1800Ti Fuel Pump ECU problem

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Re: 1800Ti Fuel Pump ECU problem

Post by scimjim » Wed Apr 11, 2012 11:22 pm

Ok - but they're all fairly low current ECU feeds aren't they?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
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1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: 1800Ti Fuel Pump ECU problem

Post by peter freeman » Thu Apr 12, 2012 9:48 am

They look to be low current feeds but there is no explanation that I can find which tells you exactly what they are for. I have taken the top off my spare ECU and it is different to the one shown on the previous page - this ECU came out of a Silvia so I assumed it would/will work ok. I do have yet another one which came out of a SS1 ( I had to repair it but the fault was nothing to do with the pump feed ) but I won't be able to get at it for a couple of hours.



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Re: 1800Ti Fuel Pump ECU problem

Post by scimjim » Thu Apr 12, 2012 9:58 am

I have a Nissan manual - I think it lists pin functions in there? Will try and look tonight.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: 1800Ti Fuel Pump ECU problem

Post by peter freeman » Thu Apr 12, 2012 10:09 am

Cheers Jim - all useful info.



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Re: 1800Ti Fuel Pump ECU problem

Post by peter freeman » Thu Apr 12, 2012 11:20 am

OK more confusing - the ECU I have now looked at and which came out of a SS1 is near to the Silvia one I acquired than that on the previous page - the numbers on the box are 96 and 237810 33F00 on the SS1 and 97 237810 33F10 on the Silvia one. The resistor in the same place ( see photo ) is a 4.7Kohm which cannot be the one in line with the fuel pump - too high a value.
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ECU.jpg
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Re: 1800Ti Fuel Pump ECU problem

Post by philhoward » Thu Apr 12, 2012 11:27 am

I thought it was the 0.1 Ohm one that burns out? As you say, a 4.7k shouldn't burn out on a 12v system...ever!


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Re: 1800Ti Fuel Pump ECU problem

Post by peter freeman » Thu Apr 12, 2012 11:33 am

On the other picture there are two 0.1ohm resistors - just the one above which looks to be 1/2watt at a guess - there is plenty of space to have it away from the pcb.



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Re: 1800Ti Fuel Pump ECU problem

Post by sabre1800ti » Sun Feb 15, 2015 8:06 pm

I came across this topic when searching for fuel pump info.
One of the jobs I have lined up is to fit an inertia switch in the fuel pump circuit.
Please excuse me if I am talking rubbish as I not very good with electrics.
As previously stated there can be trouble with the ECU resistor burning out, so I was wondering if the cicuit below woukd be OK.
Image
(Apologies for crude diagram as I have no CAD programme)
I am assuming here that the ECU doesn't modulate the fuel pump but only detects that the pump is live.
Is the resistor there to "protect" the circuit board or to limit the pump for a longer life?
Also any suggestions as to where is the best place to mount the inertia switch.


Doug Black
Ex-Factory 1993 Scimitar Sabre 1800Ti Mk 1

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Re: 1800Ti Fuel Pump ECU problem

Post by scimjim » Sun Feb 15, 2015 8:31 pm

The original wiring in your schematic is wrong - the fuel pump receives an ignition switched live and it's the negative that's switched by the ECU.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: 1800Ti Fuel Pump ECU problem

Post by sabre1800ti » Sun Feb 15, 2015 9:14 pm

Image
Is the yellow now correct for original wiring.


Doug Black
Ex-Factory 1993 Scimitar Sabre 1800Ti Mk 1

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Re: 1800Ti Fuel Pump ECU problem

Post by scimjim » Sun Feb 15, 2015 9:34 pm

Yes.

I suppose it would work just as well if you swapped the ECU in the original schematic for an earth point? Essentially that's what everyone does if the ECU burns out, simply bypass it.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: 1800Ti Fuel Pump ECU problem

Post by sabre1800ti » Sun Feb 15, 2015 9:59 pm

That would be a lot easier.
Thanks Jim


Doug Black
Ex-Factory 1993 Scimitar Sabre 1800Ti Mk 1

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