Jetta GLS Wagon L4-2.0L (AZG) (2002)
Air Flow Meter/Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Mass Air Flow (MAF) Sensor -G70-, Checking
Special tools and equipment
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V.A.G1551 scan tool (or VAG1552 mobile scan tool) with VAGI551/3 cable
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VAG1598/31 test box
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Multimeter Fluke 83 or equivalent
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VAG1594 connector test kit
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Wiring diagram
Test requirements
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All fuses 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-.
Test sequence
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Connect V.A.G 1551 scan tool (VAG1552). Start engine and select the Engine Control Module (ECM) using address word 01. See: Computers
and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures
Indicated on display:
Rapid data transfer
HELP
select function XX
-
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
Enter display group number XXX
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Press 0, 0 and 2 for the function "display group number 2", and then press Q to exit from input mode.
Indicated on display: (1 to 4 = display fields)
Read measuring value block 2
->
1
2
3
4
-
Check mass flow of air into engine in display field 4
Specification: 2.0 to 5.0 g/s
If specified value is obtained, but DTC memory has a DTC concerning Mass Air Flow (MAF) sensor: