VESPA GTS Super 125 i.e. Service Station Manual page 112

Electrical system
Circuit open or shorted to negative: interruption of the circuit or null voltage at PIN 1 of the control unit
connector.
Troubleshooting
Short circuit to positive:
- Disconnect the coil connector, turn the key to ON and activate the component through the diagnostics
instrument.
- Verify the presence of voltage on the coil connector PIN 2: if present, restore the cabling, otherwise
replace the coil.
Open circuit:
- Carry out the check procedure of the coil and control unit connectors.
- Verify continuity of the cabling between the coil and control unit: Coil PIN 2 - control unit PIN 1. If there
is no continuity, restore the cable harness.
- Verify, with the key turned ON, the presence of voltage on the coil connector PIN 1. If no voltage is
detected, check that the cable harness between the coil and injection relay is not interrupted: Coil PIN
1 - relay PIN 87.
- If the above tests provided a positive result, the coil should be replaced.
Short circuit to negative:
- Disconnect the control unit connector and the coil connector.
- Verify the coil connector PIN 2 ground insulation (or control unit connector PIN 1). If necessary, restore
the cable harness.
ELECTRIC FAN CIRCUIT
Function
Radiator fan and coolant - Operation.
Operation / Operating principle
The control unit closes the fan control relay excitation circuit to ground until the temperature drops.
ELECTRICAL ERRORS
Fan relay P0480 - shorted to positive / shorted to negative / open circuit.
Error cause
Shorted to positive: excessive voltage at PIN 24 of the control unit connector.
Shorted to negative: null voltage at PIN 24 of the control unit connector.
Open circuit: circuit interruption.
Troubleshooting
Short circuit to positive:
- Disconnect the fan control relay and, turning the key to ON position, measure the voltage read at PIN
85 of the relay connector to the cable harness: if the voltage is 12V restore the cabling. If the voltage
is zero replace the relay.
Short circuit to negative:
ELE SYS - 112
Vespa GTS Super 125 i.e.