TT Roadster L4-1.8L Turbo (AWP) (2003)
Fuel Injector: Testing and Inspection
With Manufacturer's Scan Tool
Fuel Injector Leakage, Injection Quantity And Spray Pattern, Checking
Special tools and equipment
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VAG 1348/3A
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VAG 1594 A
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VAG 1598/31
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VAG 1602
Test requirement:
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Fuel pressure OK. See: Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Fuel Pressure, Pressure
Regulator and Holding Pressure, Checking
Test sequence
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Remove fuel rail (together with injectors) from intake manifold. Do not disconnect the fuel hoses.
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Connect test box VAG 1598/31 to wiring harness for engine control module. Do not connect to the engine control module itself. See: Computers
and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Manufacturer's Scan Tool/Scan Tool
Connecting and Initial Checks/Wiring and Component Testing Using VAG1598/31 Test Box
Testing for leaks
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Bridge contacts 1 and 65 on the test box using test leads from adapter set VAG 1594 A.
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Switch on ignition.
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The fuel pump should run.
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Check injectors for leaks (visual check). When the fuel pump is running, only 1 or 2 drops should escape per minute from each injector.
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If a greater amount of fuel escapes, switch off the fuel pump (switch off ignition) and replace the faulty injector.
Checking injection quantity