A4 Sedan V6-2.8L (AFC) (1996)
Air Flow Meter/Sensor: Testing and Inspection
NOTE:
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To functionally check the Mass Air Flow (MAF) sensor
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Component locations, refer to "Component Overview - II", See: Locations
Checking voltage supply
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Mass Air Flow (MAF) sensor fuse OK
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Disconnect MAF sensor harness connector.
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Switch multimeter (Fluke 83 or equivalent) to measure voltage and connect between connector terminals 2 (GND) and 3 (B+) using jumper wires
from connector test kit VW 1594.
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Switch ignition ON.
Specified value: approx. 12 to 14 volts
If the specified value is not obtained, perform the following tests:
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Check Mass Air Flow (MAF) sensor fuse.
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Check wiring for continuity between terminal 3 and fuse using wiring diagram.
Specified value: max. 0.5 ohms (ohms)
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Check wiring for continuity between terminal 2 and intake manifold Ground (GND).
Specified value: max. 0.5 ohms
Checking signal wire
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Connect VAG 1598/19 test box to ECM harness connector.
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Check signal wire for continuity between MAF sensor connector terminal 1 and test box socket A12.
Specified value: max.1.0 ohms
If the specified value is not obtained: