5000S Quattro Sedan L5-2309cc 2.3L SOHC (NF) (1988)
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switch ignition ON
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specification: approximately 4.5 - 5 volts
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connect multimeter US 1119 between terminals 1 and 2
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specification: approximately 4.5 - 5 volts
If specification is obtained
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replace differential pressure regulator
If specification is NOT obtained
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remove fuel injection control unit access cover in right passenger foot well and disconnect harness connector from control unit
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with multimeter US 1119, check continuity between fuel injection control unit harness connector and differential pressure regulator harness
connector:
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35 pin connector terminal 4 and 2 pin connector terminal 1
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35 pin connector terminal 5 and 2 pin connector terminal 2
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specification: approximately 0.2 ohm
If specification is NOT obtained
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repair break in wiring using wiring diagram
If specification IS obtained
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replace fuel injection control unit