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Engine cooling > < Removing and installing oil pump

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  Voltage tester -V.A.G 1527 B-
t  Auxiliary measuring set -V.A.G 1594 C-

Test prerequisites
l  Engine oil level OK.
l  Engine oil temperature at least 80°C (radiator fan must have run once).
  Note
Functional check and repair of the optical and acoustic oil pressure display: Current flow diagrams → vehicle diagnosis tester “Functions and component selection”.
Test sequence
   
–  Remove oil pressure switch -F1- and screw into tester.
–  Screw tester into oil filter bracket in place of oil pressure switch.
–  Connect brown wire of tester to earth (-).
–  Connect voltage tester -V.A.G 1527 B- to battery positive (+) and oil pressure switch using cable from 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 increase engine speed. At 1.2…1.6 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 between 2.7…4.5 bar.
At higher engine speeds, the oil pressure must not exceed 7.0 bar.
If the specification is insufficient:
–  Check strainer in oil suction pipe for contamination/soiling → Item.
  Note
Mechanical damage, e.g. to bearings, could also be the cause for oil pressure being too low.
If no fault is found:
–  Renew oil pump → Chapter.
If the specification is exceeded:
–  Check oil channels.
–  If necessary, renew oil filter bracket with pressure relief valve.
  V17-0540

Engine cooling > < Removing and installing oil pump