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Electrical system
Lambda sensor
Function
In charge of telling the control unit whether the
mixture is lean or rich.
Operation / Operating principle
The Marelli injection control unit reads and inter-
prets a voltage generated by the difference in oxy-
gen content between the exhaust fumes and the
ambient. 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
Location:
•
•
Electrical characteristics:
Heater circuit: 12 -14 Ω at 20 °C (68 °F)
Pin-out:
1. Sensor signal + (black wire)
2. Sensor signal - (grey wire)
3. Heater ground connection (white)
4. Heater power supply (white)
NAVIGATOR: PARAMETERS
Lambda probe
Example value: 0 - 1000 mV
If there is a short circuit at + 5 V or higher, the read value is equal to approximately 1250 mV (the
corresponding error will be displayed on the Navigator). If there is a short circuit on ground connection,
the read value is equal to 0 mV and the Lambda sensor correction parameter indicates 1.5: no error is
displayed, though.
Lambda integrator
example value: 1.00
In closed loop, the value must be close to 1.0 (values not within the 0.7 - 1.3 interval indicate a fault).
In an open circuit, the lambda probe signal is too low. Therefore, the control unit takes it as a lean
combustion condition and will try to enrich it. The value read will be 1.5
NAVIGATOR: STATUSES
ELE SYS - 46
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www.Manualslib.com
sensor: exhaust pipe
connector: next to the starter motor
manuals search engine
NEVADA 750
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