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| Remove the oil pressure switch -F1- of 1.4 bar -A- and screw onto the tester. |
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| Screw the tester into the oil filter bracket, in place of theoil pressure switch. -F1- |
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| Connect brown wire of tester to earth (-). |
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| Connect the voltage tester -VAG 1527B- with the auxiliary cables of the auxiliary measurement set -VAG 1594C- to the battery positive (+) and the oil pressure switch -F1--A-. The diode should not light. |
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| If the LED lights up, renew the 1.4 bar oil pressure switch -F1-. |
| If the LED does not light up: |
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| Make the engine run at high speed: The LED must light-up when an overpressure between 1.2 ... 1.6 bar a luminous diode should light up. If not, replace the oil pressure switch -F1- |
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| Oil pressure at engine idle: min. 2 bar. |
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| Increase engine speed further. At 2000 rpm and with the oil temperature at 80 °C, the oil pressure should be between 2.7 ... 4.5 bar. |
| If the specifications are not obtained |
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| Check the breather tube strainer → Item |
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| Correct mechanical damage (e.g. damage to bearings). |
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| If necessary, replace the air filter bracket with pressure relief valve → Item, or the oil pump with balance shaft assembly → Item. |
| At higher engine speeds, the oil pressure must not exceed 7.0 bar. |
| If specification is exceeded: |
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| If necessary, replace oil filter bracket with pressure relief valve → Item. |
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