Golf GTI L4-1984cc 20L DOHC (9A) (1990) Engine Lubrication Oil Pressure Sender Specifications
Oil Pressure Sender: Testing and Inspection
OIL PRESSURE AND OIL PRESSURE SWITCH, CHECKING
NOTE: To functionally check and service the optical and acoustical oil pressure display system.
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Remove the 1.8 bar oil pressure switch (white) and thread it into tester VAG 1342
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Thread the tester into the oil filter flange in place of the removed switch
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Connect the brown wire of the tester to ground
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Connect LED tester VAG 1527 between battery positive and -A- the 0.3 bar oil pressure switch (F 22) using jumper wires from the VW 1594
adaptor kit
^ the LED tester must light up
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Start the engine and slowly increase engine speed
^ between 0.15. to 0.45 bar the LED tester must switch off, if not, then replace the 0.3 bar pressure switch
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Connect LED tester to -B- 1.8 bar oil pressure switch (F 1)
^ between 1.6 to 2.0 bar the LED tester must light up. If not, then replace the 1.8 bar oil pressure switch
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Increase engine rpm
^ at an engine speed of 2000 rpm and an oil temperature of 80°C (176°F) the oil pressure must be 2.0 bar minimum