VESPA GTS Super 125 i.e. Service Station Manual page 163

Vespa GTS Super 125 i.e.
Injection
With wiring disconnected from the control unit and connected to the system, check that the sensor
resistance between pins 20 - 29 is between 100 and 150 Ohm at an engine temperature of approxi-
mately 20°
Disconnect the fuel pipe connector. Start up the engine and wait for it to stop. With the wiring connected
to the control unit and system try to start-up the engine and check that the voltage between pins 20 and
29 is around 2.8 V
With the interface wiring disconnected from the control unit, check continuity between pin 29 and the
red cable of the engine speed sensor connector and between pin 20 and the brown cable of the engine
speed sensor connector
With the interface wiring disconnected from the control unit and engine speed sensor connector , check
that the Red and Brown cables (pin 29 - 20) are isolated from each other and insulated from the ground.
Specific tooling
020481Y Control unit interface wiring
020331Y Digital multimeter
INJEC - 163