engine coolant AUDI A4 1997 B5 / 1.G AFC Engine Mass Air Flow Sensors Checking Workshop Manual
Page 4 of 5
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
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