A8 Quattro Sedan V8-4.2L (AUX) (2001)
Air Flow Meter/Sensor: Testing and Inspection
Mass Air Flow (MAF) Sensor -G70, Checking
Requirements
-
Coolant temperature at least 80 °C (175 °F)
-
Electrical consumers switched off (radiator fan must not run during test)
-
A/C switched off
-
Fuse for mass air flow sensor OK
Checking function
-
Connect vehicle diagnostic, testing and information system VAS5051 or VAG1551 scan tool and select engine electronics control module by
entering address word "01". When doing this the engine must be at idle. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial
Checks/Connecting VAS5051 or VAG1551" See: Computers and Control Systems/Testing and Inspection
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -4- to select function "Basic Setting" and confirm entry with -Q- button.
NOTE: During the basic setting the engine control module closes the EVAP canister purge regulator valve -N80 and switches off the A/C compressor.
Indicated on display
System in Basic Setting
Q
Input display group number XXX
-
Press buttons -0-, -0- and -2- to select Display Group 002 and confirm entry with -Q- button.
Indicated on display
System in basic setting 2
->
1
2
3
4
-
Check displayed specified values for engine load.
If the specification is obtained:
-
Press -> button.
-
Press buttons -0- and -6- to select function "End Output" and confirm entry with -Q- button.
-
Switch ignition off.