APRILIA TUONO 1000 R, Workshop Manual

Page: 273 / 279

CYCLE PARTS
7 - 18
TUONO 1000
7.1.5. LAMBDA SENSOR
It measures oxygen content in the exhaust gas and provides
indirect information on combustion.
The oxygen sensor signal allows the ECU to continuously
correct the mixture strength in case it is not ideal or
stoichiometric (lambda setting).
To obtain an optimum mixture and a stoichiometric ratio it is
necessary for the quantity of air taken in by the engine to be
equal to the theoretical amount needed to burn all the
injected fuel.
In this case, the lambda factor is 1, i.e. the ratio between air
taken in by the engine and theoretical air necessary to burn
all the injected fuel.
λ
= 1 ideal mixture
λ > 1 lean/weak mixture
λ
< 1 rich mixture
Oxygen sensor with heater
Power supply: 12V.
Sensor tension between 0 and 1 V (measured across pins 3
and 4).
Heater resistance between 12.5 and 14.2 ohm (measured
across pins 1 and 2 at 20°C – 68°F)