Functional check

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Connect VAG 1551/1552 Scan Tool.

See appropriate On Board Diagnostic (OBD) article.

Start engine and let idle.
Press buttons -0- and -1- to select "Engine electronics" address word 01.

Display will appear as shown

Fig 1: Indicating On Display: Select Function XX

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Press buttons -0- and -4- to select "Basic setting" function 04.
Press -Q- button to enter input.

Display will appear as shown

Fig 2: Indicating On Display: Basic Setting

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Press buttons -1-, -5- and -0- to select "Display group 150".
Press -Q- button to enter input.

Indicated on display (1 to 4 = Display fields)

Fig 3: Indicating On Display: System In Basic Setting 150

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Run engine at idle speed (800 -880 RPM) and check specifications after 60 seconds.

DISPLAY GROUP 150: TANK VENTILATION SYSTEM

	Display fields
	1	2	3	4
Indicated	Opening % of canister purge regulator valve	Change % in oxygen sensor 2	Mass air flow sensor	On Board Diagnostic (OBD)
Specification	-	-7 to 7 %	Max 0.39 g/s	xxxxx100

If specifications not obtained:

Perform Output Diagnostic Test Mode and activate EVAP canister purge regulator valve -N80-.

See OUTPUT DIAGNOSTIC TEST MODE (DTM) (SCAN TOOL FUNCTION 03) .

Display Readiness Code.

See READINESS CODE, READING (SCAN TOOL FUNCTION 15) .

If specifications obtained:

Press --> button.

Display will appear as shown

Fig 4: Indicating On Display: Select Function XX

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Press buttons -0- and -6- to select "End transfer" function 06.
Press -Q- button to enter input.
Switch ignition off.