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Removing and installing gearbox with balancing shafts and oil pump > < 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-
t  Voltage tester, e. g. -V.A.G 1527 B -
t  Measuring tool set, e.g. -V.A.G 1594 C -
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
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 at least one of the following conditions exists:
l  “Ignition on”, engine not running, oil pressure switch closed
l  Engine speed greater than 1500 rpm-1, 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 once engine speed is below 5000 rpm-1.
–  If the oil pressure switch is open for only 0.5 to 3 s at an engine speed above 1500 rpm-1, 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 s at an engine speed of above 1500 rpm-1, or if “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 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 diode test lamp (e. g. -V.A.G 1527-) to oil pressure switch -2- and battery positive (+).
The LED must not light up.
–  The oil pressure switch must be replaced if the LED lights up.
–  Start engine and slowly increase engine speed.
–  The LED must come on at an overpressure of 0.12 to 0.16 MPa (1.2...1.6 bar). The oil pressure switch must be replaced if it does not come on.
Testing oil pressure
–  Unscrew oil pressure switch and screw in the tester - V.A.G 1342-.
–  Screw oil pressure switch into the tester -V.A.G 1342 -.
–  Start engine (engine oil temperature at least 80°C).
t  Oil pressure when engine idling: at least 0,2 MPa (2 bar)
t  Oil pressure at 2000 rpm-1: 0.30 to 0.45 MPa (3...4.5 bar)
If the specified values are not reached:
–  Eliminate any mechanical damage, e. g. bearing damage.
–  Replace the oil filter holder with the pressure relief valve → Anchor, -pos. 14- or the oil pump → Anchor, -pos. 1-.
At a higher engine speed the oil pressure must not exceed 0.7 MPa (7 bar).
If the specified pressure is exceeded:
–  Inspect oil galleries.
–  Replace if necessary pressure relief valve in the oil filter holder → Anchor pos. 14.
  A17-0025

Removing and installing gearbox with balancing shafts and oil pump > < Removing and installing oil pan