Volkswagen Workshop Service and Repair Manuals

Checking with engine leak detector spray G 001 800 A1

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 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 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 Lambda probe reading.
• ◆ The safety precautions listed on the container must be adhered to.

Test sequence

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of engine control unit. When doing this the engine must be running at idling speed.
  (Connecting fault reader and selecting engine control unit .)

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

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

• ‒ Observe the engine speed in display zone 1 and the Lambda probe voltage in display zone 3.
• ‒ Systematically spray parts of the intake system with engine leak detector spray.

If the engine speed drops or the Lambda probe voltage briefly remains constant:

• ‒ Press the ⇒key.
• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
• ‒ Switch off ignition.
• ‒ Check sprayed areas of intake system for leaks and rectify if necessary.