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Golf Mk5

Checking oil pressure and oil pressure switch
   
Checking oil pressure and oil pressure switch
Special tools and workshop equipment required
t  Oil pressure tester -V.A.G 1342-
t  Voltmeter -V.A.G 1527/B-
t  Auxiliary measuring set -V.A.G 1594/A- or auxiliary measuring set -V.A.G 1594/C-

Test prerequisites
l  Engine oil level OK, checking → Fig.
l  Engine oil temperature at least 80 °C (radiator fan must have run once)
  Note
Functional check and repair of the visual and acoustic oil pressure warning → Current flow diagrams, Electrical fault finding and Fitting locations.
Test procedure
   
–  Remove oil pressure switch -F1- and screw it into tester.
–  Screw tester into oil filter bracket in place of oil pressure switch.
–  Connect brown wire of tester to earth (-).
–  Connect voltmeter -V.A.G 1527/B- to battery positive (+) and oil pressure switch using cables from auxiliary measuring set -V.A.G 1594/A- or auxiliary measuring set -V.A.G 1594/C-. LED must not light up.
–  If the LED lights up, renew 1.4 bar oil pressure switch -F1-.
If LED does not light up:
–  Start engine and run at idling speed. At 1.2...1.6 bar, the LED must light up. Otherwise replace oil pressure switch.
–  Increase engine speed further. At 2000 rpm and at an oil temperature of 80° C, the oil pressure should be between 2.7...4.5 bar.
At higher engine speeds, the oil pressure must not exceed 7.0 bar.
If the specifications are not obtained:
–  Check strainer in suction line for dirt → Item.
  Note
Mechanical damage, e.g. to bearings, could also be the cause behind the oil pressure being too low.
–  If necessary, renew oil filter bracket with pressure relief valve → Item or oil pump.
If the specification is exceeded:
–  Check oil channels.
–  If necessary, replace oil filter bracket with pressure relief valve → Item.
  V17-0540

Engine cooling > < Installing