SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | Monomotronic injection and ignition system | Mixture preparation system, electronic inj.,Gas | Components and functions: verification | Inlet system (unmetered air) air tight seal: verification

Inlet system (unmetered air) air tight seal: verification

Special tools and workshop equipment required

t	Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3B-

t	Leak detector spray -G 001 800 A1-

Note

t	Due to the low pressure inside the inlet system, the leak detector spray will be sucked in with the unmetered air. The leak detector spray reduces the flammability of the mixture. This leads to a drop in engine speed and to a change of Lambda probe reading.

t	Follow strictly the security instructions printed on the container.

Checking process

–	Connect the equipment -V.A.G 1551- (-V.A.G 1552-). Start engine and select “Address code” 01 to select engine control unit. (Fault reader: Connecting and selecting the engine control unit → Chapter.)

Display indication:

–	Press the keys 0 and 8 for the function “Read measurement block values”, confirm using the key Q.

Rapid data transmission             HELP

Select the function XX

Display indication:

–	Press keys 0 and 0 for “Display group number 0” and confirm entry with Q key.

Read measurement block values       HELP

Input the indication group number XX

Display indication:

(1…10 = Display fields)

–	Note the value indicated in the field 5 (lambda probe) and memorise the range of oscillation.

–	Systematically apply the leak detector spray to the inlet system components.

If the engine speed drops and the indicated value falls outside of the margin:

–	Check sprayed areas of intake system for leaks and rectify if necessary.

Read measured value block              0

1    2    3   4   5   6   7   8   9   10

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