103 12/04
SPIDER MAX 500
B
Sch. 11
TERMINALS
CONDITIONS
STANDARD
1 - 22
Key switch on the “ON” position
5 V
11 - 22
Open the gas valve gradually
V=gradual increase
18.
GAS VALVE POSITION SENSOR (T.P.S. = THROTTLE POSITION SENSOR)
18.1
Circuit diagram
The gas valve position sensor is assembled inside the throttle body and cannot be removed.
The sensor receives a 5V-supply from the central unit and transfer a gradually increasing voltage to the central unit
according to the opening of the gas valve. The central unit transforms the voltage into the angular inclination of the valve.
The engine rpm and the gas valve position are the two basic signals for the engine operation management.
In case of failure of the circuit, the injection led and the protections turn on. In these conditions, the engine operates,
even if not at its best, safeguarding the integrity of the catalytic converter.
The gas valve position signal is important especially in case of small openings of the valve; these are the conditions in
which the sensor works more often thus requiring frequent checks after covering a remarkable distance.
Parameters
Immobilizer
Errors
Delete errors
Active diagnostics
CO calibration
Main 3/8
Throttle
Pressure
Water temperature
Air temperature
Battery voltage
Injector
Errors 1/3 AM
In order to check the sensor and the circuit, proceed as follows:
Connect the diagnostic multimeter.
Move the key switch to the “ON” position, the emergency switch to “RUN” and lift the side stand.
Select the multimeter menu from the ”ERRORS” function.
Check whether the central unit detected any anomaly concerning the gas valve position signal.
CENTRAL UNIT
Central unit ground
Throttle
potentiometer
Air
temperature
sensor
Dashboard
connector
Engine
temperature
sensor
