How many IGN Triggers on 1G

[4g63telantra]

On a 1G ecu (90), how many IGN outputs are there off the ECU??

 

[XtremeRS2gnt]

There are 2 ignition driver outputs, one for cylinders 1&4, and one for cylinders 2&3. They fire in wasted spark mode. 1&4 at the same time, then 2&3 at the same time. Driver signals from the ECU go directly to the Power Transistor Unit. Signals from the ECU are 5 volt high signals, to switch grounds inside the PTU, that energizes the coilpacks. When the 5v signals are lifted from the PTU(ECU goes from hi 5volts, to 0 volts ground), the ground signals from the PTU to the coilpacks are cut off, then spark fires. Wire colors from the ECU to PTU are yellow, and yellow/red

Yellow is for cyl 1&4 coil
Yellow/red is for cyl 2&3 coil