English
Is175 Rev. 240102 - 2
Pag. 28
Component Description
OXYGEN SENSOR
For the purpose of carburetion adjustments, the lambda sensor (Oxygen Sensor)
provides information to the computer about the quantity of oxygen existing in the exhaust
gases. If a high level of oxygen is present in the exhaust, the carburetion is LEAN (small
amount of fuel). If a low level of oxygen is present in the exhaust, the carburetion is
RICH (large amount of fuel). To sort out the signal carrier wire of an Oxygen Sensor, we
recommend using a digital multimeter. Set the instrument to measure DC; put a probe
to battery ground; with the other probe check which wire carries a variable voltage.
It is important that the Oxygen Sensor is hot before performing this test.
PROGRAMMABLE FUNCTIONS
VEHICLE CONFIGURATION
Oxygen Sensor type 0 ÷ 1 V
0 ÷ 5 V (Type A)
0 ÷ 5 V (Type B)
5 ÷ 0 V (Type A)
5 ÷ 0 V (Type B)
0,8 ÷ 1,6 V
O2 sensor reading delay (Open - Loop) 5 ÷ 1200 seconds
Type of O2 simulation Open circuit
Ground simulation
Standard square wave
Constructed square wave
DIAGNOSIS
O2 sensor inoperative Disabled by default
Oxygen Sensor lean for too long Disabled by default
Oxygen Sensor rich for too long Disabled by default
To have the alternative fuel level indication (C.N.G. or L.P.G.) it is necessary that the
GREEN and WHITE wires of the
“Leonardo”
are connected to a special sensor.
To adapt the
“Leonardo”
to the different types of sensors, it is necessary to select the
correct option by means of the laptop computer or the hand - held tester.
PROGRAMMABLE FUNCTIONS
VEHICLE CONFIGURATION
Alt. fuel level sensor type A.E.B.
0 ÷ 90 ohm
Non standard
Low fuel indication only
OPTIONAL CONFIGURATIONS
PETROL TO ALT. FUEL SWITCHOVER
Automatic switchover to petrol with low alternative fuel level
Level for petrol switchover 0 ÷ 255
FUEL LEVEL
SENSOR INPUT
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