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Engine cooling > < Removing and installing oil pressure switch for reduced oil pressureF378

Golf Mk6

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 1527B-
t  Auxiliary measuring set -V.A.G 1594C-
t  Jointed wrench 24 mm -T40175-

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 diagnostic tester„Functions and component selection“.
Checking oil pressure:
   
–  Only vehicles with sound generator: Open catch -1-, unclip fuel line -2- and loosen bolt -3- on activated charcoal filter. Place charge air pipe to one side.
  N21-10197
–  Pull off breather line -1-, release activated charcoal filter -A- and remove upwards -B-. Lay activated charcoal filter to side.
  Note
Place a cloth underneath bracket for ancillaries to catch any escaping oil.
  N13-10335
–  Separate electrical connector -2- on oil pressure switch for reduced oil pressure -F378- (brown).
–  Unscrew oil pressure switch for reduced oil pressure -F378--1-.
–  Screw oil pressure tester -V.A.G 1342- into oil filter bracket in place of oil pressure switch.
–  Screw oil pressure switch for reduced oil pressure -F378- in oil pressure tester -V.A.G 1342-.
–  Reconnect charge air pipe and breather line for activated charcoal filter.
–  Start engine.
l  Oil pressure at idling speed: 1.2…2.1 bar.
l  Oil pressure at 2000 rpm: 1.6…2.1 bar.
l  Oil pressure at 3700 rpm: 3.0…4.0 bar.
  Note
During the first 1000 km the oil pressure could be 3.0 to 4.0 bar at 2000 rpm.
If specification is not attained:
–  Check strainer in oil suction pipe for contamination/soiling → Item.
–  Check oil pressure control valve -N428- → Vehicle diagnostic tester.
  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.
Check oil pressure switch for reduced oil pressure -F378- (brown):
–  Stop engine.
  A17-10458
–  Connect brown wire of tester to earth (-).
–  Connect voltage tester -V.A.G 1527B- to battery positive (+) and oil pressure switch for reduced oil pressure -F378- (brown) using cables from auxiliary test set -V.A.G 1594C-.
l  LED must not light up.
–  If LED lights up, replace oil pressure switch for reduced oil pressure -F378-.
If LED does not light up:
–  Start engine. At 0.55…0.85 bar, the LED must light up, otherwise renew oil pressure switch.
Checking oil pressure switch -F22- (blue):
–  Stop engine.
–  Connect voltage tester -V.A.G 1527B- to battery positive (+) and oil pressure switch -F22- (blue) using cables from auxiliary test set -V.A.G 1594C-.
l  LED must not light up.
–  If LED lights up, replace pressure switch -F22-.
If LED does not light up:
–  Start engine and increase engine speed. At 2.15…2.95 bar, the LED must light up, otherwise renew oil pressure switch.
  V17-0540

Engine cooling > < Removing and installing oil pressure switch for reduced oil pressureF378