Passat GLS Wagon L4-1.8L Turbo (AUG) (2001)
Air Flow Meter/Sensor: Testing and Inspection
Mass Air Flow (MAF) sensor, checking
Special tools and equipment
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V.A.G 1551 scan tool (or VAG 1552 mobile scan tool) with VAG 1551/3B cable
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VAG 1598/31 adapter cable
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VAG 1526 multimeter or VAG 1715 multimeter
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VAG 1594 connector test kit
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Wiring diagram
Test requirements
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Fuse no. 34 must be OK.
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Coolant temperature must be at least 80 °C, See display group 04, display field 3
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All electrical consumers like, for example, lights and rear window heating must be switched off.
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If vehicle is equipped with an A/C system, it must be switched off.
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For vehicles with automatic transmission, selector lever must be in -P- or -N-.
Test sequence
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Connect V.A.G 1551 scan tool (VAG 1552). Start engine and select the Engine Control Module (ECM) using address word 01. (connecting scan
tool and selecting ECM). Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1551 Scan Tool", See:
Computers and Control Systems/Testing and Inspection
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. Press -Q- button to confirm input.
Indicated on display:
Read measuring value block
HELP
Enter display group number XXX
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Press buttons -0-, -0- and -2- to select "Display group number 2". Press -Q- button to confirm input.
Indicated on display: (1 to 4 - display fields)
Read measuring value block 2
->
1
2
3
4
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Check mass flow of air into engine in display field 4. Specification: 2.0 to 4.5 g/s
If specified value is obtained, but DTC memory has a DTC concerning Mass Air Flow (MAF) sensor:
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Check voltage supply of Mass Air Flow (MAF) sensor.