Joyner JNSZ1600QL Owner's Manual page 119

The fuel pump signal is timed. Once ignition switch is on and engine is not started, there will be a fuel
pump signal within 10 seconds.
Under the engine running and starting conditions, the fuel pump signal will not change.
3.2 fuel filter
Fuel filter (see drawing 143) is connected between fuel pump and the fuel intake port of the throttle
valve body. It comprises an aluminum case and a bracket with a stainless steel in it. for the high sensitivity
of fuel injector and the the existence of external impurities being in the fuel system, it is necessary to use
the high-efficiency paper filter core.
4.1water temperature sensor"WTS05"
During cold starting and engine warming, ECU enrich the mixture according to the signal (see figure
61) from the sensor. When engine is warmed enough for fan to reach the operation range, the enrichment is
zero.
4.2 speed, top dead center and
Sensor is mounted on the cylinder block by a mounting bracket. When it detects the impulses produced
by the teeth (60—2) in the flywheel (see figure. 169), engine speed may be calculated accurately by the
signal impulses produced by the 58 teeth which are arranged equally with a interval of 6 ° .
The RPM sensor position in the flywheel (signal wheel) is on the surface of the twentieth tooth before
the top dead center of the cylinder 1, 4, the angle between it and the top dead center of cylinder 2, 3 is 80 ° ,
on the opposite of the fiftieth teeth (tooth counting begins from the tooth-missed area), except for deciding
cylinder 1,4 and cylinder 2,3 TDC, the sensor signal (see figure. 170) is also used in the microprocessor ：
—— Control ignition (ignition advance and ignition delay)
Fig.168
y nchro pickup"CVM01"see figure. 170
s s s s
Fig.169
Fig.170
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