A4 Quattro Sedan V6-2.8L (ACK) (1997)
Mass Air Flow Sensor: Testing and Inspection
Required special tools and test equipment
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VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
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VAG 1598/22 test box
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Multimeter US1119 (Fluke 83 or equivalent)
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VW1594 connector test kit
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Wiring diagram
Test requirements
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All electrical consumers switched off (coolant fan must not run during test).
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A/C must be switched off
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Fuse for MAF sensor OK
Test sequence
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Connect VAG 1551 or VAG 1552 scan tool and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at
idle) Refer to "VAG 1551/VAG 1552 Connecting and Selecting Functions".
Indicated on display
Rapid data transfer
HELP
Select function XX
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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
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Press buttons -0-, -0- and -2- to input display group number 2 (002), and press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Read Measuring Value Block 2
->
1
2
3
4
-
Compare display with specified values for engine load (display fields 2 and 4):
Display Group 2
If displayed values are OK (as specified):
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Press -> button.
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Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
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Switch ignition off.
Evaluation of display group 2