Joyner JNSZ1600QL Owner's Manual page 122

Fig.173
5. Ignition advance calculation and high voltage distribution
The system uses two high tension ignition coils and assigns ignition voltages directly to spark plugs by
static electricity (distributorless ignition) directly. Connector and controlling triode are comprised in the
ECU injection system and connected to ECU connector 1 and connector 19 . (figure. 175).
When ECU microprocessor identifies the signals of two tooth-missed signals, it will begin to count
tooth. Cylinder 1 or cylinder 4 TDC comes after 20 teeth are counted. Cylinder 2 or cylinder 3 TDC comes
after 50 teeth are counted (determine by pair).
ECU calculate the primary coil conductivity of cylinder 1, 4 or cylinder 2, 3 and ignition advance
according to the gained parameters (pressure, rpm) and calculate the dynamic compensation according to
the engine working condition.
The following is for checking primary coil and secondary coil resistance.
Fig.174
Fig.175
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