🔧 Engine codes this applies to

📐 60 workshop diagrams for CAVA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Switch off ignition.
2. Remove air filter Removing and installing air filter housing.
3. Release connectors from engine control unit and pull off.
4. Press clips (arrows A) outwards and pull engine control unit out to side (B).
5. Insert new engine control unit and press it to left.

6. Connect connectors and lock.
7. If engine control unit J623 is renewed, erase learnt values and adapt engine control unit "“Guided functions”".
8. Read event memory, rectify any faults and then clear event memory "“Guided Fault Finding”".
9. The readiness code must be generated if the event memory has been cleared.
10. Install air filter Removing and installing air filter housing.
11. Perform road test.
12. Again read control unit event memory.

Other VW procedures

• Checking fuel tank breather, engine codes CDLG, CAVB, CAVC, CAVD, CBZA, CBZB, CTHD, CTKA
• Removing and installing charge air cooler (Sharan) – VW 1.4
• Removing and installing regulating flap control unit J808 and throttle valve module J338
• Assembly overview - cylinder block, belt pulley end
• Removing and installing engine control unit J623 with protective housing (Eos► 10.2008)
• 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