Passat Sedan V6-2771cc 2.8L DOHC (AHA) (1998)
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Pull connectors -1- off connection -2- of all fuel injectors.
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Unscrew fuel rail from intake manifold (arrows).
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Disconnect vacuum hose from fuel pressure regulator.
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Lift fuel rail with fuel injectors off intake manifold and support it.
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Connect test box to control module wiring harness, connect test box for wiring test. See: Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring
Test
Checking Proper Seal
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Switch ignition on.
Vehicles with engine code AHA
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Bridge sockets 1 + 4 of test box with the respective adapter cables.
Fuel Pump (FP) must run.
Vehicles with engine code ATQ
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Bridge sockets 62 + 65 of test box with the respective adapter cables.
Fuel Pump (FP) must run.
Continuation for all vehicles
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Check proper seal of fuel injectors (visual inspection). With Fuel Pump (FP) running, only 1 to 2 drops per minute should escape from each valve.
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Disconnect connection between test box sockets.
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Switch ignition off.
