Checking components
Checking intake air system for leaks (unmetered air)
Checking with engine leak detector spray G 001 800 A1
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
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◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3A
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◆ Engine leak detector spray G 001 800 A1
Test conditions
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● Coolant temperature must be at least 80 °C, =>display group 1, display zone 2.
Test sequence
Notes:
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◆ 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 voltage.
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◆ The safety precautions listed on the container must be adhered to.
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‒ 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
.)
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