wiring my 1jz,

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I’m wiring my 1jz, my harness was sourced separately I have not been able to find body connector diagrams for this harness. So in tracing every body wire and making a diagram, and im running in to problems with even this task. First 3 coils and 3 injectors are grounded together and the other 3 are on a separate ground paired in 3s as well. And I don’t know where to put the two wires the 7m only has a spot for one.

I don’t expect anyone to know about my problem, I will in time decode this wiring mess what I’m asking is if anyone can move my headache along faster with a wiring diagram for the body pins that look like this.

Look carefully its not been easy to find out what harness this even is (I don’t know). The IH1 is totally different and most of the body pins are different to. I’m tired of looking and just want info, if anyone has a diagram for this harness please let me know. Or if anyone has ever wired this harness let me know that it’s even possible.

 

[10secdream]

Well we need to know what harness you have. You realize that the 1JZ was put in many different cars. Post some pictures of the harness and then we can point you in the right direction. By the sounds of it you do not have a 1JZ Supra harness.

 

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try that first post edited, sorry url was changing

This is the best pic of the harness I have, I would think someone could identify it off this pic. Other than these shown the ecu connectors are same as jzz30/ JZX90 the four row pin. Beyond that most of the sensor connectors are the same as the cut , jzx90 harness I have. Most meaning the map sensor plug is different, than the map sensor I have.

Can anyone convert this if I send it to them? I know there’s some one in here that does this. I know my thoughts and questions are all over but maybe if I knew what harness this is then I could find a good pin out. If I had a good pin out I would do it myself.

 

[tsupra]

you have a harness from a soarer. the big white one is C12, engine harness to instrument panel harness. the orange one is C11, engine harness to instrument panel harness. the grey one with 3 rows is CF2, engine harness to cowl harness. the grey one with 2 rows is CF1, engine harness to cowl harness.

 

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I found what I was looking for here http://www.supraforums.com/forum/showthread.php?t=511695&page=2&highlight=soarer+1JZ+MA70

Most where right I hope, I checked every wire to make sure it was right and found some things I did not like and changed it accordingly. One thing I’m still confused about is the 3 wire plug called “EB2” (engine bay) I don’t have one, mine is a 5 pin and two of the pins are “jumped” so really it’s only a 2 pin connector with one pin not used.

shown here top left.

showing black, black/red, and black/blue

black goes to starter, black/red goes to a lot of places, and the two black/blue wires lop only inches from connector. now following the guide i should do this...

• Black – yellow from old alternator plug and black from EB1
• White – white from old alternator plug
• Black/Red – Black/Red from C1 plug and Black/Red from EB1

so i was just thinking of lengthening the alternator wires will that work?

where do I wire the black/red and starter wire-black if i just lengthen the alt?

the other thing is the guide says to wire "Black/Red – Black/Red from C1 plug and Black/Red from EB1"
but my Black/Red from EB1 goes to the diag box to port "WA" then there is a jumper in the diag box over to "WB" then it goes to a wire i did not use on one of the body connectors. This can't be right why even wire it if it goes no ware?

where the EB1 black/red goes right lower.

 

[tsupra]

are these 2 on the same branch that comes off the engine and has a few plugs that go to the ignitor?

 

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yes, tracing the wires reveals that the one on the right has the right wires from the guide. but the other just confuses me.

 

[tsupra]

ok, the one on the left, with 5 pins, is listed as CA3, engine harness to engine main harness, for cars prior to jan. 94, the one on the right is listed as CA2, engine harness to engine main harness for all years. unfortunately the engine main harness i have has those 2 connectors cut off of it as well as the fuse box. so i need to know what they are as well. guess it's getting time to stretch all these harnesses i have out in the living room and figure out how to read this soarer schematic.

 

[tsupra]

looks like the black wire in CA3 comes from the normally open contact in the starter relay and goes to the starter. now then, in the CA2 plug, if you rotate it 180 degrees so the latch thingy is on top, and count from the top left over 3 pins, is that a black wire or a black wire with white stripe? a black wire should be there if that is an automatic harness and a black with white strip should be there if it's a manual harness. either way it should connect to the start terminal on the ignition switch after going through a fuse and the neutral swith if it's an auto and it should end up at the coil for the starter relay.

 

[tsupra]

does that black/red wire in CA3 go to the ISC, both +B1 locations in the ecu plug, a VSV, the O2 sensor and 1 other place, possibly the diagnostic block? if so then that's the wire that comes from the normally open contact on the main efi relay. it supplies switched 12 volt power to those items.

 

[tsupra]

the white wire in CA2 should go from the a.c to the relay for the a.c. the black with yellow wire in CA2 goes from the efi fuse to batt terminal at the ecu. the black with orange wire in CA2 goes from the m-rel terminal at the ecu to the coil of the main relay.

 

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thanks I got it all wired where I guess its suppose to go. I'm still wondering why the guide had me wire a black/red to a dead end wire unless I don't have my under dash wires 100%.
I'll find out in a few weeks if it works, if I ever find a trans that is.

It seems i just needed some one to think on the same track as me. thanks maybe you could tell me where your WA wire out of diag is going and what you did with it. I think its a blue wire.

 

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Update:
now that the engine is in the car I’m playing with trying to start it. I far as I can tell I’m not getting any fuel. And my cel is on. I also have not tested for spark yet. I have cranked the engine for long periods of time and I would think that I would smell lots of fuel, but I don’t. I tried to blink out the cel but its giving me the “every things ok code” (blinking nonstop). So I tried to make it blink out a cel to make sure the ecu was not just fried by unplugging the map. Now it blinks code 32 (Vacuum sensor signal fault) and 78( Fuel pump control signal fault). Then I get to thinking, check all Fuel relay wires coming from ecu.
I check D1 and FPC but my D1 coming out of ecu is not connected to anything. My d1 wire is pink and is not on the wiring conversions I have. Where does this d1 ( Fuel pump control relay) go to?
I also found that the WA WB connectors are for ABS

 

[tsupra]

well the soarer is supposed to have a fuel pump ecu, also called a fuel pump control relay. do you have voltage on that D1 wire while cranking? and have you tried putting the jumper in at the diagnostic block to make the fuel pump run?

 

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well the soarer is supposed to have a fuel pump ecu, also called a fuel pump control relay. do you have voltage on that D1 wire while cranking? and have you tried putting the jumper in at the diagnostic block to make the fuel pump run?

ok, I knew about both tryed to jump fpc and B+ and it did nothing. think Im going to go though the entire fuel system and check everything.

If I just jump the pump to a battery will the car even start or with ecu knowing about the problem is it not fireing the injetors?

I have been trying to search for the D1 plug but all I get is drifting sites.

 

[tsupra]

the soarer fuel ecu has 5 wires going to it, B from the main EFI relay , ground, FPC, D1 and a wire to the fuel pump + terminal. so, D1 goes directly from the ECU to the fuel pump ecu. i can't tell you exactly what that wire does just yet. it should either be signal wire from the fuel pump ecu to the ECU to let it know that the fuel pump is running, or it could be a wire that sends a signal from the ECU to the fuel pump ecu to make the fuel pump run at 9 volts like the 7m does. that's why you need to hook a volt meter up to that D1 wire to see if any voltage is there while you try to crank the car. if yes, then it's a low speed signal for the fuel pump. if not it might be the run signal. if the fuel pump is running and everything else is the way it is supposed to be then the car should run.
when you jumped B+ and Fp in the diagnostic block and turned the key to on did the fuel pump run?

 

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the soarer fuel ecu has 5 wires going to it, B from the main EFI relay , ground, FPC, D1 and a wire to the fuel pump + terminal. so, D1 goes directly from the ECU to the fuel pump ecu. i can't tell you exactly what that wire does just yet. it should either be signal wire from the fuel pump ecu to the ECU to let it know that the fuel pump is running, or it could be a wire that sends a signal from the ECU to the fuel pump ecu to make the fuel pump run at 9 volts like the 7m does. that's why you need to hook a volt meter up to that D1 wire to see if any voltage is there while you try to crank the car. if yes, then it's a low speed signal for the fuel pump. if not it might be the run signal. if the fuel pump is running and everything else is the way it is supposed to be then the car should run.
when you jumped B+ and Fp in the diagnostic block and turned the key to on did the fuel pump run?

Not it did not run when jumping from B+. I'm siting here going though wiring diagrams. Now I see that if that was not working than my efi relay needs to be checked.

also I think that the fuel pump ecu is for shuting off the pump in event of a crash.
thanks every one i let you know what i come up with.

 

[tsupra]

this just in, it seems the fuel pump ecu is nothing more that a relay and a few other electrical dodads, seems to do the same thing as the 7m fuel relay. at lower loads the fuel pump is run at 9 volts and at higher loads it gets a full 12. see this page http://web.ukonline.co.uk/soarertt/electrical.htm
the whole crash thing is a bit misleading. it seems that others that have used the soarer engine and ecu decided to wire the fuel pump so that it would run whenever the key was on instead of letting the ecu turn it on because no one gets that fuel pump ecu with their front cut since that part is in the back of the car. wiring it this way would let the fuel pump run if there were a crash and you didn't turn the key off. there is no reason you can't wire in a relay or 2, controlled by the ECU with the FPC and D1 wire to turn the fuel pump on and off like it's supposed to be done.