1990 UCF ECU Wiring Diagram

[GhostRunner]

Hi Everybody,
I hope that someone can help me out.
I have a ucf11 Conversion happening but to keep me happy I am looking for a diagram or even just the pin outs for this vehicle's ECU.
I have studied the diagrams on here but they all show a fuel pump controller.
Mine is the 2 speed relay version.
To Clarify I need one to suit,
ECU Number 89661-50100
26p 16p 22p 26p (Last plug is upside down)
Does not have a fuel pump controller,
Use's single wire 02 Sensor's both pre. and post Cat. Converter's

Any Help would be most Thankful.

Doug

 

[George_R]

go visit ls400.ru , open service manuals for '90ish LS400's
see what's listed for sfi system - you'll find engine control unit pinout, that's enough as the rest can be figured out from asome other UCF10/20 / ls400 series diagrams

 

[GhostRunner]

Thanks George

I remember seeing some information about this site back in the early days when I was researching.
Looking at these diagrams I see that the main ox1 and ox2 sensors are heated.
The main signal wires for these are the same as mine. The Heater circuits are not pinned on mine.
The subs are a different colour code so I will back probe these on the car to confirm their locations.

Thanks for that. MUCH appreciated.

What I am now going to do is splice it all into my 1991 4Runner management system through the main interface plugs near the ECU.
This confirms now how easy it is. Without hacking the original loom plugs off.
With a few re routing issues for the oil gauge sender and a couple more.
Keeping it almost like factory.
I hope.

07072013

For those who wish t know.
On my configuration,
1990 - 91 UCF11 "FM" Code PCM,
The two sensor's after the cat converters are heat sensors.
They are there to stop or prevent the cats from overheating.
I am yet to confirm what range they are but according to my multimeter
they are pyro sensor's. Not Oxy.
I am at the stage now where I am going to start and build my own headers.