Fuel Delivery and Air Induction: Testing and Inspection

INTAKE AIR SYSTEM, CHECKING FOR LEAKS (OUTSIDE AIR)

Checking with engine leak detector spray G 001 800 A1

Special tools, testers and auxiliary items
- VAG 1551/1552 scan tool with VAG 1551/3 adapter cable
- Engine leak detector spray G 001 800 A1

NOTES:
- The vacuum in the intake system will cause the leak detector spray to be drawn in with the outside air. The leak detector spray reduces the ignitability of the mixture. This leads to a drop in engine speed and to a significant increase of the CO content.
- Observe the safety precautions listed on the container.

Test sequence
- Engine running at idle

- Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01. Refer to "On-Board Diagnostics II With VAG 1551". Testing and Inspection

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.

Indicated on display

Read Measuring Value Block HELP
Input display group number XXX

- Press buttons -0-, -0- and -1- for display group 001 and press -Q- button to confirm input.

Indicated on display (1-4 = Display fields)

Read Measuring Value Block 1 ->
1 2 3 4

- Note Oxygen Sensor (O2S) control in display field 3.





- Systematically spray parts of the intake system with engine leak detector spray.

If the engine speed drops or the value displayed for O2S control changes:
- Check the area of the intake system which has been sprayed for leaks and eliminate leaks.