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Ecu Help Fuel Pump Wont Prime Or Turn On!

1987 GT

By 1987 GT,
in General Maintenance

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1987 GT Rookie

1987 GT

Posted
Posted

just need help with my ecu as the fuel pump wont prime or turn on, i've put a rb20 silvertop in my passage and at some time along the way i fry'd a (diode, resistor or cap not 100% sure) on the curcut board just before it leads to pin 18 at the plug, Now the ecu wont turn the fuel pump on, just need to find out what type and size it is so i can get my fuel pump to prime again and not run constant

any way here's a few pic's

you can see were i've takin the part out on the board part R313

ecu1.jpg

it look's the same as the blue components labeled a

ecu2g.jpg

the lil bugger that don't work no more

photo571k.jpg

any help would be great i'm mainly after the size of it

1987 GT Rookie

1987 GT

Posted
  • Author
Posted

its a resistor fo shiz. is there not any writing on the device? or has it all been fried beyond recognition?

thought so but does'nt hert to ask, it's been fried beyond recognition, the size is the main thing i'm after

markdem Community Regular

markdem

Posted
Posted

your best bet might be to wait until someone can give you a definite answer, but i dont think many people will be willing to take their ecu apart. honestly id take a bit of a stab at it. if all the other similar-looking resistors all have the same resistance value, i'd go ahead and chuck one in.

i dont know much about resistor wattage interchangeability, but in theory, one could place a higher wattage resistor in the circuit without causing an issue... hopefully :ermm:

1987 GT Rookie

1987 GT

Posted
  • Author
Posted

thats what i'm hoping for, its only 4 srcew's and if someone has one out of a car it should be no big issue to just have a look.

there all different resistance but i think it is i higher on around the 400-500 ohm's my guess is, it's a 2w resistor but i can only get 5w which should be no problem as the only diff is that it can take more heat and current, i've poped down to jaycar and got a few diff size's all ready, just hoping i can that actual resistance before i wack one in there.

BH_SLO32 Proficient

BH_SLO32

Posted
Posted

cheers dude pm sent and yer its a 32 engine

I am guessing that the original R31 ECU fuel pump wire was directly connected to the R32 pin 18 which caused it to blow? If so I gather you have now added a relay and have wired pin 18 to the switch the relay on/off. If you haven't you will need to add a relay.

Cheers

1987 GT Rookie

1987 GT

Posted
  • Author
Posted

I am guessing that the original R31 ECU fuel pump wire was directly connected to the R32 pin 18 which caused it to blow? If so I gather you have now added a relay and have wired pin 18 to the switch the relay on/off. If you haven't you will need to add a relay.

Cheers

i've got a 040 pump so i all ready had a relay, i ither put the battery on backwards or crossed the wire's the wrong way out the relay caused it to blow. I now have to find that resistor size to replace it
  • 1 month later...
1987 GT Rookie

1987 GT

Posted
  • Author
Posted

sorry for the late update but big thanks to BOOZTJUNKEY for giving me the size of the resistor (5.1 ohms) as it done the trick with my ecu and now works properly again :cheers:

here's a pic of the final job

photo608.jpg

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