900 S Convertible L4-2290cc 2.3L DOHC EFI (1997)
Radiator Cooling Fan Temperature Sensor / Switch: Description and Operation
GENERAL INFORMATION
The temperature sensor informs the Integrated Central Electronics (ICE) module about the coolant temperature.
This information is then sent to the main instrument in the form of a PWM signal when the ignition is in start or drive position.
MAIN INSTRUMENT 1
In main instrument 1, control of temperature indication is in the ICE, ie the breaking points in the temperature indication are directly programmed
into the ICE, which sends information to the main instrument via another PWM output. If the signal from the temperature sensor falls below -60°C
(-76°F) or goes above +160°C (+320°F), i e outside the temperature range, for more than 0.5 seconds, the ICE will set the pulse ratio at 5%.
If the temperature signal is above +160—C or below -60—C, the ICE presumes that there is a short circuit in the temperature sensor or that there
is an open circuit in the circuit and a diagnostic trouble code is initiated.
MAIN INSTRUMENT 2
In main instrument 2, control of temperature indication is in the main instrument.
The PWIM signal from the ICE has a frequency of 122 Hz and varies linearly between a pulse ratio of 10% and 90%, but the main instrument sets
breaking points at certain temperatures to keep the temperature gauge needle horizontal within the engine's normal temperature range.
