Passat Wagon L4-2.0L (ABA) (1995)
Air Flow Meter/Sensor: Testing and Inspection
Mass Air Flow Sensor, Checking
MASS AIR FLOW SENSOR, CHECKING
Special tools, testers and auxiliary items
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VAG 1551 Scan Tool (ST) or vehicle system tester VAG 1552 with VAG 1551/3 adapter cable
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VAG 1598/18 test box
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Multimeter (Fluke 83 or equivalent)
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VW 1594 connector test kit
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Wiring diagram
Test conditions
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Electrical consumers switched off (radiator coolant fan must not run during the check)
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Air conditioner switched off
Test sequence
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Start engine and run at idle speed.
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Connect VAG 1551 scan tool (VAG 1552) and insert "Engine Electronics" address word 01. Carry out selection at idle, refer to "On-Board
Diagnostics II With VAG 1551". 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
Input display group number XXX
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Press -0-, -0- and -1- to input display group number 001.
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Press -Q- button to confirm input.
Indicated on display (1, 2, 3 and 4 = Display fields)
Read measuring value block 1
->
1
2
3
4
NOTE: If something different is indicated on the display:
See Scan tool operating instructions.
CAUTION! Do not continue with the check until engine coolant temperature exceeds 80 °C (display field 2).
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Press -C- button.
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Press -0-, -0- and -3- to input display group number 003.
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Press -Q- button to confirm input.
Indicated on display (1, 2, 3 and 4 = Display fields)
Read measuring value block 3
->
1
2
3
4
-
Check engine load signal in display field 2.
Specification: 0-5%
If the specification is not attained or the value remains constant when revving-up:
-
Continue check according to following table.