Oil Pressure Sender: Testing and Inspection
refer toOil pressure and oil pressure switch, checking
Special tools, equipment, test and, inspection devices; required accessories
Special Tools:
^ V.A.G 1342 Oil pressure tester
^ V.A.G 1527 B Diode test lamp
^ V.A.G 1594 A Supplemental measuring tool set
Function of the Dynamic Oil Pressure Warning System
The oil pressure switch is open without pressure and is closed when the operating pressure is reached.
The oil pressure warning is actuated approximately 10 seconds after the ignition is turned on.
Oil pressure warning turn-on delay: approximately 3seconds.
Oil pressure warning turn-off delay: approximately 5 seconds.
Checking the indicator light for operation with oil pressure
After the ignition is turned on, the indicator light (K3) in the instrument panel must light for approximately 3 seconds and then extinguish. The test ends when the engine starts running.
Warning criteria
Warning is provided both visually (blinking indicator light) and acoustically (buzzer sounds three times). This occurs under the following operational states:
^ Ignition ON, engine stopped, oil pressure switch closed
^ Engine speed above 1500/min, oil pressure switch open
Notes:
^ The indicator light is not switched off if the engine speed exceeds 5000 rpm, not even if the oil pressure switch is closed. The indicator light will be shut off again when the engine speed drops below 5000 rpm.
^ If the oil pressure switch is only opened for 0.5-3.0 seconds when the engine speed is over 1500 rpm, this fact will be stored in the instrument cluster processor. If this state occurs three times while the engine is running, the warning will be triggered and will not be cleared even under 500 rpm. The warning will be cleared when the oil pressure switch is closed for more than 5 seconds and the ignition is turned off.
Test conditions
^ Oil level OK (checking refer to, Fig. 2)
^ Indicator lamp for oil pressure (K3) must illuminate for approximately 3 seconds after the ignition is turned on.
^ Oil temperature at least 80°C
Oil pressure switch, checking
- Remove the 1.4 bar oil pressure switch (F1) (black insulation) and screw it into the tester.
- Screw the tester into the oil filter housing in place of the oil pressure switch.
- Ground the tester brown lead H.
- Connect the V.A.G 1527 B diode test lamp to the battery positive terminal (+) and to the oil pressure switch using the auxiliary cables from V.A.G 1594 A. The Light-Emitting Diode (LED) should not illuminate.
If the LED illuminates:
- Replace the 1.4 bar oil pressure switch (F1).
If the LED does not illuminate:
- Let the engine continue to idle. The light-emitting diode should light at 1.2-1.6 bar. Otherwise, replace the 1.4 bar oil pressure switch (F1).
Oil pressure, checking
Test condition
^ The VAG 1342 oil pressure test instrument is riot connected
^ Oil temperature at least 80°C
Test sequence
- Start the engine and let it idle.
Specification: oil pressure: at least 2.0 bar
- Increase engine speed.
^ The oil should be at least 2.0 bar at 2000 rpm and 80°C oil temperature.
^ The oil pressure may not exceed 7.0 bar
- Replace oil pump if necessary.