Beetle L4-2.0L (AEG) (2000)
Test sequence
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Disconnect harness connector from all fuel injectors.
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Remove fuel rail assembly.
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Disconnect vacuum hose from fuel pressure regulator.
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Lift fuel rail with injectors from intake manifold and support
Leak-checking
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Select Function 03: Output Diagnostic Test Mode and activate cyl. 1 fuel injector -N30. See: Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/Output Diagnostic Test Mode (DTM) (Function 03)
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Fuel pump must run.
NOTE: This check allows the fuel pump to operate without running the engine. The Closed Throttle Position switch must remain closed for this check,
otherwise the selected injector will inject 5 times.
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Visually check fuel injector for leaks.
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Only 1 to 2 drops per minute allowed from each injector when fuel pump is running.
If fuel loss is greater than specified:
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Switch OFF ignition and replace leaking fuel injector.
NOTE: Always replace seals.
Fuel injection quantity, checking
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Insert injector to be checked in a measuring glass for VAG 1602 Fuel analyzer.
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Connect one terminal of injector to be tested to engine Ground using jumper wires from VW 1594 Adaptor kit.
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Connect other injector terminal and jumper wire to VAG 1348/3A remote control using VAG 1348/3-2 adaptor cable
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Connect alligator clip to Battery +.
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Select Function 03: Output Diagnostic Test Mode and activate cyl. 1 fuel injector N30. See: Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/Output Diagnostic Test Mode (DTM) (Function 03)
- Fuel pump must run.
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Operate remote control VAG 1348/3A for 30 seconds.
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Repeat check for other injectors on this cylinder bank using separate measuring containers.
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After all injectors have been activated, place the measuring containers on a horizontal surface and compare the injected quantities.
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Specification: 85 to 105 ml per injector
If measured quantity of one or more injectors above or below specification
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Replace faulty fuel injector(s).
Install fuel injectors in reverse order of removal procedure. When installing, note the following:
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Replace O-rings on all injectors after first moistening the new O-ring with clean engine oil.
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Vertically insert injectors into the correct position in the fuel rail and secure with retaining clips.
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Fit fuel rail with secured injectors onto intake manifold and press in evenly.
With Generic Scan Tool
Injection Quantity And Proper Seal Of Fuel Injectors, Checking