Checking commencement of injection valve N108 — VW
Checking commencement of injection valve N108 on VW: 11 steps, engines AGD, AHG, AKU. What to remove, in what order, and what to check after.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: platform code 6N1
- Special tools named: V.A.G 1598/18A
- Also covered elsewhere: Installation location overview, page
📋 Procedure
- Disconnect connector from injection pump .
- Measure resistance between connector contacts 2+3.
- Disconnect 10-pin connector ⇒ Installation location overview, page .
- Measure resistance between connector contacts 9+10.
- Renew commencement of injection valve N108
- Connect adapter cable, 68-pinV.A.G 1598/18A to control unit wiring harness.
- Check lines between adapter cable (68-pin)V.A.G 1598/18A and 3-pin connector for open circuit according to current flow diagram. Contact 2+socket 51 Contact 3+socket 68.
- Connect adapterV.A.G 1598/22 to control unit wiring harness.
- Check lines between adapterV.A.G 1598/22 and 10-pin connector for open circuit according to current flow diagram. Contact 9+socket 79 Contact 10+sockets 2+28.
- Also check wiring for short to one another, short to vehicle earth and short to battery positive.
- Renew diesel direct injection system control unit J248.
Other VW procedures
- Checking needle lift sender G80
- Removing and installing fuel tank with its attachments
- Checking brake light switch F and brake pedal switch F47
- Checking coolant temperature sender G62
- Checking intake manifold temperature sender G72
- 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.