PIAGGIO 633929(IT) Service Station Manual page 212

Suspensions
With interface wiring disconnected from the park-
ing electrical control unit and connected to the
system, check that the sensor resistance between
pins 23 - 17 and 24 - 17 is between 774 and 946
Ohm at a temperature of approximately 20°
With interface wiring disconnected from the control
unit, check the continuity between pin 23 and the
brown cable of the LEFT wheel revolution sensor
connector; between pin 17 and the red cables of
the LEFT wheel revolution sensor and brown cable
of the RIGHT sensor; between pin 24 and the red
cable of the RIGHT wheel revolution sensor
In case of failures, check the continuity between
pin 23 and the connector green cable on the fuel
tank after removing the chassis central cover; be-
tween pin 17 and the yellow cables on both con-
nectors; between pin 24 and the red cable on the
connector.
With interface wiring disconnected from the control unit and the connectors disconnected from wheel
turning sensors, check that pin 23 - 17 and 24 - 17 are insulated from each other and from earth.
SUSP - 40
MP3 125