Checking charge pressure sender G31: VW Sharan I / SEAT Alhambra 1.8 (AJH, AWC)
Step-by-step checking charge pressure sender G31 for the VW Sharan I / SEAT Alhambra 1.8 (AJH/AWC): 19 steps.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Sharan I / SEAT Alhambra (7M)
📋 Procedure
- Pull off 4-pin connector from charge pressure sender G31(arrow).
- To measure voltage, connect multimeter with auxiliary leads from auxiliary measuring setV.A.G 1594 A or auxiliary measuring setV.A.G 1594C to contacts 1 (earth) + 3 (positive) of charge pressure sender G31 connector.
- Switch on ignition. Specification: at least 4.5 V
- Switch off ignition.
- First check whether a coded radio is fitted. If so, obtain anti-theft coding.
- Remove battery.
- Connect adapter cable, 121-pinV.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.
- Check cables between test box and 4-pin connector for open circuit using current flow diagram.
- Also check wiring for short to one another, short to vehicle earth and short to battery positive. Specification: ∞ Ω.
- Check function .
- Renew engine control unit 24.
- Connect adapter cable, 121-pinV.A.G 1598/31 to engine control unit wiring harness and engine control unit.
- Connect battery.
- Reconnect 4-pin connector from charge pressure sender G31(arrow).
- To measure voltage, connect multimeter with adapter cables from auxiliary measuring setV.A.G 1594 A or auxiliary measuring setV.A.G 1594C to sockets 101 (positive) + 108 (earth).
- Start engine and measure voltage. Specification: 1.80…2.00 V
- Bring engine up to speed by accelerating spontaneously. Specification: 2.00…3.00 V
- Renew charge pressure sender G31.
- Interrogate fault memory and erase 01Reading and erasing fault memory.
Other VW procedures
- Checking oil pressure and oil pressure switch: engine code AWC
- Checking secondary air pump motor V101 – VW Golf IV / Bora
- Cylinder head
- Removing and installing parts of lubrication system
- Checking intake air system for leaks (unmetered air)
- 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.