Vespa LX 2012 User Manual

Circuit open or short circuit to negative:interruption of the circuit or null voltage between control unit
connector PIN 11 and 12.
Troubleshooting
Short circuit to positive:
- Disconnect the control unit connector and the sensor connector.
- Verify that there is no short to battery positive on sensor connector PIN 3 (corresponding to control
unit connector PIN 11); in the presence of short circuit, restore the cable harness.
- Verify that there is no short to battery positive on sensor connector PIN 4 (corresponding to control
unit connector PIN 12); in the presence of short circuit, restore the cable harness.
Open circuit:
- Disconnect the control unit connector and the sensor connector.
- Check the continuity of the cable harness between the sensor connector and control unit connector:
Control unit PIN 11 - sensor PIN 3 and control unit PIN 12 - sensor PIN 4. If necessary, restore the
cable harness.
- If the cable harness is intact and the error persists, proceed with the following checks.
Short circuit to negative:
- Disconnect the sensor connector and the control unit connector.
- Check the sensor connector PIN 3 from ground insulation. If there is no insulation, restore the cable
harness.
- Check the sensor connector PIN 4 from ground insulation. If there is no insulation, restore the cable
harness.
- If PIN 3 and PIN 4 are insulated from the ground and the error persists, this means that there is a
probable fault in the control unit.
P0135 Lambda probe heating - shorted to positive / shorted to negative / open circuit.
Error cause
Shorted to positive: excessive voltage at PIN 31 of the control unit connector.
Shorted to negative: lack of insulation from ground on the sensor connector PIN 1.
Open circuit: circuit interruption.
Troubleshooting
Shorted to positive:
- Disconnect the control unit connector and the sensor connector.
- Verify that there is no short to battery positive on sensor connector PIN 2 (corresponding to control
unit connector PIN 31); if there is a short, restore the cabling.
Open circuit:
- Disconnect the control unit connector and the sensor connector.
- Check continuity of the cabling between the sensor connector and the control unit connector: control
unit PIN 31 - sensor PIN 2. Restore the cabling if necessary.
Vespa LX - S 125 3V ie 150 3V ie (2012) Electrical system
ELE SYS - 105

Vespa LX 2012 Specifications

General

Engine Type	Single-cylinder, 4-stroke
Displacement	124 cc
Cooling System	Air-cooled
Fuel System	Carburetor
Transmission	Automatic CVT
Fuel Tank Capacity	8.6 liters
Seat Height	785 mm
Curb Weight	114 kg
Length	1, 770 mm
Width	705 mm
Height	1, 140 mm
Max Power	10.3 hp @ 7, 750 rpm
Front Suspension	Single arm with coil spring and hydraulic shock absorber
Front Brake	200 mm
Rear Suspension	Coil spring and hydraulic shock absorber
Rear Brake	110 mm drum