5000S Wagon L5-2309cc 2.3L SOHC (NF) (1988)
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switch ignition OFF
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remove fuel injection control unit access cover in right passenger side footwell
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remove harness connector from fuel injection control Unit
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check resistance between potentiometer harness connector and control unit harness connector as follows:
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Potentiometer connector terminal 1 and control unit connector terminal 26
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Potentiometer connector terminal 2 and control unit connector terminal 23
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Specification 0 - 0.8 Ohms
If NO
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check for break in wiring using wiring diagram
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connect test adapter VW 1501 between potentiometer and potentiometer harness connector
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switch multimeter US 1119 to 2 volts DC range and connect to terminals 2 and 3 of test adapter
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VW 1501
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switch ignition ON (with air flow sensor plate in rest position)
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Specification 0-200 mV
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connect engine tester VW 1367
CAUTION: Make sure that the VW 1367 Top Dead Center pickup is fully inserted into the transmission housing.
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insert spare fuse into top of fuel pump relay (do NOT remove until test is complete)
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start engine and run at idle
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remove harness connector from idle stabilizer valve
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engine speed MUST increase