SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4-cylinder diesel engine (2.0 l 4V, TDI Common-Rail) | Fuel preparation system Diesel injection | Injectors

Checking for injectors sticking open

WARNING

t	Always observe rules for cleanliness and instructions when working on fuel system → Chapter.

t	Always follow these rules for cleanliness and instructions before starting work and while working on the fuel system.

Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter.

Special tools and workshop equipment required

t	Manual vacuum pump -VAS 6213-, see equivalency → Anchor

t	Use an injector return line to make an -adapter-.

Procedure

–	Erase fault memory entry with vehicle diagnosis tester.

–	Loosen the engine cover at the locations -arrows- and remove.

–	Clean all connections (e.g. with commercial cleaning solution) before removing.

Note

t	Make sure all parts are clean; no dirt must be allowed to enter the fuel system.

t	Check all cylinders in turn.

–	Dry all components after cleaning.

Start with cylinder 1.

–	Pull the connections of the return line off at injectors. To do this, press bows -1- and -2- down and pull the release pin upwards -arrow- at the same time.

–	Connect the adapter that had previously been cleaned using compressed air to the injector that should be tested.

–	Use hand-operated vacuum pump -VAS 6213- to generate vacuum of -500 mbar.

If the injector is functional, the pressure remains constant for over 30 seconds.

If the injectors are defective, pressure drops within 2 ... 3 seconds back to 0 bar.

Repeat check is necessary, observe pressure loss at hand-operated vacuum pump -VAS 6213-.

–	Replace the faulty injectors → Chapter.

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