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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 for reduced oil pressure -F378- (brown) using cables from auxiliary test set -V.A.G 1594C-. |
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| LED should not light up. |
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| If LED lights up, replace oil pressure switch for reduced oil pressure -F378-. |
If the LED does not light up: |
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| Start engine. At 0.55..0.85 bar the LED should light up, otherwise renew oil pressure switch. |
Checking oil pressure switch -F22- (blue): |
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| Connect voltage tester -V.A.G 1527B- to battery positive (+) and oil pressure switch -F22- (blue) using cables from auxiliary test set -V.A.G 1594C-. |
l
| LED should not light up. |
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| If the LED lights up, replace oil pressure switch -F22-. |
If the LED does not light up: |
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| Start engine and increase engine speed: At 2.15..02.95 bar the LED should light up, otherwise renew oil pressure switch. |
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