volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Fuel Injectors For Injection Quantity and Proper Seal, Checking|Page 5125 > < Fuel Injectors For Injection Quantity and Proper Seal, Checking|Page 5123
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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, checking.

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.

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Switch ignition on.

Checking Proper Seal

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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.

Fuel Injectors For Injection Quantity and Proper Seal, Checking|Page 5125 > < Fuel Injectors For Injection Quantity and Proper Seal, Checking|Page 5123