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Originally posted by streetlightning
the relay info i have i have addapted from reading on Mega manual and the schematics that are floating, butim not that confident, so i guess i was lloking for a yes that looks correct lol.
No, it doesn't look correct.
Your Megasquirt ECU should be switching at least a fuel pump relay and an ASD relay, but possibly a fan control relay as well. The Megasquirt ECU should be receiving its switched +12V power directly from the ignition switch.
Originally posted by streetlightningAs for when i had it serviced, i thought having the tach work was standard. unfortunalty this opens up more issues for me. i bought this unit of a member here that tach was working on, and it had been modded according to the sticky "no tach spikes" ect, so im a little conffused on why i wont have a tach signal if this was modded for one. when i sent it to have a diagnostic run, was anything removed? and since theres not alot of room left, what are my optins for getting a tach signal?
I don't know the specifics of your ECU, I'm just basing my comments on the pictures you posted.
"No tach spikes" indicates the ECU will more consistently read the signal from the crankshaft angle sensor; it has nothing to do with providing a signal to the tachometer. Like I said, you should be able to use a GPO as a tachometer signal source, you just might have to add a 1k ohm pullup resistor (this can be done internally or externally).
Originally posted by streetlightningIll be blunt, the FSM has a lot of sweet info, but reading the eltrical readouts is murder. i like how some connectors have nice pin outs, what whires where and what they do , others good luck. Ive been looking at the fsm for 2 weeks trying to awnser my own ?s and im still not getting all the awncers i needed, not trying to come off as a jerk, but ive really tried to be as independant as i can with researching lol.
Most all of the information you need is in the FSM. I understand it can be confusing if you're not accustomed to automotive electrical schematics. Don't just stare at them hoping something will "click," read the information at the beginning of the circuit diagrams section. The diagrams contain everything from connection information and connector pin assignments to wire colors.
Originally posted by streetlightningon the MS 3 wiring diagram in that link, the fuel pump relay has a wire going into the db37 connector, is that the fuel pump wire?
Yes.
Originally posted by streetlightningis that wire grounded?
Yes.
Originally posted by streetlightningor will that "fuel pump" wire be my trigger instead of the ignition?
I'm unsure what you mean. Your Megasquirt ECU will provide the relay a path to ground when necessary (i.e. whenever it reads a signal from the crankshaft angle sensor, and once upon power-up to prime the fuel system).
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-Paul
Service Manuals and Guides
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