APRILIA DORSODURO 2007, Service Station Manual

Page: 101 / 302

If there is, it means that the control unit does not supply the ground connection and therefore
should be replaced.
•
If shorted to negative, check sensor correct resistance: if resistance = 0, replace the sensor;
if resistance is correct, it means that the cable has ground connection: restore the cable
harness.
NOTES No error is detected if the sensor does not work correctly or the control unit connector
or sensor terminals are rusty: then check through Axone if the temperature indicated is plausible
in relation to the ambient temperature. Check also that the sensor electrical characteristics are
observed: replace the sensor if not OK; if it is OK, check the sensor connector and the Marelli
control unit connector.
Lambda sensor
LAMBDA PROBE
Function
It tells the control unit whether combustion 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 wiring diagram: Lambda Probe
Location:
•
on the vehicle: exhaust pipe
•
connector: near the probes
Electrical characteristics:
•
Oxygen probe with preheating circuit
(power 7W)
•
It generates voltage within: 0 - 1000
mV
•
Heater circuit: continuity (7 - 9 Ohm at
ambient temperature)
Pin-out:
DORSODURO
Electrical system
ELE SYS - 101