APRILIA SHIVER 900, Service Station Manual

Page: 181 / 444

proximately 12 V, restore the wiring harness (there is a short circuit to battery); if 5 V, connect
a 10 kohm resistance to PIN 1 of the sensor connector and to he vehicle ground: if, with key
ON, the measured voltage upstream the resistance decreases, replace the instrument pan-
el; if it continues to be 5 V, restore the pink cable (there is a short circuit at + 5V)
Notes
In case of short circuit to ground detected at PIN 5 of the instrument panel connector, the display shows
the "-" indication for the air temperature.
Check the ground insulation of the sensor connector pink cable: if connected to ground, restore the
wiring harness; if insulated from the ground, check if the sensor resistance is correct: if not ok, replace
the sensor; if ok, replace the instrument panel.
Electric fan circuit
Function
Activates coolant radiator fan
Operation / Operating principle
When the ECU detects a temperature of approxi-
mately 101°C, it closes the connection between
the fan control relay excitation circuit and ground
Level in electrical circuit diagram:
electric fan
Position:
•
sensor: relay located in the front recess
of the chassis, to the right
•
connector: on relay
Electrical specifications:
•
relay normally open;
•
drive coil resistance 110 Ohm (+/- 10
%)
DIAGNOSTIC TOOL:STATUSES
Fan relay
•
on/off
DIAGNOSTIC TOOL:ACTIVATIONS
Fan
•
Energy is applied for 10 seconds to the
fan relay (36 in the electrical circuit di-
agram, position in the steering head-
stock recess, to the right; however,
SHIVER 900
Electrical system
ELE SYS - 181