Jetta GLS L4-1.8L Turbo (AWD) (2001)
Checking for leaks
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Initiate Output Diagnostic Test Mode; the fuel pump must run. Refer to "Scan Tool Testing/Output Diagnostic Test Mode (DTM) Initiating" See:
Computers and Control Systems/Testing and Inspection
NOTE:
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This step serves only to run the fuel pump when the engine is stopped.
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During the Output Diagnostic Test Mode, the injectors are activated. Before initiate the Output Diagnostic Test Mode, you must disconnect the
injector connectors.
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Check injector for leaks (visual check). Only 1 to 2 drops per minute must emit from each valve when fuel pump is running.
If the fuel loss is greater:
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Switch off ignition and replace leaking injector.
NOTE: Always replace seals.
Checking injected quantity
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Insert injector to be checked in a measuring glass of tester for injected quantity VAG 1602.
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Connect one contact of the injector to be tested to engine Ground using auxiliary cables from VAG 1594.
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Connect the second injector contact with auxiliary cable to remote control VAG 1348/3 using adapter cable VAG 1348/3-2.
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Connect crocodile clip to battery ( + ).
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Initiate Output Diagnostic Test Mode; the fuel pump must run. Refer to "Scan Tool Testing/Output Diagnostic Test Mode (DTM) Initiating" See:
Computers and Control Systems/Testing and Inspection
NOTE:
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This step serves only to run the fuel pump when the engine is stopped.
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During the Output Diagnostic Test Mode, the injectors are activated. Before initiate the Output Diagnostic Test Mode, you must disconnect the
injector connectors.
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Operate remote control VAG 1348/3 for 30 seconds.
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Repeat check on the other injectors. To do this use new measuring beakers.
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After all injectors have been activated, place the measuring glasses on a horizontal surface and compare the injected quantity.
Specification: 133 - 157 ml per injector
NOTE: If the measured values of one or more injectors are above or below the prescribed specifications:
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Replace defective injector.
Perform installation of injectors in reverse order. When doing this note the following:
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Replace O-rings on all injectors and lightly moisten with clean engine oil.
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Insert injectors vertically and in the correct position into 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.