A4 Quattro Wagon V6-2.8L (AHA) (1998)
Canister Purge Control Valve: Testing and Inspection
Evaporative Emissions (EVAP) Canister Purge Regulator Valve, Checking
WARNING!
Whenever carrying out work on the fuel supply and/or fuel injection systems, read and carefully follow the Cautions, Warnings, and rules of
cleanliness.
Required special tools and test equipment
-
VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3 adapter cable
Test conditions
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Engine coolant temperature at least 80 °C (176 °F)
Function check
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Connect VAG1551 or VAG1552 scan tool and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at
idle). Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1551/1552 Scan Tool" See: Computers and Control
Systems/Testing and Inspection
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
HELP
Input display group number XXX
-
Press buttons -0-, -7- and -0- to input display group number 70 (070), and press -Q- button to confirm input.
Indicated on display (1-4 display fields)
Read Measuring value Block 70
->
1 2 3 4
-
Press button -4- to select "Basic Setting" function 04 (diagnosis for EVAP canister purge regulator valve is initiated).
NOTE: During this diagnosis there should not be any load placed on the engine, otherwise the diagnosis is interrupted and must be started again.
Indicated on display (1-4 = display fields)
System in Basic Setting 70
->
1 2 3 4
If the diagnosis is initiated by the ECM, the display changes from "Test OFF" to "Test ON" in display field 4.
-
Continue to run engine at idle until "EVAP OK" is indicated in display field 4.
NOTE: If the display changes from "Test ON" to "Test OFF" during the test, accelerate with a brief burst to repeat the test.