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| Remove oil pressure switch -F1- and screw into tester. |
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| Screw tester into oil filter bracket in place of oil pressure switch. |
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| Connect brown wire of tester to earth (-). |
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| Connect voltage tester -V.A.G 1527B- to battery positive (+) and oil pressure switch using cables from auxiliary test set -V.A.G 1594A- or auxiliary test set -V.A.G 1594C-. LED must not light up. |
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| If the LED lights up, renew 1.4 bar oil pressure switch -F1-. |
If LED does not light up: |
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| Start engine and run at idling speed: At 1.2...1.6 bar the LED must light up, otherwise replace oil pressure switch. |
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| Check oil pressure at different speeds: Idling: minimum 2.0 bar, 2,000 rpm: 3.0...4.5 bar. above 2,000 rpm: maximal 7.0 bar. |
If the specifications are not obtained: |
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| Rectify mechanical damage, e.g. damaged bearings. |
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| 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: |
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| Check the oil passages. |
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| If necessary, replace oil filter bracket with pressure relief valve → Item. |
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