Checking continued coolant circulation pump V51: Audi A6 C5 (AMK, AMU, APX, APY, …)
Step-by-step checking continued coolant circulation pump V51 for the Audi A6 C5: 15 steps. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A6 C5 (4B)
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- The test must be carried out within 15 minutes after switching off ignition.
- The continued coolant circulation pump runs very quietly. Avoid background noise whilst checking the pump. Call a second mechanic to check if necessary.
📋 Procedure
- Start engine.
- Perform a test drive as necessary.
- Switch off ignition. [Note: The test must be carried out within 15 minutes after switching off ignition.]
- Remove air cleaner housing (see the separate procedure).
- Listen for the sound of the continued coolant circulation pump operating (noise is audible in vicinity of intake manifold. [Note: The continued coolant circulation pump runs very quietly. Avoid background noise whilst checking the pump. Call a second mechanic to check if necessary.]
- Unplug electrical connector (arrow) at continued circulation coolant pump V51.
- Connect voltage tester V.A.G 1527B as follows:
- Check for open circuit to engine earth in wiring from contact 1 of connector.
- Eliminate open circuit in wiring (refer to current flow diagram).
- Connect voltage tester V.A.G 1527B as follows:
- Check wiring from contact 2 of connector to continued coolant circulation relay J151 for open circuit by referring to current flow diagram.
- Eliminate open circuit in wiring (refer to current flow diagram).
- Check continued coolant circulation relay J151.
- Renew continued coolant circulation pump V51.
- Install air cleaner housing (see the separate procedure).
Other AUDI procedures
- Removing and installing fuel tank with attached components
- Removing and installing radiator – Audi Q7 · 1 torque figures
- Separating centre and rear silencers · 5 torque figures
- Removing and installing coolant pipe – Audi A3
- Renewing valve stem oil seals – Audi A3
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 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 → · How these pages are made →Workshop data on this page last updated 20 Sep 2026.