5000S Quattro Sedan L5-2309cc 2.3L SOHC (NF) (1988)
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clamp one of the two hoses with pliers until an engine speed of 800 ± 20 RPM along with an ignition angle of 13 - 17° before Top Dead Center is
displayed on VW 1367
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read output voltage U2 of potentiometer and record then compare to U1 voltage on diagram (which was recorded earlier)
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U1 = supply voltage of potentiometer between terminals 1 and 3
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U2 = output voltage of potentiometer between terminals 2 and 3 (measured with engine idle 800 ± 20 RPM)
If the U2 voltage measures slightly below the lower tolerance range on the graph
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check intake air boot, crankcase ventilation hoses, carbon canister hoses, and vacuum lines for leaks
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after eliminating leaks, repeat test If NO leaks are found
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adjust potentiometer
