90 L5-2309cc 2.3L SOHC (NG) (1988)
Static Test/Adjusting
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disconnect potentiometer harness connector and connect VW 1501 test adaptor between potentiometer and harness connector
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switch multimeter US 1119 to 20 volt range and connect to terminals 1 and 3 (U1 voltage) of VW 1501 adaptor
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switch ON ignition
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must be 4.35 to 5.35 volts
Note
U1 : voltage supplied from fuel injection ECU
U2 : sensorplate potentiometer output voltage
If NO
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check power supply fuse of fuel inj. ECU
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check wiring between fuel injection control unit and potentiometer using wiring diagram, repair as necessary If wiring OK
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replace fuel injection ECU
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switch multimeter US 1119 to 2 volt range and connect to terminals 2 and 3 (U2 voltage) of VW 1501 adaptor
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switch ON ignition (but do not start engine)
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U2 must fall within the center third of the shaded area of the graph
If NO
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remove sealing compound covering head of potentiometer trim screw
Caution
Do not damage the trim screw when scraping away the sealing compound