5-M11
ZD321, ZD326, ZD331, WSM
ELECTRICAL SYSTEM
[1] FUEL QUANTITY
■ Fuel Level Sensor
The remaining fuel quantity is detected by the fuel
level sensor installed in the fuel tank and indicated on the
fuel gauge. For detection, a float and a resistor are used.
As the float lowers, the resistance of the variable
resistor varies. The relation between the amount of fuel
and the resistance is as follows.
W1013985
[2] COOLANT TEMPERATURE
■ Coolant Temperature Sensor (Thermo Unit)
The coolant temperature sensor is installed to the
cylinder head of engine, and its tip is in touch with the
coolant. It contains a thermistor (4) whose electrical
resistance decreases as the temperature increases.
Current varies with changes in the coolant
temperature, and the increases or decreases in the
current move the pointer of gauge.
★ When galvarnometer shows 0 (Zero).
W1021761
■ Coolant Temperature Switch
The coolant temperature switch is installed to the
water flange of engine, and its tip is in touch with the
coolant.
The overheat alarm activates when the coolant
temperature goes up more than the specified value.
When the coolant temperature falls below the
specified value, the overheat alarm stops.
W1020324
F1/2
E (Remaining fuel of
approx. 5.0 L, 1.32
U.S.gal., 1.10 Imp.gal.)
1 to 5 Ω 28.5 to 36.5 Ω 103 to 117 Ω
Characteristics of Thermistor
Temperature Resistance of VR : ★ Condition
50 °C (122 °F) 153.9 Ω
(A)
80 °C (176 °F) 51.9 Ω
100 °C (212 °F) 27.4 Ω
120 °C (248 °F) 16.1 Ω
Condition Setting Value
(A)
R1 : 54.945 to 55.055 Ω
V : DC 6.9 to 7.1 V
(1) Terminal
(2) Insulator
(3) Body
(4) Thermistor
C : Coolant or Silicon Oil
G : Galvanometer
VR : Variable Resistor
F : Flow Velocity
(0.14 to 0.15 m/s)
Characteristics of Coolant Temperature Switch
Type
Operation Temperature
Horn operates Horn stops
Normally open
120 to 126 °C
(248 to 258 °F)
116 °C
(241 °F)
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