94
12/04
SPIDER MAX 500
B
Sch. 9
15.
COOLANT TEMPERATURE SENSOR
15.1
Circuit diagram
The coolant temperature sensor assembled on the engine head provides all the indications for the digital instrument and
injection.
It is made of two electrically separated sections.
The injection section is made by means of a NTC sensor connected to a 5V-supplied circuit. The resistance change
cause a change in the circuit voltage, that can be combined to a temperature value.
The central unit uses this information to control the engine operation, optimising all the temperature values.
In case of failure of the circuit, the injection led and the protections turn on (continuous fan operation included). In these
conditions, the engine operates, even if not at its best, safeguarding the integrity of the catalytic converter.
The most difficult anomaly to correct is a wrong temperature reading included within the possible temperature value
range that may lead to a failure of the protection operation and/or a bad carburetion. The described anomaly is more
likely to occur during the engine start-up.
TERMINALS
CONDITIONS
STANDARD
4-22
coolant temperature
A sensor connected:
20° = 2500 ± 100
Ω
80° = 308 ± 6
Ω
CENTRAL UNIT
Central unit ground
Throttle
potentiometer
Air temperature
sensor
Dashboard
connector
Engine
temperature
sensor
Содержание SPIDER MAX 500
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