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I supported Toymods
Location:
Frankston, Victoria
Registered:
April 2004
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URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 06:14
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Hey peeps,
Firstly I want to say thanks to all the peeps from these forums that helped me out, couldn't have done the conversion without yas.
I'm up to the absolute final stage of my conversion, just about to mount the fuel pump. After screwing up the wiring of my circuit open relay about 4 times, I finally looked deep at the wiring diagram and the plug pinout diagram and did it properly. With my multimeter in hand i turned the starter to check the output voltage... EXACTLY ONE VOLT?? Made me go "wtf?". Is this normal? Like is it meant to be only 1 volt while starting, then once the starter goes off and the engine raises above 5RPM and the ECU kicks it into action off the 12V EFI, it raises to 12V?
It's the last thing I need to figure out till i fill the tank and start the car, so I really want a fast reply on this.
Thanks heaps!
Kev.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 06:29
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what happens when you crank it over? and it is getting pulses?
the volvo ones have 12V... since it is basically a normal relay.. but also has a timed trigger for the crank pulses..
sure it's not fubar? got another one to try?
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I supported Toymods
Location:
Frankston, Victoria
Registered:
April 2004
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Re: URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 06:41
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Lol the car aint running yet, i need a fuel pump that runs before i can crank the engine over  .
But yeah as mentioned above, one of the triggers for the open circuit is the starter motor, but only EXACTLY 1v is getting through when i crank the starter. I'm not talking 1.02 or something, im talking 1.00000Volts... Kinda makes it seem like its meant to do that?
Kev.
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Location:
Brisbane
Registered:
May 2002
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Re: URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 07:38
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The starter signal should cause 12v to goto the fuel pump (not 1V), as should the AFM flap opening.
COR's are pretty simple, it is just a relay that triggers off the starter signal and the AFM...
Cheers
Wilbo
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 08:46
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Wilbo,
if he is using a MAP sensored engine that info doesnt apply
On MAP sensor Toyota engines, the COR is triggered by the "FC" pinout of the ECU. This FC output is an open collector, meaning than when triggering, it connects to GROUND.
Of the 5 wires, in most common systems:
# B-R => 12V ign power from EFI main relay
# B (or B-W on some) => Starter motor switch from keybarrel
# L-B (the blue wire ) => fuel pump power output
# G-R => FC pin trigger from ECU
# W-B => earth
So how does it work?
The toyota system does not run/prime the fuel pump prior to cranking the engine. It runs the pump whilst the engine is cranking, and then the ECU controls the fuel pump. It is a simple 12V on/off control.
Having the starter trigger to the COR is there to aid the fuel rail pressue and engine starting up whilst the engine is cranking.
You can cheat this by momentarily cranking the starter (short enough not to start the engine) and the pump will run for a couple of seconds before shutting off.
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Re: URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 13:13
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frosty, you don't need a circuit opening relay, and if you want one you can make one yourself out of two relays, as conceptually it is easier to understand and the opening relays can be unreliable.
My car and my mate's car trigger the fuel pump off the "engine running" signal, works very well in practice!
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I supported Toymods
Location:
Frankston, Victoria
Registered:
April 2004
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Re: URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 13:33
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Thanks heaps boys. Seems after looking at teh Witzl's post, I did have it wired up properly... Seems I'm looking for another open circuit relay, my one must be busted... For the moment I've done a hardwired relay triggered by the ignition switch, as unsafe as that is, it will only be temporary (ie. 1 or 2 weeks)...
Kev.
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Re: URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 13:36
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did you read my post? you dont need one
you can have the relay triggered by what its supposed to be triggered by, the opening relay isn't some magic thing, its jus ta pain in the asS!
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I supported Toymods
Location:
Frankston, Victoria
Registered:
April 2004
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Re: URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 13:43
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Lol, thats basically the same thing but with 2 relays instead of one f00 .
By "Engine running" signal you mean the FC connector in the ECU correct?
Kev.
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Re: URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 13:56
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should have been more clear, what i meant to say is that my car and my mates car only use one relay, its triggered by the output that goes to the opening relay that ISNT the start signal.
cant remember what its called
you only need to use one relay! totally fine!
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I supported Toymods
Location:
Frankston, Victoria
Registered:
April 2004
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Re: URGENT, help with circuit open relay output voltage...
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Sun, 09 October 2005 14:18
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Hmm.. If you can find out exactly where I'm meant to get the trigger on, that sounds great  .
Kev.
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