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Engine cooling > < Removing and installing oil pan

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: about 3 seconds. De-activation delay of the oil pressure warning system: about 5 seconds.
Test 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:
l  „Ignition on“, engine not running, oil pressure switch closed.
l  Engine speed above 1500 rpm, oil pressure switch open.
–  At an engine speed above 5000 rpm-1, the oil pressure warning is not cancelled; not even if the oil pressure switch is closed. The oil pressure warning is cancelled below 5000 rpm-1.
–  If the oil pressure switch is open for only 0.5...3 s at an engine speed above 1500 rpm, this is stored in the combination processor of the dash panel insert. If this condition occurs 3 times when the engine is running, the oil pressure warning is immediately activated and is not cancelled below 1500 rpm-1. The oil pressure warning is cancelled once the oil pressure switch is closed for more than 5 seconds at an engine speed of more than 1500 rpm-1, or if the „ignition is switched off“.
Test conditions
l  Engine oil level o.k., test → BookletFabia.
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 once).
Test sequence
–  Unplug connector from oil pressure switch.
   
–  Unscrew oil pressure switch and screw in the oil pressure tester.
–  Screw oil pressure switch -2- into the test equipment.
–  Connect brown cable -1- of tester to earth (-).
–  Connect voltage tester to oil pressure switch -2- and to the battery positive (+).
The LED must not light up. If the LED lights up:
–  Replace oil pressure switch.
–  Start engine and slowly increase engine speed.
–  At a pressure of 0.055 to 0.085 MPa (0.55 to 0.85 bar) the LED should light up. The oil pressure switch must be replaced if it does not come on.
–  Increase engine speed further.
At an engine speed of 2000 rpm and an oil temperature of 80 °C the oil pressure should be at least 0.2 MPa (2 bar).
–  At a higher engine speed the oil pressure must not be greater than 0.7 MPa (7 bar). Otherwise the oil filter holder with pressure valve must be replaced.
  A17-0025

Engine cooling > < Removing and installing oil pan