Lambda Sensor - Malaguti Dune X 125 Service Station Manual

Electrical system

Lambda sensor

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.
Level in electrical circuit diagram
Lambda probe, Injection utilities relay
Position

Sensor: exhaust duct

Connector: underneath battery, behind
headstock, RH side
Electrical specifications

Heater circuit: 12 -14 Ω at 20 °C (68 °
F)
Pin-out:
1. Heater power (A)
2. Heater ground (B)
3. Sensor signal + (C)
4. Sensor signal - (D)
Diagnostic tool - Electrical errors
Check the air-fuel ratio / Lambda probe P0130 - short circuit to positive / open circuit, short circuit to
negative or mixture excessively lean / signal not plausible for abnormal title correction or probe signal
fault.
Cause of error
ELE SYS - 90
Dune 125 - Dune X 125 - Euro 4