Input-Output System; Throttle Position Sensor (Vta); Water Temperature Sensor (Thw) - Suzuki F6A Service Manual

VCC
VTA
E2
THROTTLE
SENSOR
LTG/R
GY/Y
BL/Y
COLOR CODE
LTG – LIGHT GREEN
GY – GRAY
R – RED
BL – BLUE
Y – YELLOW
V
T
A
OUTPUT
TERMINAL
VOTAGE(V)
FULLY CLOSED
THROTTLE LEVER TURN ANGLE
THW
WATER
TEMPERATURE
GAUGE
E2
LTG/W
BL/Y
WATER
COLOR CODE
LTG – LIGHT GREEN
TEMPERATURE
W – WHITE
SENSOR
BL – BLUE
Y – YELLOW
kΩ
(5.74)
THERMISTOR
(BETWEEN
THW–E2
TERMINALS)
RESISTANCE
2.28∼2.61
(1.15)
(0.584)
0.303∼0.326
0
20
TEMPERATURE
INPUT–OUTPUT SYSTEM
ECM
5V
VCC
26
VTA
33
34 E2
FULLY OPEN
( C)
40 60 80

THROTTLE POSITION SENSOR (VTA)

The throttle position sensor is installed on the throttle
body and detects the throttle opening in linkage with the
throttle shaft.
The throttle position sensor comprises of a potentiome-
ter which is linked with the throttle shaft. One end of the
resistor of the potentiometer that is linked to the throttle
shaft is supplied sensor power supply voltage (about 5
V) from the "VCC" terminal of the ECM, any other end
is grounded from the "E2" terminal.
When the slider slides along the resistor, the output
voltage of the "VTA" terminal of the ECM changes, and
the throttle opening is thereby linearly detected.

WATER TEMPERATURE SENSOR (THW)

The water temperature sensor is installed at the
intake manifold and is a thermistor in which the resis-
tance changes in accordance with the temperature of
the cooling water.
One end of the thermistor of the water temperature
sensor is connected to the "THW" terminal of the
ECM, and the other end is connected to the "E2" ter-
minal (sensor earth).
When the ambient temperature of the water tempera-
ture sensor changes, the resistance of the thermistor
changes, and the voltage applied to the "THW" termi-
nal also changes.
The ECM detects the voltage of the "THW" terminal
as the cooling water temperature.
Since the resistance of the thermistor decreases as
the temperature increases, the voltage at the "THW"
terminal becomes lower as the temperature is raised.
103