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Within the past week I spent hours poring over a 2013 Ford Motor Company patent that suggests otherwise. The patent was on a different technology, but referenced this topology to substantiate their claims (which suggests it was nothing new in 2009 when the 2013 patent was granted). There is a shunt resistor between the IGBT that drives the injector and ground. The ECU monitors the top side of that shunt resistor (an ADC input) to determine current flowing through the injector (Ohm's Law). It can also detect when the injector opens and closes. This supports, not only our results in testing, but our logical reasoning as to why the IXRs work.
Isn't there an OBD II DTC for shorted injector?? How would the ECU know????
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Recovering Gasaholic
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