- Check the continuity of the cable harness between the sensor connector and control unit connector:
Control unit PIN 13 - sensor PIN 1 and control unit PIN 15 - sensor PIN 2. Restore the cabling if nec-
essary.
- If the cabling is intact but the sensor resistance value is incorrect, this means that the sensor is faulty
and must be replaced, otherwise proceed with the checks.
Shorted to positive:
- With the sensor connector and the control unit disconnected, verify that the fault is shorted with the
battery positive of sensor connector PIN 1 (or control unit PIN 13) and restore the cabling.
Shorted to negative:
- Disconnect the sensor connector.
- Check the sensor connector PIN 1 ground insulation.
- If there is no ground insulation restore the cabling.
- If PIN 1 is insulated from the ground and the error persists, this means that there is a probable fault
in the control unit.
LAMBDA PROBE
Function
In charge of telling the control unit whether the
mixture is lean or rich.
Operation / Operating principle
Based on the difference of oxygen in the exhaust
fumes and the environment, this generates volt-
age which is read and interpreted by the injection
control unit. It does not require an external supply
source but, in order to work properly, it should
reach a high operating temperature: that is why
there is a heating circuit inside.
Pinout:
1. Heater supply (1)
2. Heater ground (2)
3. Sensor signal + (3)
4. Sensor signal - (4)
ELECTRICAL ERRORS
Check the air-fuel ratio / Lambda probe P0130 - short circuit to positive / open circuit, short circuit to
negative or carburetion excessively lean / signal not plausible for abnormal title correction or probe
signal fault.
Error cause
Shorted to positive: excessive voltage at PIN 11 or PIN 12 of the control unit connector.
Electrical system Vespa LX - S 125 3V ie 150 3V ie (2012)
ELE SYS - 104
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