24-81
Mass Air Flow (MAF) sensor,
checking
Notes:
To functionally check the Mass Air Flow (MAF)
sensor Repair Group 01, Basic setting,
display group 001, display field 2.
Component locations page 24
-1 .
Checking voltage supply
Mass Air Flow (MAF) sensor fuse OK
- Disconnect MAF sensor harness connector.
- 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.
- Switch ignition ON.
Specified value: approx. 12 to 14 volts
Pa
ge 1 of 5 Mass Air Flow
(MAF
) sensor, checkin
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.23
24-84
Checking function
- Slide back protective boot from back of MAF
sensor connector (leaving it connected).
Note:
The connector pin numbers are marked on the
back of the connector itself.
- Switch multimeter (Fluke 83 or equivalent) to
measure voltage and connect between terminal
2 (GND) and terminal 1 (B+) using jumper wires
from connector test kit VW 1594.
- Switch ignition ON.
Specified value: 0.3 to 1.1 volts
- Start engine and let idle.
- Switch off all electrical consumers (engine
coolant fan should not run during measurement).
Continuously vary engine speed between idle
and 4000 RPM.
Specified value: 1.5 volts minimum to 3.4 volts
Pa
ge 4 of 5 Mass Air Flow
(MAF
) sensor, checkin
g
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.23
