3sge ECU help

[tractionfree]

quick question regarding the EFI circuit in a greytop beams ecu. does the FC output do anything other than close the COR relay powering the fuel pump?

long story short, im using a seperate fuel pump relay and so my FC wire is disconnected. i'm not getting a trigger signal to the injectors. are the two related? im wondering if perhaps if now the EFI circuit isnt closed and so the injectors get no signal?

[gt4dude]

the easiest way to do it without upsetting the ecu is to run the FP+ from your fuel pump as the new signal wire

I'm yet to dissect a loom but i believe COP(FC) is key on, power to electrics, power to ecu and from there the ecu sends out FPR signal

[Jonno2002]

fc ouput has nothing to do with injectors, 1st car i wired up ran 4 years with the fuel pump on the key, check all the wires to the ignitor are connected, ive fixed a 1ggte which had no injector pulse due to a severed wire to the ignitor.

[tractionfree]

ive fixed a 1ggte which had no injector pulse due to a severed wire to the ignitor.

the ignitor and the injectors are interconnected??

i've gotten a little further now, when i said i wasnt getting a signal to the injectors, i may have been mistaken. i didnt have an oscilloscope, so had been using a multimeter on AC mode to pick up voltage spikes. worked fine for ignition, but i've just realised that the duty cycle for injectors will be way too long to register as an AC pulse. i've unplugged the AFM so it's running on open loop now, to take any faulty sensors out of the equation

what im getting now is two to three pops after a couple of cranks, then nothing. grabbed the headers and #1 *felt* marginally warmer than the others, but not conclusive. the pops are spaced in such a way as to suggest its only one cylinder firing. just trying to work out why now...

also i checked the FC wire, and it is earthing as power comes on. so the fuel side of the ecu is definitely alive