Oil Pressure Sender: Testing and Inspection

Oil pressure and oil pressure switch, checking





Special tools and equipment required

^ Oil pressure tester V.A.G. 1342
^ Adapter V.A.G. 1342/14
^ Voltage tester V.A.G. 1527 B
^ Adapter set V.A.G. 1594 A
^ Assembly tool T10118

Conditions

^ Oil level OK
^ Engine oil temperature approx. 80 degrees C
^ Message "OK" must light up in driver information display

Work sequence





- Remove bolt -1- and remove cover over coolant expansion tank (arrow).





- To release tension of poly V-belt, screw an M8 x 40 bolt (arrow) into bore on tensioning element.

Note:
Mark the rotation direction of the poly V-belt with chalk or a felt-tipped pen. If the belt runs in the opposite direction when it is reinstalled, breakage may result.





- Disconnect secondary air hose at position marked with an arrow.
- Move air hose clear.





- Remove fasteners -1... 3- and remove sound insulation.





- Remove left sound insulation (arrows).





- Remove right sound insulation (arrows).





- Remove cross piece (arrows).
- Unbolt pulley for power steering pump (counterhold with mandrel).





- Remove bolts securing power steering pump to bracket (arrows).
- Hang power steering pump on lock carrier with hydraulic hoses -1- and -2- attached.





- Disconnect electrical connector -1- at Secondary Air Injection (AIR) pump motor -V101-.
- Move wire clear.
- Remove bracket -2- for coolant hose.
- Remove bracket -3- for secondary air pump air filter.





- Remove bolts -1- and -2- and remove secondary air injection pump with bracket -A-.





- Disconnect electrical connector (arrow) at oil pressure switch using assembly tool T10118.
- Unscrew oil pressure switch.





- Connect oil pressure tester V.A.G. 1342 with adapter V.A.G. 1342/14 to bore 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 Ground (-)
- Connect voltage tester V.A.G. 1527 B with test leads from adapter set V.A.G. 1594 A to oil pressure switch and battery positive (+)

^ LED must not light up

If the LED lights up:

- Replace oil pressure switch.
- Install power steering pump

- Install poly V-belt

Note:
Observe oil pressure tester and LED while starting. Switching point of oil pressure switch may already be exceeded when starting.

- Start engine.

^ Test lamp must light up at 1.2... 1.6 bar

If the LED does not light up:

- Replace oil pressure switch.

Checking oil pressure

- Install power steering pump
- Install poly V-belt.
- Start engine.
^ Minimum oil pressure at idling speed: 2.0 bar
^ Minimum oil pressure at 2000 RPM: 3.0 bar
^ Oil pressure at higher engine speeds: max. 7.0 bar

The pressure relief valve or oil pump is faulty if the specifications are not attained.

- Replace oil pump.

Assembling

Assembly is performed in the reverse order. Note the following:

- Install secondary air injection pump.
- Install power steering pump

- Install cross piece.

- Install poly V-belt.