S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
Mass Air Flow Sensor: Testing and Inspection
Mass Air Flow (MAF) Sensor -G70-, Checking
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/"
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.
Read measuring value block display group 2 as described and evaluate it. If the suggested repair steps refer to the voltage supply test for the Mass Air
Flow (MAF) sensor or the wiring connections from the Mass Air Flow (MAF) sensor to the Engine Control Module (ECM), proceed to the following
pages.
Please note the distinction between sensors made by Bosch and those made by Hitachi (recognizable via the writing on the sensor).
Checking voltage supply to Mass Air Flow (MAF) sensor
-
Disconnect harness connector from air mass meter.