Checking oil pressure and oil pressure switch (engine code CNNA, BWS from 01.2011) — VW

🧭 Before you start

Fits: VW Passat CC (357, 2008–2012); platform code 1F7

• Renewed: oil pump

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• Observe installation position of adapter: the conical union of adapter must be screwed into pressure hose of tester.
• Connect voltage testerV.A.G 1527B with cables from auxiliary measuring setV.A.G 1594C to battery positive (+) (connection in engine compartment (arrow)) and oil pressure switch. LED must not light up.
• Observe tester and LED while starting, as switching point of oil pressure switch may already be exceeded when starting.
• Start engine and run at idling speed. At 0.7…1.1 bar the LED must light up; otherwise renew oil pressure switch F1.

🔧 Engine codes this applies to

📋 Procedure

1. Remove noise insulation General body repairs, exterior50Noise insulation.
2. Remove oil pressure switch F1 and screw into tester.
3. Screw tester into oil filter bracket in place of oil pressure switch. [Note: Observe installation position of adapter: the conical union of adapter must be screwed into pressure hose of tester.]
4. Connect brown wire of tester to earth (-).
5. Connect voltage testerV.A.G 1527B with cables from auxiliary measuring setV.A.G 1594C to battery positive (+) (connection in engine compartment (arrow)) and oil pressure switch. LED must not light up.

6. Renew oil pressure switch F1. [Note: Observe tester and LED while starting, as switching point of oil pressure switch may already be exceeded when starting.]
7. Start engine and run at idling speed. At 0.7…1.1 bar the LED must light up; otherwise renew oil pressure switch F1.
8. Check oil pressure at different revolutions:
9. Check strainer in oil suction pipe for dirt.
10. Check oil pressure safety valve control piston in oil pump for dirt.
11. Check oil pipe at bottom of cylinder block for leaks. [Note: Mechanical damage, e.g. to bearings, could also be the cause for oil pressure being too low.The oil pressure safety valve control piston is spring-loaded. Great care is therefore required when screwing the plug in/out.The plug is tightened to 35 Nm in oil pump.]
12. Renew oil pump .
13. Check oil channels.
14. If necessary, renew oil pump .

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