Volkswagen Workshop Service and Repair Manuals

Checking with engine leak detector spray G 001 800 A1

Special tools, testers and auxiliary items

• ◆ Fault reader V.A.G 1551 with cable V.A.G 1551/3
• ◆ 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.
• ◆ The safety precautions listed on the container must be adhered to.

Test sequence

• ‒ Start engine and run at idling speed.
• ‒ Connect fault reader V.A.G 1551 and select engine electronics control unit (address word 01); selection is carried out with engine idling .

• ‒ Input 08 for "Read measuring value block" function and confirm with Q.

• ‒ Input 01 for display group 01 and confirm with Q.

Note:

If something different is indicated on the display:

=> Fault reader operating instructions

• ‒ Read and note Lambda factor in display zone 3.
• ‒ Systematically spray parts of the intake system with engine leak detector spray.

If the engine speed drops or the Lambda factor changes in display zone 3:

• ‒ Check for leaks in the area of intake system sprayed and eliminate leak.