Triggering COR from FPC output of newer ECUs

[Shakotan_Aaron]

ah right, yeah that would make some sense i guess.

which? one at about the middle? first time ive dont this, only soldered wires together before.

[dori81]

i got my kit same as that and soldered it all up as required is it still useable without changing from bc549 to 2n7000? what does widening the duty cycle do? was that the only part you changed in the kit? also i just need to know what wire goes where

12+ from?
0v? earth to body?
input + what goes in there?
input- what goes in there?

NO where does that go?
COM where does that go?
NC where does that go?

if you could please let me know what parts to replace ill run down to jaycar today and source them so i can try and get this all done this weekend





EDIT NOW SOLDERED LINK IN whats left to do now?

[dori81]

OK so i went and bought a pack of RR0644 resistors and a 2N7000 N-Channel FET.

now in the picture below i circled a resistor is that the one i replace with one of the RR0644 (1M 1/2Watt Resistors)?

and regarding the bc549 i replace that with the 2N7000 N-Channel FET but when i install it i flip 180 degrees?

I KNOW im probably annoying some people but i have next to no knowledge of any of this and im trying to make it work for me i appreciate all the help and patience!

[auto351]

12+ from?
0v? earth to body?
input + what goes in there?
input- what goes in there?

NO where does that go?
COM where does that go?
NC where does that go?

12V+ == Connect to power (Via fuse) when IGN or cranking

0v == earth to body.
input + == Connect to Fuel Pump control signal (FPC, FPR which is the ECU output)
input- == NOT Connected (hence the under board link)

NO == Connect in series with fuel pump power.
COM == Connect in series with fuel pump power.
NC == NOT Connected

I also see the pictures above; if the last few are your finished board then the 2N7000 is not fitted correctly.

[dori81]

nah i havnt fitted the 2n7000 yet i have only replaced the 10k resistor with the 1m one, so do i just solder that 2n7000 the other way around on where the bc549 is so its backwards? and will NO and COM just get spliced into the fuel pumps power? that little black bit that you solder on is that a small fuse? does input + go to both fpc and fpr on the ecu aswell or just one of them? could you post a picture of you complete circuit board so i could compare? thanks

[auto351]

Yes solder the 2N7000 so it is the other way round to the BC549 screen printed diagram.
yes The NO and COM are spiced into the fuel pump power.
No That Black bit is just a plug and socked for maintenance (removal and testing).
some ECUs have different names for the Fuel Pump Control Signal but only connect the Input + to the one point.

This is fitted the my friends Supra so I cant get to it for better picture but post 22 above show the colour coding and you can see where the colours are connected is the picture of the circuit board.

[dori81]

ohk so i went over it all and soldered the 2N7000 in heres pictures of the complete thing finnished ready to be wired in tell me what you think? all good? i dont know what reverse the footprint ment i just flipped the 2N7000 180degrees
to how the old bc549 sat

[auto351]

Perfect,
Testing

Power up the board via IGN or battery (best to use a fuse)

Connect the Input+ to 12Vdc. (This is OK for a short Time @ 12V I = 12mA [Imax = 60Ma] )


if all is working the LED will light and remain lit for a short time after removing the signal.


its now ready to wire in the car

[dori81]

i wired it in today and it didnt work! apparently cause i got a jzx90 engine+ecu it wont work? no cor or something? due to them having there own fuel ecu in the boot origionally. i might have to try tachometric relay setup but i donno where ill wire coil - im going to source a vk tachometric relay seems to be the go. if anyone wants this $20 and ill post it ya hahah!

[takai]

Thats the whole point of this circuit, it triggers a COR/Fuel relay from the FPC (fuel pump controller) pin. That pin goes to the fuel ecu....

[dori81]

maybe the i soldered my kit up wrong? cause when i go to test it straight on to my battery i get nothing and when its connected its only ever intermittent and doesn't send power to my fuel pump i had it all dummied up made sure there was good connection and it still didn't work :S i had it connected to my fpc pin on my ecu then i bridged NO and COM together and ran it to the fuel pump power wire i had power coming from igntion just before the start signal and earthed it straight to the body. i did a year of auto electrical so i have a very simple knowledge of it

[dori81]

have a look under where i soldered my link to the signal and where auto351 soldered there link to there signal ive soldered the pin to the negative input he hasnt should this matter?

[wilbo666]

Have you connected the engine ECU DI pin to +B power (or ignition & crank power)?

On some engine ECUs if DI pin isn't connected to power the engine ECU wont pulse the FPC output pin...

wilbo666 / Toyota FPC to COR Wiring

Cheers
Wilbo

[dori81]

i think i might just got for the tachometric relay option it seems alot easier i dont think im any good at soldering haha. what have other people done in the past fuel pump wiring wise theres been alot of 1jz cressi conversions done surely a majority isnt stupid like me and are running there pump hard wired

[Packy]

i did notice that these a 1.5-2second delay between start cranking and firing? is this normal?

In the first photo from auto351, if you look to the right of the circled component there is a small jumper link just to the right of the IC, like that you would see on a computer motherboard or old hard drives. If you remove this link, it makes the unit switch on instantly, with the link installed it enables the delay in switching of about 1-2 seconds.

I built mine yesterday and installed it, works perfectly and makes me rest easier knowing that it's no longer wired straight to ignition.

I know this is an oldish thread but thought it relevant to tell people what I found regarding it as it is still something that people are using/installing.

EDIT: Can't believe this is my first post since joining over 4 years ago!