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| Remove oil pressure switch -F1- and screw it on test equipment. |
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| Screw test equipment on oil filter support instead of oil pressure switch. |
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| Connect brown wire from test equipment to ground (-). |
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| Connect Voltmeter -V.A.G 1527/B- with Measuring appliance set -V.A.G 1594/C- to the battery positive (+) and oil pressure switch. Light-emitting diode must not turn on. |
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| Start engine and increase rotation |
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