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| Remove the oil pressure switch -F1- and thread it on to the tester. |
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| Thread the tester on to the cylinder head, in the place for the oil pressure switch. |
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| Connect the brown wire of the tester to earth (-). |
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| Connect diode lamp -V.A.G 1527B- with auxiliary leads -V.A.G 1594A- or -V.A.G 1594C- to battery positive (+) and to the oil pressure switch. |
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| If the diode lamp lights up, replace the oil pressure switch -F1-. |
| If the diode lamp does not light up: |
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| Start the engine and slowly raise revs. Between 0.3..0.6 bar of overpressure the diode lamp should light up; otherwise replace the oil pressure switch. |
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| Continue raising revs. At 2000 rpm and with oil temperature at 80 oC, oil pressure should be 2.0 bar, minimum. |
| At higher revs, oil pressure should not exceed 7.0 bar. If necessary, replace the oil pump cover with the relief valve. |
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