VESPA GTS Super 300 ie 2008 Service Station Manual page 111

Vespa GTS Super 300 ie (2008)
Electrical system
Open circuit: circuit interruption.
Troubleshooting
Short circuit to positive:
- Disconnect the injection relay, turn the key to ON and activate the relay through the diagnostics in-
strument.
- Verify the presence of voltage between relay connector PIN 86 and 85 toward the cabling.
- If no voltage is read, disconnect the control unit and verify insulation from battery positive of the relay
PIN 85 (or control unit PIN 22). If necessary, restore the cable harness.
Short circuit to negative:
- Disconnect the injection relay and the control unit.
- Verify ground insulation of the relay connector PIN 86 and 85 toward the cabling: if there is no insu-
lation, restore the cabling.
Open circuit:
- Disconnect the injection relay and the control unit.
- Verify continuity of the cabling between the relay and control unit: Relay PIN 85 - control unit PIN 22.
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:
- Disconnect the fan control relay and the control unit.
- Verify ground insulation of the cable between the fan control relay (PIN 85) and the control unit (PIN
24). Restore the cabling if necessary.
Open circuit:
ELE SYS - 111