Volkswagen Workshop Service and Repair Manuals > Golf Mk6 > Power unit | 4-cylinder diesel engine (2.0 l engine, common rail, generation II) | Fuel preparation system Diesel injection | Injectors/high-pressure accumulator (rail)

Testing jammed-open injectors

WARNING

t	Read rules for cleanliness and the instructions for working on the fuel system → Chapter.

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

Special tools and workshop equipment required

t	Hand vacuum pump -VAS 6213-

t	Make an -adapter- from a return line.

–	Erase fault memory entry with vehicle diagnosis tester.

–	Remove engine cover panel → Chapter.

–	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 one cylinder after the other.

–	Dry all cleaned parts.

Begin with cylinder 1.

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

–	Connect clean adapter to injector to be tested.

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

If injector is OK, pressure remains constant for 30 s.

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

Repeat test, if necessary. Note loss of pressure of hand vacuum pump -VAS 6213-.

–	Renew defective injectors → Chapter

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