SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4-cylinder injection engine (5-valve), mechanics | Engine lubrication | Removing and installing parts of lubrication system | Checking oil pressure and oil pressure switch | Checking oil pressure and oil pressure switch: engine code AJH

Checking oil pressure and oil pressure switch: engine code AJH

Special tools and workshop equipment required

t	Oil pressure tester -V.A.G 1342-

t	Voltage tester -V.A.G 1527B-

t	Auxiliary measuring set -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594C-

Test prerequisites

l	Engine oil level OK, checking → Fig..

l	Engine oil temperature at least 80 °C (radiator fan must have run once).

Note

Functional check and repair of the visual and acoustic oil pressure warning: → Current flow diagrams, Electrical fault finding and Fitting locations.

Checking oil pressure switch

–	Remove 1.4 bar oil pressure switch -F1--A- and screw into tester.

–	Screw oil pressure tester -V.A.G 1342- into oil filter bracket in place of oil pressure switch -F1-.

–	Connect brown wire of tester to earth (-).

–	Connect voltage tester -V.A.G 1527B- to battery positive (+) and 0.25 bar oil pressure switch -F22- using cables from auxiliary measuring set -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594C--B-. The LED must light up.

–	Start engine and increase revolutions slowly. At 0.15...0.35 bar, the LED must extinguish; otherwise renew 0.25 bar oil pressure switch -F22- → Item.

–	Connect voltage tester -V.A.G 1527B- to 1.4 bar oil pressure switch -F1--A-. At 1.2...1.6 bar the LED must light up; otherwise renew oil pressure switch → Item.

Checking oil pressure

–	Check oil pressure at different revolutions: 2000 rpm: at least 2.0 bar, above 2000 rpm: max. 7.0 bar.

If the specifications are not attained:

–	Rectify mechanical damage, e.g. bearing damage.

–	Renew oil filter with pressure relief valve → Item or renew oil pump → Item.

At higher engine speeds, the oil pressure must not exceed 7.0 bar.

If the specification is exceeded:

–	Check the oil passages.

–	If necessary, renew oil filter bracket with pressure relief valve → Item.

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