Volkswagen Workshop Service and Repair Manuals

Special tools, workshop equipment, test and measuring appliances and auxiliary items required

• ◆ V.A.G 1342 Oil pressure tester
• ◆ V.A.G 1527 B Diode test lamp
• ◆ V.A.G 1594 A Adapter set

Function of the dynamic oil pressure warning indicator

When not under pressure, the oil pressure switch is open and will close when the operating pressure is attained.

The oil pressure warning will be activated
     approx. 10 seconds
after switching the ignition on.

Switch-in delay of oil pressure warning
     approx. 3 seconds.

Switch-off delay of oil pressure warning
     approx. 5 seconds.

Checking warning lamp

After switching on the ignition and engine not started the oil pressure warning lamp in dash panel insert must light for
     approx. 3 seconds
and then go out. The test will be terminated if the engine is running.

Criteria for warning

The optical oil pressure warning switches on (the oil pressure warning lamp flashes) and the buzzer sounding three times for the acoustical warning under one of the following conditions.

• ● "Ignition on", engine stationary, oil pressure switch closed
• ● Engine speed above 1500 rpm, oil pressure switch open

Notes:

If the oil pressure switch is closed, the warning lamp will remain switched on if the engine speed is above 5000 rpm. The warning lamp will be switched off again if the engine speed is below 5000 rpm.

If the oil pressure switch is open for 0.3 ... 3.0 seconds when the engine speed is above 1500 rpm, it will be stored in the combi-processor in the dash panel insert. If this condition occurs three times when the engine is running, the oil pressure warning will be activated and will not be cancelled even below 1500 rpm.

The oil pressure warning will be cancelled when the oil pressure switch is closed for longer than 5 seconds at an engine speed above 1500 rpm or when the ignition is switched off.

Test conditions

• ● Engine oil level OK, checking
• ● Oil pressure warning lamp (K3) must light up for approx. 3 seconds when ignition is switched on
• ● Engine oil temperature at least 80 °C (radiator fan must have run once)

Test sequence

• ‒ → Remove oil pressure switch (F1) and screw into tester.
• ‒ Screw tester into the cylinder head in place of the oil pressure switch.
• ‒ Connect brown wire of tester to earth (-).
• ‒ Connect diode test lamp V.A.G 1527 B using aux. cables from V.A.G 1594 A to battery positive (+) and oil pressure switch.
• ‒ If the LED lights up, renew oil pressure switch (F1) .

If the LED does not light up:

• ‒ Start engine and increase speed slowly.
  At
       0.3...0.6 bar
  the LED must light up; otherwise renew oil pressure switch.
• ‒ Increase engine speed further.
  At 2000 rpm and an oil temperature of 80 °C the oil pressure should be at least 2.0 bar.

At higher engine speed the oil pressure must not exceed 7.0 bar.