Jetta Sedan V6-2.8L (BDF) (2003)
Test requirement
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Fuel pressure must be OK, fuel pressure regulator and retaining pressure, checking.
See: Fuel Pressure/Testing and Inspection
Test sequence
WARNING: Fuel system is under pressure! Before opening system, place rags around the connection point. Then release pressure by carefully
loosening connection.
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Then, remove the fuel distributor completely (fuel lines remain connected)
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Vehicles with engine code AFP, intake manifold lower part, disassembling and assembling,
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Vehicles with engine code BDF, fuel distributor, disassembling and assembling.
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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.
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Bridge sockets 2 + 65 of test box with the respective adapter cables. Fuel Pump (FP) must run.
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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.
If fuel loss is greater:
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Replace faulty fuel injector:
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Vehicles with engine code AFP.
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Vehicles with engine code BDF.
Note the following when installing the fuel injectors:
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Replace O-rings on all fuel injectors and wet them slightly with clean motor oil.
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Insert fuel injectors into fuel rail perpendicular and in the right position, and secure them with retaining clips.
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Position fuel distributor with secured fuel injectors and apply uniform pressure to press it in.
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The connectors must audibly engage on valves when attached.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 4:
Reset/Erase Diagnostic Data
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Generate readiness code.
See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Checking Injection Quantity
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Insert a fuel injector to be tested into a measuring glass of VAG1602 tester for fuel injection quantity.
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Using respective adapter cables, connect one terminal of fuel injector to be checked to engine Ground (GND).
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Use adapter cable to connect second terminal of fuel injector to VAG1348/3 remote control with VAG1348/3-2 adapter cable.
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Connect alligator clip to B+.
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Switch ignition on.
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Bridge sockets 62 + 65 of test box with the respective adapter cables. Fuel Pump (FP) must run.
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Operate VAG1348/3 remote control for 30 seconds.
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Repeat test on other fuel injectors. Use new graduated measuring glasses for this.