Bad Circuit-open Relay Symptoms

THE1JZSPECIAL

Banned
Apr 28, 2008
111
0
0
South Florida
mobes;1044264 said:
Sounds like the fuel pump relay or the resistor is bad on the 6v side. The car runs it at 12v when cranking then kicks down to 6v at idle. If however you guys are 12v modded, then I'm out of ideas.


I did the bypass and the open-circuit realy is cycling closed but i put my big ear to the gas tank and no sound. im gonna be dropping the tank soon Mobes where is the resistor?
 

mobes

Supras are never 'done'
Apr 5, 2005
719
2
18
Bozeman, MT
THE1JZSPECIAL;1044409 said:
I did the bypass and the open-circuit realy is cycling closed but i put my big ear to the gas tank and no sound. im gonna be dropping the tank soon Mobes where is the resistor?

Passenger shock tower. The relay is there as well. You can unplug it and run a wire to bypass both.

Check this post for pictures of how to bypass them:
http://www.supramania.com/forums/showpost.php?p=887577&postcount=3

He ran a new wire to the pump as well, but jumping it as shown in the last 2 pictures would be a good start.
 

THE1JZSPECIAL

Banned
Apr 28, 2008
111
0
0
South Florida
mobes;1044420 said:
Passenger shock tower. The relay is there as well. You can unplug it and run a wire to bypass both.

Check this post for pictures of how to bypass them:
http://www.supramania.com/forums/showpost.php?p=887577&postcount=3

He ran a new wire to the pump as well, but jumping it as shown in the last 2 pictures would be a good start.

JUST DID THE bypass ont he resistor and fuel relay , the fuel pump is still slient . The tank is coming down '' Im going in scotie '':evil2:
 

mobes

Supras are never 'done'
Apr 5, 2005
719
2
18
Bozeman, MT
THE1JZSPECIAL;1044465 said:
JUST DID THE bypass ont he resistor and fuel relay , the fuel pump is still slient . The tank is coming down '' Im going in scotie '':evil2:

Might want to check for voltage at the pump first. There is an access panel in the hatch. Black/Red wire should have voltage.
 

87supraguy

New Member
Mar 4, 2010
808
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0
Tucson, az
3yrs later and I didn't see anyone resolve their issues!?? I'm having similar issues. Did my 1jz swap, no pow to fuel pump. No power at FP relay and resistor. Tried to jump B+ to FP but no power at B+. jump 12v straight to FP and I can hear tw fuel pump. I just finished up the 12v mod and still not working cause the COR isn't triggering the FP to turn on. Bad COR?