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A4 Mk1

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 1527 B-
t  Auxiliary measuring set -V.A.G 1594 C-

   
Procedure
l  Oil level OK
l  Engine oil temperature approx. 80 °C
–  Remove noise insulation -arrows-.
  A10-0018
–  Unplug electrical connector -arrow- at oil pressure switch.
–  Unscrew oil pressure switch.
  A17-0258
–  Connect oil pressure tester -V.A.G 1342- to threaded hole for oil pressure switch.
–  Screw oil pressure switch -2- into oil pressure tester -V.A.G 1342-.
Checking oil pressure switch
–  Connect brown wire -1- of oil pressure tester to earth “(–)”.
–  Connect voltage tester -V.A.G 1527 B- with test leads from auxiliary measuring set -V.A.G 1594 C- to oil pressure switch and battery positive “(+)”.
l  LED should not light up.
If the LED lights up:
–  Renew oil pressure switch.
–  Start engine.
  Note
Observe tester and LED while starting, as switching point of oil pressure switch may already be exceeded when starting.
Black oil pressure switch:
l  LED should light up at 1.2 ... 1.6 bar.
White oil pressure switch:
l  LED should light up at 1.6 ... 2.0 bar.
All models:
If LED does not light up:
–  Renew oil pressure switch.
Checking oil pressure
–  Start engine.
l  Minimum oil pressure at idling speed: 1.5 bar.
l  Minimum oil pressure at 2000 rpm: 2.5 bar.
The pressure relief valve or oil pump is defective if the specifications are not attained.
–  Renew oil pump → Chapter or → Chapter.
Assemble in reverse order.
  A17-0025

Engine oil > < Renewing oil retention valves