Volkswagen Passat 1995 Official Factory Repair Manual page 3257

Teves 20 GI ABS and ABS/EDL On Board Diagnostic (OBD)
Read measured value block
1 2 3
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2
4
Checking ABS first usable voltage signal
(display group 002)
ABS control module stores the first usable
voltage signal from ABS wheel speed sensor
when driving away and displays this as a set
value in "Read measuring value block"
In "Read measuring value block" there are always 4
display fields (-arrows- 1 to 4).
Values in display fields 1 and 2 must not be
above 6 km/h (approx. 4 mph)
Values in display fields 3 and 4 must not rise
above 2 km/h (approx. 1 mph)
If the values are above these, then a malfunction may
exist with ABS wheel speed sensor installation.
Possible malfunction causes:
Air gap between speed sensor and impulse rotor
too large (check speed sensor is correctly
attached to wheel bearing housing).
Exterior damage to ABS wheel speed sensor or
impulse rotor (replace damaged component).
Page 21 of 40
01-109
12/7/2004