Wiring the 1UZ-FE into a Pre-89 Supra

[CheesePhantom]

No extra grounds that I'm aware of. In the dash, is your Black-Orange wire from pin 16 on B-1 connected to the Black-Orange wire from pin 11 on IJ2? That wire comes from your ignition switch, when its tuned to the on position it tells the ECU to kick the EFI-Main relay on, without it the engine will not run. Pre-96 1UZ igniter and fuel injectors get their power from EB2 in the engine bay. 96 and up igniter and fuel injectors get there power from IJ1 at pin 3 and pin 7 both Black-White color, in the dash.

Yup. I made a patch harness between the two, using 7M Harness connectors and SC400 body connectors.

I have like five wires connected to the Black-Orange wire, including:
- The fuel pump, which I've wired into a separate 30A relay; utilizing the 12 volt mod.

- The Black-Orange wire from IJ1
- Both Black-White wires from IJ1
- The yellow fuel pump relay wire from B-1, which has become obsolete

I've also made patch harnesses to merge EB1 and EB2 into the MA70 body harness/Fuse box.

I'm at a loss, man. I've looked over my wiring a million times and I can't find a reason why the ECU isn't kicking on. I could understand if the EFI Relay went bad, since the car sat for three years, but wouldn't the ECU still turn on (CEL at on position) with a bad EFI Relay?

 

[Chambers]

Looks like you did a nice job on your swap harness. If the EFI main relay does not kick on then the ECU will not see any power. Pull the relay and test it. I had an 89 that wouldn't kick the EFI main relay turns out the ignition switch went bad, one of the terminals corroded and fell apart. That caused the 7.5a IGN fuse to blow, witch ultimately kept the ECU from getting power. Something to consider. Right now I suggest looking over your engine bay wiring.

 

[CheesePhantom]

Looks like you did a nice job on your swap harness. If the EFI main relay does not kick on then the ECU will not see any power. Pull the relay and test it. I had an 89 that wouldn't kick the EFI main relay turns out the ignition switch went bad, one of the terminals corroded and fell apart. That caused the 7.5a IGN fuse to blow, witch ultimately kept the ECU from getting power. Something to consider. Right now I suggest looking over your engine bay wiring.

Thanks a lot, man; for the compliment and for the advice. I will test the EFI Relay and take a closer look at my engine bay wiring as soon as possible.

 

[4U2QUIK]

nice patch harnesses cheese

 

[CheesePhantom]

Thank you, 4U2QUIK; and thanks again, Chambers. I started up my car for the first time today; as it turns out I made a mistake with the engine bay wiring. It's all fixed now.

[video]https://www.facebook.com/v/10151342644029547[/video]

 

[4U2QUIK]

same color as my first uz supra.

 

[White Zombie]

in your earlier post you were asking if the diagram had wiring for a cold start injector . I thought that was only on the pre 92 models, aka the LS400 ? Im buying a 1990 ewd for a 1990 ls400 . Only because that happens to be the Ecu and wire harness i currently have.

im still using a sc motor/ oil pan and all, just dont have the wiring ecu for it .

 

[4U2QUIK]

i'VE SEEN THE COLD START ALL THE WAY UP TO 94.

 

[White Zombie]

Wow ! Fail ...

 

[Chambers]

Thank you, 4U2QUIK; and thanks again, Chambers. I started up my car for the first time today; as it turns out, I made a mistake with the engine bay wiring. It's all fixed now.

Awesome! Glad to help!

 

[therenus]

what diferent's are between SC400 and LS400 wiring? in our country is SC400 litle rare so we have ls 400 engine

 

[4U2QUIK]

It's a huge difference and you're basically setting yourself up to do tons more wiring to get it to work with the supra chasis.
also you would still need the sc400 oil pan and pickup which are harder to find than an entire engine.

 

[SupraPieces]

Is there a drawing of how to wire the fuse box connectors or is that on the first page? My 1UZ came with a cut harness and no ECU so I have to do a lot of detective work to figure out what year my motor is and which plugs and ecu I need... anyone have any tell-ale info for me to verify what year mine is?

I will post some pictures if needed

 

[SupraPieces]

I know it's from an SC

 

[SupraPieces]

Can anyone tell me which ECU and PLUGS I should be pulling at a junkyard? My plan is to find one in a yard and cut the harness and take the plugs and ecu...

 

[Chambers]

On the SC harness the plugs are the same 92-97, after that it gets a little fuzzy. I havent dealt with anything newer than the 97 EWD book and an actual 96 harness.

You will need dash plugs (5 total; 4 needed) IJ1, IJ2, IK1, IK2, and II1 if you want to control your heater valve. In the SC they are a PITA to get to/out but its possible withoud removing the dash. In the engine bay you only really need EB1 and EB2, In the SC its located on the front of the fuse box.

The diagram at the bottom of the first post shows the EFI wiring layout in the engine bay (fuse box), the starter goes through EB1 but its not on that schematic.

 

[Chambers]

Just added a new wiring diagram to post 1:

1987 Supra to 1993 LS400 1UZ-FE (This diagram is subject to change, since I have not done a LS400 1UZ-FE swap yet it may change as others give me input)

 

[4U2QUIK]

the ls400 harness is a lot different from what I recall.

 

[Chambers]

Just updated a few missing images, should be good now!

 

[JJBToyotaSupra]

1987 Supra to 1993 LS400 1UZ-FE (This diagram is subject to change, since I have not done a LS400 1UZ-FE swap yet it may change as others give me input)

Is there any way to fix this dead image? Or pm it to me?