In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bennettdan wrote:

William, 
   Low Z injectors are called "Peak and Hold" the injector is switched on high for the first portion of the signal to overcome the internal spring then it switches into PWM mode to keep the injectors from obtaining to much current. See my attachment to understand what I am saying more. 
High Z on the other hand you can just turn them on and keep them on and they will not get to much current. 

 

But like I said you can use series resistors to limit the current the treat Low Z injectors like High Z.

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