Quote Originally Posted by Six_Shooter View Post
In most non SFI OEM MPFI applications from GM, the ECM only had one injector driver. The only exception I can think of is the Turbo Sunbird, Turbo Grand Am, Sy/Ty and a Quad 4 application (Beretta?), that used the '7749, that has two injector drivers, but in saturated mode (Sy/Ty for sure), only one driver was used. in Peak and Hold mode (Sunbird and Grand Am), both injector drivers were used.
So inside the PCM there is only one driver for my 16168625 PCM. Then the control circuit for this driver must split inside and come out via two pins labeled "TBI A driver" coming out on pin A-16, and "TBI-B driver coming out on pin A-9. Or am I still lost?

Must be for some kind of LHM, in the event of one injector failing?

Thank you, I'm learning here!

Keith