skoda Workshop Repair Guides

Skoda Workshop Service and Repair Manuals

ABOUT US
Engine cooling > < Removing and installing oil pump

Fabia Mk1

Testing oil pressure and oil pressure switch
Testing oil pressure and oil pressure switch
Special tools and workshop equipment required
t  Oil pressure tester, e.g. -V.A.G 1342-
t  Voltage tester, e. g. -V.A.G 1527 B-
t  Adapter cable set, e.g. -V.A.G 1594 A- or -V.A.G 1594 C-
t  Current flow diagram
Function of dynamic oil pressure warning system if oil pressure low
The oil pressure switch is opened when pressureless and closed when the switching pressure is reached.
The oil pressure warning is activated for about 10 seconds after the ignition is switched on („terminal 15 on“).
Activation delay of oil pressure warning system: approx. 3 s.
De-activation delay of oil pressure warning system: approx. 5 s.
Test pressure warning light
After the ignition is switched on and the engine is not running, the oil pressure warning light in the dash panel insert must come on for about 3 s and then go out. The check is ended when the engine is started.
Warning criteria
The visual oil pressure warning is switched on (oil pressure warning light flashes) and the warning buzzer sounds 3 times as an audible warning if at least one of the following conditions exists:
t  „Ignition on“, engine not running, oil pressure switch closed
t  Engine speed greater than 1500 rpm, oil pressure switch open
–  At an engine speed above 5000 rpm, the oil pressure warning is also not cancelled if the oil pressure switch is closed. The oil pressure warning is cancelled once engine speed is below 5000 rpm.
–  If the oil pressure switch is opened for only 0.5…3 seconds at an engine speed of more than 1500 rpm, this is stored in the dash panel insert. If this situation occurs 3 times when the engine is running, the oil pressure warning is immediately activated and is also not cancelled below 1500 rpm. The oil pressure warning is cancelled if the oil pressure switch is closed for more than 5 s at a speed of more than 1500 rpm, or at „Ignition off“.
Test conditions
l  Engine oil level o.k., test → Chapter.
l  Oil pressure warning light -K3- must come on for about 3 seconds when the ignition is switched on.
l  Engine oil temperature at least 80 °C (radiator fan must have run at least once).
Testing oil pressure switch
Detach cable from oil pressure switch.
   
–  Unscrew oil pressure switch and screw in oil pressure tester, e.g. -V.A.G 1342-.
–  Screw oil pressure switch -2- into the test equipment -V.A.G 1342-.
–  Connect brown cable -1- of tester to earth (-).
–  Connect voltage tester, e.g. -V.A.G 1527 B-, to oil pressure switch -2- and to battery positive (+).
The LED must not light up. If the LED lights up:
–  Replace oil pressure switch.
–  Start engine and slowly increase engine speed.
–  Given an oil pressure of 0.03…0.06 MPa (0.3…0.6 bar) the LED must light up, otherwise replace the oil pressure switch.
Testing oil pressure
–  Unscrew oil pressure switch and -V.A.G 1342- scew in.
–  Screw oil pressure switch into -V.A.G 1342-.
–  Start engine (engine oil temperature at least 80°C).
l  Oil pressure at 2000 rpm: min. 0,2 MPa (2 bar).
l  At a higher engine speed the oil pressure must not be greater than 0,6 MPa (6 bar).
If the specified value is not reached:
–  Eliminate any mechanical damage, e.g. bearing damage.
–  Replace oil pump with pressure relief valve → Chapter.
If the specified pressure is exceeded:
–  Inspect oil galleries.
–  Replace the oil pump with the pressure relief valve as required → Chapter.
  A17-0025

Engine cooling > < Removing and installing oil pump