Joyner JNSZ1600QL Owner's Manual page 116

-Synchronous (for normal operation). Injector opening corresponds with every TDC.
-Not synchronous (for idling, cut-off, low speed, start operation). Injector opening is completely
controlled by time and not related to TDC signal.
ECU has a basic current control circuit to control fuel injector. The circuit produces the maximal
current (signal) at the first control order speed up the opening of injector. Once maximum current is
attained , the circuit will automatically change to and keep the current I=1A ± 0 .3 A(Mean).
Injection duration is showed on the 2-dimension figure as a function of engine speed and intake
manifold absolute pressure. After engine warming up or speed turns to be stable, injection duration is 1 ～
4mS.
Injection duration is increasing basically under special operation condition, such as accelerating, cold
starting, engine warming up. As accelerator pedal is released, fuel will be cut off. (ti=0mS). Running
condition and readjusting condition may be changed according to water/ intake air temperature or A/C
condition.
——intake air temperature sensor "ATS05"
It is consisted of N.T.C.(Negative Temperature Coefficient) thermo resistance and 2-way junction box
that are installed in the plastic setting molding case. Sensor resistance will changed with intake air
temperature.
2.2 Lower body (air system)—description and function of accessories Excepted that connecting throttle
valve to accelerator pedal by a lever, the following parts should be installed on the lower body. · t hrottle
valve position sensor · s tepper motor · h ot water loop near the throttle valve and idle air by-pass · a bsolute
pressure signal port in the lower throttle valve (necessary to be connected with pressure sensor) · P CV
recirculation pipe
——Throttle valve position sensor "PF2C".
Figure 166 shows the position sensor case structure, also the relationship between output characteristic,
Fig.165
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