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NEVADA 750
NAVIGATOR:PARAMETERS
Air temperature
In case of failure, the value set by the control unit is 20 °C (68 °F)
NAVIGATOR: ELECTRICAL ERRORS
air temperature sensor open circuit, shorted to positive / shorted to negative.
Error cause
Troubleshooting
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 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
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Grey (cable harness side): Ground connection
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Pink/black (cable harness side): 0-5 V signal
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If the circuit is open, shorted to positive: excessive voltage has been detected at PIN 18 of
the control unit connector.
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If shorted to negative: voltage equal to zero has been detected at PIN 18 of the control unit
connector
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If the circuit is open, shorted to positive: check sensor connector and Marelli control unit
connector; if not OK, restore cable harness; if OK, check sensor continuity; if it is not OK,
replace the sensor; if it is OK, check the continuity between PIN 18 of the control unit con-
nector and the PIN related to the pink/black cable (cable harness side) of the sensor: restore
cable harness if there is not continuity; if it is OK, reconnect the control unit connector and,
with key set to ON, check continuity between the PIN related to the grey cable (cable harness
side) of the sensor and the vehicle ground connection: if there is not continuity, restore cable
harness; if there is continuity, it means that the error cause is a shorted-to-positive cable;
therefore, restore cable harness between PIN 18 of the control unit and the PIN related to
the pink/black cable (cable harness side) of the sensor. If the engine temperature sensor
error is displayed at the same time, it means that there is short circuit to positive in the grey
cable of both sensors.
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If shorted to negative, check sensor correct resistance: if resistance = 0, replace the sensor;
if resistance is correct, it means that the pink/black cable has ground connection: restore
the cable harness
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Electrical system
ELE SYS - 45
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