•
Check the sensor connector and the ENGINE connector of the Marelli control unit.
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 Navigator if the temperature indicated is the same as the engine tem-
perature. 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.
Air temperature sensor
Function
it tells the control unit the intake air temperature in
order to calculate oxygen presence so as to opti-
mise the petrol quantity necessary for correct com-
bustion
Operation / operating principle
NTC type sensor (resistance sensor, inversely
variable with temperature)
Level in wiring diagram:
Temperature sensors
Location:
•
sensor: on rear side of the filter box
•
connector: on the sensor
Electrical characteristics:Resistance
•
at 0 °C (32 °F): 32.5 kΩ ± 5%
•
at 25 °C (77 °F): 10.0 kΩ ± 5%
Pin out:
1. 0-5 V signal
2. Ground connection
DIAGNOSIS INSTRUMENT: PARAMETERS
Air temperature
Example value with key ON: 26 °C (78.8 °F)
In case of recovery, this value is set by the control
unit
Air temperature pre Recovery
Example value with key ON: -40 °C (-40.0 °F)
RSV4 Factory a-PRC Electrical system
ELE SYS - 183
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