With wiring disconnected from the control unit and
connected to the system, check that the sensor
resistance between pins 13 - 15 is between 100
and 150 Ohm at an engine temperature of approx-
imately 20°
Disconnect the fuel pipe connector. Start up the
engine and wait for it to stop. With the wiring con-
nected to the control unit and system try to start up
the engine and check that the voltage between
pins 13 and 15 is around 2.8 V
With the interface cable harness disconnected
from the control unit, check continuity between pin
13 and the red cable of the engine speed sensor
connector and between pin 15 and the brown ca-
ble of the engine speed sensor connector
With the interface wiring and rpm sensor connec-
tor disconnected from the control unit, check that
the Red and Brown cables (pin 13 - 15) are isola-
ted from each other and insulated from the ground.
Specific tooling
020481Y Control unit interface wiring
020331Y Digital multimeter
Vespa LX 125 - 150 i.e. Injection
INJEC - 175
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