Oil Pressure Sender: Testing and Inspection

Oil pressure and oil pressure switch, checking
Special tools

Special Tools:

^ VAG 1342 Oil pressure tester
^ VAG 1527 B Voltage tester
^ VW 1594 Adapter kit

Oil pressure warning system, function
The oil pressure switch is open when no pressure is applied. The switch closes as soon as the specified pressure has been reached.
The oil pressure warning is activated approximately 10 seconds after the ignition is switched on.
The switch-on delay of the oil pressure warning is approximately 3 seconds.
The switch-off delay of the oil pressure warning is approximately 5 seconds.

Oil pressure switch, checking





- Remove 0.7 bar oil pressure switch -F1- (brown) and thread into tester.
- Thread tester into filter bracket in place of pressure switch.
- Connect brown tester wire to Ground.
- Connect VAG/527B voltage tester between battery B+ and oil pressure switch using bumper wires from VW 1594 adapter kit,
If LED lights up:
- Replace 1.4 bar oil pressure switch -F1- .
If LED does not light up:
- Start engine and run at idle.
^ At 0.55 to 0.85 bar the LED must light up. If not, replace 0.7 bar oil pressure switch -F1- .

Oil pressure, checking
Test conditions
^ Oil pressure tester VAG 1342 is still connected
^ Engine oil temperature at least 80°C (176°F).
^ Oil pressure tester VAG 1342 is still connected

Test sequence:
- Start engine and run at idle.
- Increase engine speed to approximately 2000 rpm.
^ Specified value: Oil pressure at least 2.5 bar
If the value is not reached:
- Replace oil filter bracket with oil pressure valve, or oil pump.
At higher rpm the oil pressure of 7.0 bar must not be exceeded.
- If necessary, replace oil filter bracket with oil pressure valve.