Passat Sedan V6-2771cc 2.8L DOHC (AHA) (1998)
Mass Air Flow Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Mass Air Flow (MAF) sensor, checking
Special tools and equipment
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VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3 adapter cable
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VAG1598/22 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
Checking requirements
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Fuses No.31 and 32 OK
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All electrical consumers switched off (coolant fan must not run during test)
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A/C switched off
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Automatic transmission selector lever in "P" or "N" position
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Engine coolant temperature at least 85 °C (185 °F) See VAG1551 scan tool function 08, display group 004, display field 3
Checking
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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 VAG1551/VAG1552 Scan Tool" under "Engine", See:
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
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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
-
Check display with specified values for engine load (display fields 2 and 4).