TT Roadster L4-1.8L Turbo (AWP) (2003)
Fuel Injector: Testing and Inspection
With Generic Scan Tool
Checking Fuel Injectors For Injection Quantity And Proper Seal
Recommended special tools and equipment
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VAG1348/3A remote control with VAG1348/3-2 adapter cable
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V.A.G 1602 tester for quantity of injected fuel
Without illustration:
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VAG1594A connector test kit
Test requirement
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Fuel pressure must be OK, fuel pressure regulator and retaining pressure, checking. See: Fuel Pressure Regulator/Testing and Inspection
WARNING: Fuel system is under pressure. Before opening system, place rags around the connection point. Then release pressure by carefully
loosening connection.
Test sequence
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Disconnect fuel injector connectors.
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Remove mounting bolts from fuel distributor.
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Then remove the fuel distributor completely.
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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
NOTE: The only purpose of this step is to allow the Fuel Pump (FP) to run with the engine at standstill.