A.E.B. AEB215 Manuel D'utilisation page 48

VEHICLE CONFIGURATION
List of Oxygen Sensors
• 0-1 V OXYGEN SENSORS
These sensors, while having a variable number of
wires, all have the same operation. The voltage on
the signal carrier wire while the sensor is hot
toggles between:
- 0÷0,2 V LEAN mixture
- 0,45 V cold sensor
- 0,8÷1 V RICH mixture
If the voltage remains steady on about 0,45 V
even when the sensor is supposed to be hot and
therefore the voltage should be toggling, it is
very likely that the sensor is malfunctioning.
• RESISTOR TYPE OXYGEN SENSORS
The FIRST of these sensor types is a 3-wire one
and usually carries these colours:
- RED heater
- BLACK 0÷1 V signal
- WHITE sensor ground
In this case, only the PURPLE wire of the LEONARDO
must be connected, and the GREY wire must be
isolated.
Program the system for the 0÷1 V SENSOR.
The SECOND of these sensor types is a 4-wire
one and the voltage toggles between 0÷5 V
(DIRECT) or 5÷0 V (INVERTED). To establish if
the sensor is of the DIRECT or INVERTED type,
proceed as follows:
- cut the signal carrier wire, which is usually BLACK
or YELLOW in colour;
- turn the ignition key ON;
- by using a digital multimeter, measure the voltage
present on the signal carrier wire towards the E.C.U.
as indicated in Figs. 2 and 3;
• if the voltage is 0 V, select 0÷5 V type B
sensor (Fig. 2);
• if the voltage is 5 V, select 5÷0 V type A
sensor (Fig. 3);
NOTE: the functions:
- 0÷5 V type A;
- 5÷0 V type B;
refer to oxygen sensor types that presently are
not on the market, thus they are not to be
considered. When these sensors become
available, this manual will be updated with the
appropriate instructions.
48 - 188
- SIGNAL WIRE BLACK or PURPLE
- HEATER GROUND
- SENSOR SIGNAL
- +12 V HEATER
- SENSOR SIGNAL
- SENSOR GROUND
- HEATER GROUND
- +12 V HEATER
- SIGNAL 0÷1 V
- +12 V HEATER
- SENSOR GROUND
- HEATER GROUND
- +12 V HEATER
- 5 V SENSOR POWER SUPPLY
- SENSOR SIGNAL 0÷5 V
VOLTAGE 0 V
SENSOR 0÷5 V type B
- HEATER GROUND
- +12 V HEATER
- SENSOR GROUND
- SENSOR SIGNAL 5÷0 V
VOLTAGE 5 V
SENSOR 5÷0 V type A
LEONARDO
WHITE
BLACK
WHITE
BLACK
GREY
WHITE
WHITE
BLACK
RED
WHITE
WHITE
RED
YELLOW
BLACK
E.C.U.
WHITE
RED
BLACK
YELLOW
E.C.U.
Is215-2 Rev. 110105-2
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