5000S Quattro Sedan L5-2309cc 2.3L SOHC (NF) (1988)
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connect test adapter VW 1501 between potentiometer and potentiometer harness connector (arrow)
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switch multimeter to 2 volts DC range and connect between terminals 2 and 3 of test adapter
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switch ignition ON
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install tool VW 1348/1
NOTE: Before installing tool, pull slide 2 out to upper stop. Place tool centrally on edge of the air flow sensor. Edge 3 must point in the direction
of the fuel distributor.
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push slide 2 down to stop
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rotate screw 1 until base of magnet contacts the sensor plate mounting screw (with sensor plate in rest position)
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turn VW 1348/1 adjuster screw 1 until voltage displayed on multimeter is same as voltage U2
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connect multimeter to terminals 1 and 3 of test adapter
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adjust potentiometer trim screw until voltage displayed on multimeter falls within tolerance shown on graph
If an acceptable value CANNOT be obtained by adjusting the potentiometer trim screw
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remove fuel distributor from air flow sensor assembly
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replace air flow sensor assembly including potentiometer
NOTE: NO potentiometer adjustment is necessary if the air flow sensor assembly is replaced.
If acceptable values ARE obtained according to graph
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reinstall mixture control assembly and recheck the potentiometer
If OK
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apply sealing paint to potentiometer trim screw
For vehicles with California control unit ONLY