With Manufacturer's Scan Tool

Intake Air System (unmetered Air), Checking For Leaks

Checking with engine leak detector spray G 001 800 A1

Special tools and equipment 1
- V.A.G1551 scan tool or V.A.G1552 mobile scan tool with V.A.G1551/3B cable
- Engine leak detector spray G 001 800 A1

Test conditions
- Coolant temperature must be at least 80 degrees C, see display group 04, display zone 3.

Test sequence

NOTE:
- The vacuum in the intake system will cause the leak detector spray to be drawn in with the unmetered air. The leak detector spray reduces the ignitability of the mixture. This leads to a drop in engine speed and to a change of oxygen sensor reading.
- The safety precautions listed on the container must be adhered to.

- Connect V.A.G1551 scan tool (V.A.G1552). Start engine and select "Address word" 01 of engine control module. Engine must be running at idling speed. (Connecting scan tool and selecting engine control module.)

Indicated on display:

Rapid data transfer HELP
Select function XX

- Press keys 0 and 8 for function "Read measured value block" and confirm entry with Q key.

Indicated on display:

Read measured value block HELP
Input display group number XXX

- Press keys 0, 0 and 1 for "Display group number 1" and confirm entry with Q key.

Indicated on display:(1 to 4 = Display zones)

Read measured value block 1
1 2 3 4

- Observe engine speed in display zone 1 and oxygen sensor control in display zone 3.
- Systematically spray parts of intake system with engine leak detector spray.

If the engine speed drops or the oxygen sensor controller changes:
- Press -> key.
- Press keys 0 and 6 for "End data transfer" function and confirm input with Q key.
- Switch ignition off.
- Check sprayed areas of intake system for leaks and repair if necessary.