Suzuki GSX-R750, Service Manual

Page: 165 / 495

4-18 FI SYSTEM AND INTAKE AIR SYSTEM
Output voltage
(V)
Lo
w
High
Low High
(High vacuum)
(Low vacuum)
Atmospheric
pressure(mmHg)
Resistance value
Lo
w
High
Temperature
Low
High
Thermistor
ENGINE COOLANT TEMPERATURE SENSOR (ECT SENSOR)
The thermistor resistance value increases when the engine cool-
ant temperature is low, and decreases when the engine coolant
temperature is high.
ATMOSPHERIC PRESSURE SENSOR (AP SENSOR)
The atmospheric pressure sensor is located beneath the left
side of the seat rail.
The sensor detects the atmospheric pressure. The detected pres-
sure is converted into voltage signal and sent to the ECM.
The injection time (volume) is controlled according to the voltage
signal (output voltage).
The voltage signal increases as the atmospheric pressure rises.
The engine coolant temperature sensor is installed at the rear
side of the cylinder head.
The sensor detects the engine coolant temperature in thermistor
resistance value, which is then converted to voltage signal and
sent to the ECM. The injection volume increases as coolant tem-
perature decreases.