I would guess that Pin 10 is one of the inputs to a differential amplifier that measures the injector current across R409 along with R404, C405, R405 and C407
+1 on not measuring the floating input
This is my guess at how it works. They went to a lot of trouble to rapidly close the injector discharging through the 47 Volt zenner. The design was probably dropped as being over engineered and too costly
Quote:
Originally Posted by rick-l
This is what I was thinking. - RED T402-on +12 V on top of coil, ground on bottom CHARGE
- GREEN T404-on T402-off +12volts on both sides of coil HOLD Energy in coil decays only due to resistance in coil and driver
- BLUE T402-off T404-off Pin 1 totem pole output at ground. +12 on top of coil, +47 on bottom CLOSE INJECTOR , collapse field
Just a guess at how it works
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