Testing oil pressure and oil pressure switch — AUDI

AHU
Special tools and workshop equipment required

V.A.G 1342
V.A.G 1527 B
V.A.G 1594 A

Requirements for test:

Oil level ok.
Oil pressure warning lamp -K3 must come on when ignition is switched on.
In vehicles with auto-check system the "OK" display must appear (call up symbol).
Engine oil temperature approx. 80 °C

Testing warning lamp

The oil pressure warning lamp lights up when the ignition is switched on ("terminal 15 on") with the engine not running (this does not apply to vehicles with auto-check system).

Testing oil pressure switch 0.3 bar (brown) or 0.25 bar (blue)

Fitting location: at top of oil filter bracket

Disconnect wire from oil pressure switch.
Unscrew oil pressure switch and screw in oil pressure tester V.A.G 1342.
Screw oil pressure switch -2- intoV.A.G 1342.
Connect brown wire -1- of tester to earth (-).

Connect voltage tester V.A.G 1527 B to oil pressure switch and positive side of battery (+) using test leads from V.A.G 1594 A.
The LED should light up.

If test lamp does not light up, renew oil pressure switch.
Start engine

Note:

The switching point of the oil pressure switch can be reached when the engine is cranked on the starter motor, so watch the tester and the test lamp while starting the engine.

Test lamp should go out at 0.15...0.45 bar.

If test lamp fails to go out, renew oil pressure switch.

Note:

Blue oil pressure switch (0.25 bar) is supplied to replace brown oil pressure switch (0.3 bar).

Testing oil pressure switch 0.9 bar (grey) or 1.8 bar (white)

Fitting location: at bottom of oil filter bracket.

Disconnect wire from oil pressure switch.

Unscrew oil pressure switch and screw in oil pressure tester V.A.G 1342.
Screw oil pressure switch -2- intoV.A.G 1342.
Connect brown wire -1- of tester to earth (-).
Connect voltage tester V.A.G 1527 B to oil pressure switch and positive side of battery (+) using test leads from V.A.G 1594 A.
Test lamp should not light up

If test lamp lights up, renew oil pressure switch.
Start engine

Grey oil pressure switch:

Test lamp should light up at 0.75...1.05 bar.

White oil pressure switch:

Test lamp should light up at 1.6...2.0 bar.

All models

If test lamp does not light up, renew oil pressure switch.

Testing oil pressure

Disconnect wire from oil pressure switch.

Unscrew oil pressure switch and screw in oil pressure tester V.A.G 1342.
Screw oil pressure switch -2- intoV.A.G 1342.
Start engine (engine oil temperature at least 80°C).
Oil pressure at 2000 rpm: at least 2.0 bar
Oil pressure at higher engine speeds: max. 7.0 bar

If the specifications are not obtained:

Pressure relief valve or oil pump defective; renew oil pump => Page 17-14.