Audi Workshop Service and Repair Manuals

Checking oil pressure and oil pressure switch

Special tools and workshop equipment required

t	Oil pressure tester -V.A.G 1342- with adapter -V.A.G 1342/14-

t	Voltage tester -V.A.G 1527 B-

t	Measuring leads -V.A.G 1594 C-

Test requirements l  Oil level OK. l  Engine oil temperature approx. 90 °C (radiator fan must have run once)

Test sequence –  Lift off engine cover -arrows-.

–  Unbolt coolant expansion tank -arrow-. –  Unplug electrical wire for coolant shortage indicator switch -F66- at bottom of expansion tank and move expansion tank to one side with coolant hoses -1- and -2- attached.

–  Unplug electrical connector at oil pressure switch -F1--arrow-. –  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-. –  Connect brown wire -1- of oil pressure tester to earth (-). Checking oil pressure switch –  Connect voltage tester -V.A.G 1527 B--item 1- with adapter leads from auxiliary measuring set -V.A.G 1594 C- to oil pressure switch and battery positive (“+”). l  LED should not light up. If the LED lights up: –  Renew oil pressure switch. –  Start the engine.   Note Observe tester and LED while starting, as switching point of oil pressure switch may already be exceeded when starting. l  LED should light up at 1.2 ... 1.6 bar. If the LED does not light up: –  Renew oil pressure switch. Checking oil pressure –  Start engine (engine oil temperature approx. 80 °C). l  Minimum oil pressure at idling speed: 1.2 bar l  Minimum oil pressure at 2000 rpm: 3.5 bar The pressure relief valve or oil pump is defective if the specifications are not attained. Assembling Installation is carried out in the reverse order; note the following:   Note Renew seal when installing oil pressure switch. Tightening torque

Component	Nm
Oil pressure switch to oil filter housing	25