audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Fuel Accumulator > < Differential Pressure Regulator|Locations|Page 2538
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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

Fuel Accumulator > < Differential Pressure Regulator|Locations|Page 2538