Checking cold start and warm-up enrichment: VW (PN)
Step-by-step checking cold start and warm-up enrichment for the VW (PN): 11 steps. 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 codes 1G1, 1G2
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- Disconnect connector for Lambda probe G39 (connector on green or black lead to control unit must not be connected to earth).
- Set digital potentiometerV.A.G 1630 to 15 kΩ. Air flap must swivel in closing direction and CO content must increase to over 3 Vol. %.
🔧 Engine codes this applies to
📋 Procedure
- Remove air filter and seal vacuum connection for temperature regulator on carburettor with cap.
- Connect ignition testerV.A.G 1767 with pick-up clampV.A.G 1367/8 with ignition switched off.
- Connect CO testerV.A.G 1363A with hose adapterV.A.G 1363/3 to CO measuring tube.
- Pull connector from coolant temperature sender G62.
- Set digital potentiometerV.A.G 1630 to 1 kΩ and connect to disconnected connector with auxiliary measuring setV.A.G 1594C.
- Start engine and run at idling speed.
- Disconnect connector for Lambda probe G39 (connector on green or black lead to control unit must not be connected to earth).
- Set digital potentiometerV.A.G 1630 to 15 kΩ. Air flap must swivel in closing direction and CO content must increase to over 3 Vol. %.
- Carry out electrical test, test step 6 ; if necessary, renew coolant temperature sender G62 (reduce cooling system pressure beforehand).
- Carry out electrical test, test steps 8 and 9 .
- Check air flap positioner V63/air flap ; if necessary, renew Ecotronic control unit J184.
Other VW procedures
- Checking voltage supply – VW Jetta VI / Golf V / Jetta
- Checking transistorized ignition system with Hall sender switch unit N41
- Checking throttle valve positioner V60 fuel cut-off and starting function
- Checking centrifugal advance with TDC sender – VW PN
- Checking vacuum advance – VW PN
- 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.