Fitting EFI harness

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Zcar_Lover - 10 Oct 2004 01:32 GMT

Hello all.
I am about to install the EFI system out of an Australian '79 280ZX
into a Aussie '77 260Z.
I have it all sorted out except the 3 pin plug near the ECU unit.
I have traced one pin to the start from ignition switch. Another to
batt -. So I expect the remaining pin is to the ignition ON position.
Would this be correct?

BTW on this harness there is NO connector to plug into the fuel pump
relay which on some models is near where this 3 pin plug is located.

Thanks for your assistance

Cheers

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Steve T - 10 Oct 2004 07:09 GMT

> Hello all.
> I am about to install the EFI system out of an Australian '79 280ZX
[quoted text clipped - 6 lines]
> BTW on this harness there is NO connector to plug into the fuel pump
> relay which on some models is near where this 3 pin plug is located.

If it's a blue wire (US models are this color), it's for the ignition signal
(negative side of the coil) to tell the ECU what RPM the engine is turning.
The system gets battery power from a fusable link to the battery itself via
a relay close to that area on the US ZX's. Inside the car it gets a key on
signal, a start signal and the ignition pulse signal.

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Steve

http://www.atlantaracing.com

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Zcar_Lover - 10 Oct 2004 10:48 GMT

>> Hello all.
>> I am about to install the EFI system out of an Australian '79 280ZX
[quoted text clipped - 12 lines]
>a relay close to that area on the US ZX's. Inside the car it gets a key on
>signal, a start signal and the ignition pulse signal.

Thanks for taking an interest Steve. I should have been a bit more
specific.. There are 3 green wires into the 3 pin plug. Only one pin
is unaccounted for. The wire from the negative side of the coil is
black and in it's own plug. Then there is a blue and a red wire in a 2
pin plug that I have traced to + and - side of the battery through
fusible links. I have traced every wire except the wire from the ON
position of the ignition switch which ends up on pin 10 on the ECU
plug. There is a power relay nearby on the harness that the ON wire
from the ignition goes through according to the circuit chematic I
have. So I'm sure I'm right, BUT, I just would like to get
confirmation from someone before I actually try connecting and
powering up. I'd hate to fry the ECU etc.

It seems as though Nissan had different circuits for various countries

:-(

Thanks again.

Cheers

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Steve T - 10 Oct 2004 16:42 GMT

> On Sun, 10 Oct 2004 02:09:10 -0400, Steve T <fotocord@yahoo.com>

>>If it's a blue wire (US models are this color), it's for the ignition
>>signal (negative side of the coil) to tell the ECU what RPM the engine is
[quoted text clipped - 6 lines]
> is unaccounted for. The wire from the negative side of the coil is
> black and in it's own plug.

Then they are different... Sorry. I know on the US models a coule of wires
aren't connected to anything, like are diagnostic plugs or something?

On the power on wire, hook it up like that without the ECU pluged in and see
if the relay come on?

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Steve

http://www.atlantaracing.com

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Zcar_Lover - 11 Oct 2004 01:46 GMT

>> On Sun, 10 Oct 2004 02:09:10 -0400, Steve T <fotocord@yahoo.com>
>
[quoted text clipped - 14 lines]
>On the power on wire, hook it up like that without the ECU pluged in and see
>if the relay come on?

Ah That's a great idea and the answer to me problem. Thanks Steve I'll
definitely do that.

Cheers

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