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Engine cooling > < Removing and installing oil pan

Octavia 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- with adapter -V.A.G 1342/14-
t  Voltage tester (e.g. -V.A.G 1527B-)
t  Car tool kit for wiring loom repair -V.A.G 1594C -
t  Current flow diagram.
Function of dynamic oil pressure warning system
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
  Note
This test is not applicable for vehicles with dot display.
After the ignition is switched on and engine not running, the oil pressure warning light in the dash panel insert must light up 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 buzzer sounds 3 times as an audible warning if one of the following conditions exists:
l  “Ignition on”, engine not running, oil pressure switch closed
l  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 to 3 sec. at an engine speed of more than 1500 rpm, this is stored in the combination processor of 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 an engine speed of 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 → Octavia.
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).
Testing oil pressure switch
–  Detach cable from oil pressure switch -F1-.
   
–  Unscrew oil pressure switch -F1- and screw in oil pressure tester (e. g. -V.A.G 1342 -).
–  Screw the oil pressure switch -F1--2- into the test equipment -V.A.G 1342-.
–  Connect brown cable -1- of tester to earth (-).
–  Connect diode test lamp (e.g. -V.A.G 1527B-) to oil pressure switch -F1--2- and battery positive (+).
l  The LED should not light up.
If the LED lights up:
–  Replace oil pressure switch.
–  Start engine and slowly increase engine speed.
  Note
Observe the testing equipment and the LED while actuating the starter since the switching point of the oil pressure switch can already be exceeded when starting up.
l  For an overpressure of 0.12 ... 0.16 MPa the LED should light up.
The LED does not light up:
–  Replace oil pressure switch.
Testing oil pressure
–  Unscrew the oil pressure switch -F1- and screw in the tester -V.A.G 1342-.
–  Screw the oil pressure switch -F1- into the tester -V.A.G 1342-.
–  Start engine (engine oil temperature at least 80°C).
t  Oil pressure when engine idling: at least 0.13 MPa
t  Oil pressure at 3500°rpm: at least 0.35 up to 0.45 MPa
If the specified values are not reached:
–  Replace pressure relief valve in the oil filter holder or the oil pump → Chapter.
  Note
Replace gasket ring for oil pressure switch -F1-.
  A17-0025

Engine cooling > < Removing and installing oil pan