Oil Pressure Sender: Testing and Inspection

Oil pressure and oil pressure switch, checking





Special tools and equipment
^ V.A.G. 1342 Oil pressure tester
^ V.A.G. 1527 B Diode test lamp
^ V.A.G. 1594 A Adapter set

Test conditions
^ Engine oil level OK, checking, Refer to Engine Lubrication, Service and Repair
^ Engine oil temperature at least 80°C (coolant fan must have run once)

Note: Functional check and servicing the optical and acoustic oil pressure warning:
Electrical Wiring Diagrams, Troubleshooting & Component Locations

Test sequence





^ Remove oil pressure switch -F1- and thread into tester.
^ Thread tester into oil filter bracket in place of oil pressure switch.
^ Connect brown wire of tester to Ground (-).
^ Connect diode test lamp V.A.G. 1527 B using auxiliary cables from V.A.G. 1594 A to battery positive (+) and oil pressure switch.
LED must not light up.
^ If LED lights up, replace 1.4 bar oil pressure switch -F1-.
If the LED does not light up:
^ Start engine and increase revolutions slowly. At 1.2...1.6 bar LED must light up, otherwise replace oil pressure switch.
^ Increase engine speed further.
At 2000 rpm and an oil temperature of 80°C oil pressure must be between 2.7...4.5 bar
At higher engine speeds oil pressure must not exceed 7.0 bar.
If the specifications are not attained:
^ Correct mechanical damage, e.g. bearing damage.
^ Check O-ring of sealing plug for damage.
^ Replace oil filter bracket with pressure relief valve,or oil pump with balancer shaft gear assembly.
If the specification is exceeded:
^ Check oil galleries.
^ If necessary, replace oil filter bracket with pressure relief valve.