[Z3R0_F0UR]

Well it’s been quite a while since i asked why questions and this should be my last hopefully , are there any wires I need to run in the ECU adapter for the OBD port besides the ones on the wiring diagrams that 1998Prizm linked me to? There was 4 OBD wires on the matrix side and 2 on my prizms side , I have the two prizm wires connected but there’s still two other matrix ones???

 

[1998Prizm]

Iirc, you have to run them straight to the OBD port, but they're not 100% necessary to run the car.



What are the extra Matrix wires called? And did I send you the OBD diagram? If I didn't, I'll send it over.

 

[Eliezer claudio]

Hey, I've done that exact swap. A 03 Matrix ECU or 00-01 Celica ECU will be better. For wiring, don't bother swapping out the harness. It's best to leave it completely stock and build an adapter. I have all the wiring diagrams you need. I have been working on a full DIY guide on the entire swap, I'll polish it off and post it soon.

Hey Can you send The diagram

 

[Z3R0_F0UR]

Iirc, you have to run them straight to the OBD port, but they're not 100% necessary to run the car.



What are the extra Matrix wires called? And did I send you the OBD diagram? If I didn't, I'll send it over.

Okay so comparing my diagrams you gave me between the corolla and matrix ECM , I’ve got four OBD pins
On the corolla there is
TE1
SIL
On the matrix there is
SIL
WFSE
TC
I have SIL connected but am wondering about the remaining 3
You mentioned “Iirc” I’m not sure what that is?
And if you could send the OBD diagram/s that would be fantastic![/QUOTE]

 

[Z3R0_F0UR]

I got the car all filled with fluids yesterday and after some trial and error she started up she was running rough but I think there’s just air in the fuel line still. I didn’t run it very long because open header in small garage but very very exciting.

 

[1998Prizm]

Have you flipped the TPS wires? If they're not flipped, that could be causing your rough running issue.
Here's a video on how to do it:

 

[Z3R0_F0UR]

OKAY so turns out the idling problem was a ground LOLOL CHECK YOUR GROUNDS PEOPLE but now all that’s left is too relocate my battery (any advice on that is appreciated) and I need an exhaust from the down pipe down

 

[Z3R0_F0UR]

OKAY so turns out the idling problem was a ground LOLOL CHECK YOUR GROUNDS PEOPLE but now all that’s left is too relocate my battery (any advice on that is appreciated) and I need an exhaust from the down pipe down

OH and I need the obd wires , I’m getting an engine light which is expected because the down stream O2 sensor is just dangling but I want to double check it

 

[Z3R0_F0UR]

Great , went to start it this morning and it won’t stay on , revs up to 2k then dies , it kind of inconsistently runs with the intake off and will rev between 500-1700, it’s so weird it was idling fine and now it’s being wack, could low coolant be an issue I still have to fill it properly. There’s a single pin plug at the end of the coil pack harness plug thingy? Like there are four packs in a row then at the very end there’s a single pin plug , I have no idea what that is for or where it goes. I’ll try swapping the TPS wires and see what that does

 

[Z3R0_F0UR]

Great , went to start it this morning and it won’t stay on , revs up to 2k then dies , it kind of inconsistently runs with the intake off and will rev between 500-1700, it’s so weird it was idling fine and now it’s being wack, could low coolant be an issue I still have to fill it properly. There’s a single pin plug at the end of the coil pack harness plug thingy? Like there are four packs in a row then at the very end there’s a single pin plug , I have no idea what that is for or where it goes. I’ll try swapping the TPS wires and see what that does

I’ve come to the conclusion that the plug is for a pressure switch on the power steering pump

 

[1998Prizm]

If you haven't swapped the TPS wires, that's definitely contributing to the issue. The throttle position sensor on the 2zz throttle body is on the other side from where it is on the 1zz, so at idle it reads WOT and at WOT it reads ~11% throttle. This causes all sorts of issues, but its super easy to swap.

The plug you're explaining is definitely the power steering pump switch. It is used to idle up the engine when the power steering pump is used. If you idle your car and move the steering wheel left and right, the engine rpm should dip a bit then rev back up. If it does anything else, plug that power steering plug in.

You should also definitely fill it up with all fluids before doing any more testing. When starting the engine for the first few times, it will definitely run a bit rough, but if you let it idle for a minute or two it should smooth out. Without a full exhaust on it, it will idle a bit high, but that's no big deal. With the coolant and other fluids topped up, its definitely ok to take it around the block to make sure everything's running right.

As for the OBD port, the Matrix wiring diagram shows a total of 6 wires going to it:

4 CG (Ground)
5 SG (Ground)
7 SIL (Straight to ECM, pin D18)
13 TC (Straight to ECM, pin D20)
15 WFSE (Straight to ECM, pin D19)
16 BAT (Fused 12v signal, 7.5A)

The Prizm/Corolla wiring diagram shows all but TC and WFSE, so just add those and you should be good. Attached is a diagram of the OBD port with the pins numbered. There's a flap type piece piece on the top and bottom that you have to unclick and fold back before you can add pins. I went to a junkyard and got a whole OBD port with wires attached to practice de-pining and re-pining, as well as to have a couple extra pins to add the TC and WFSE wires. Best of luck!

 

[Z3R0_F0UR]

Does anyone know if the celica fuel rail and corolla/prizm rail are different. Car won’t start on it’s own, I have to choke it but it’s not a vacuum leak I have THROUGHLY checked vacuum , the car runs on starting fluid so I’m getting spark I’m 95% sure it’s a fuel issue , the car isn’t throwing any codes besides emissions. I’m thinking it could be my injectors or my ancient fuel pump assembly, I’m gonna start with pump/filter/regulator EVEN though I’ve check fuel pressure I’m getting 44-48psi it drops 5psi while cranking and it will start pressure goes to normal it revs to 3k then shuts off. I have the corolla fuel rail on it right now I can’t remember why but there was something broken on my celica rail I think.
So I’m thinking it’s either injectors or fuel rail.

 

[SC Chinchilla]

Did you cap the secret third port behind the throttle body? I missed this for awhile because of the hoses over top of it, but I also didn't have your symptoms so I kind of doubt that's the issue.

Otherwise, I'm not sure if the injectors are the same 1zz to 2zz but that would cause a big issue.

 

[1998Prizm]

The Prizm fuel injectors are definitely not enough to keep up with the 2zz. You'll have to use the fuel injectors that came with the 2zz. The Celica fuel rail is a bit different iirc. I used my prizm fuel rail with the 2zz injectors and didn't have any fueling issues.

Did you get the TPS wires flipped as well? There may have been a "flood" mode that turns off the injectors when it senses that the gas pedal is floored while you're cranking. If the TPS isn't flipped, it thinks your gas pedal is all the way down, which would activate flood mode.

 

[Z3R0_F0UR]

The Prizm fuel injectors are definitely not enough to keep up with the 2zz. You'll have to use the fuel injectors that came with the 2zz. The Celica fuel rail is a bit different iirc. I used my prizm fuel rail with the 2zz injectors and didn't have any fueling issues.

Did you get the TPS wires flipped as well? There may have been a "flood" mode that turns off the injectors when it senses that the gas pedal is floored while you're cranking. If the TPS isn't flipped, it thinks your gas pedal is all the way down, which would activate flood mode.

Yes I did flip the TPS wires and I’m using the 2zz injectors just with the corolla fuel rail. Just wondering if the old rail would cause a problem but if you had no issue then I guess I need new injectors because that’s the LAST thing that could be giving me problems

Did you cap the secret third port behind the throttle body? I missed this for awhile because of the hoses over top of it, but I also didn't have your symptoms so I kind of doubt that's the issue.
View attachment 416249

Otherwise, I'm not sure if the injectors are the same 1zz to 2zz but that would cause a big issue.

I have a different intake mine looks very different to that and the throttle body isn’t angled but thanks

 

[Z3R0_F0UR]

Yes I did flip the TPS wires and I’m using the 2zz injectors just with the corolla fuel rail. Just wondering if the old rail would cause a problem but if you had no issue then I guess I need new injectors because that’s the LAST thing that could be giving me problems


I have a different intake mine looks very different to that and the throttle body isn’t angled but thanks

Also I replaced the fuel pump , runs better now with a choke but I can’t really put my finger on why it seems better

 

[1998Prizm]

Sounds like you have a Celica intake manifold. That's what I'm running. I don't think you need new injectors, stick with the 2zz injectors/Corolla fuel rail setup. My bet is that it has something to do with your emissions codes, specifically EVAP codes could cause what you're explaining.

 

[Z3R0_F0UR]

Sounds like you have a Celica intake manifold. That's what I'm running. I don't think you need new injectors, stick with the 2zz injectors/Corolla fuel rail setup. My bet is that it has something to do with your emissions codes, specifically EVAP codes could cause what you're explaining.

Yup my engine is out of a 02 celica , I do have evap codes but my reader won’t tell me exactly what , it just flashes “EVAP” at the top of the screen

 

[1998Prizm]

That's weird. Did you put switched (ideally fused) 12v to the igsw wire?

 

[Z3R0_F0UR]

That's weird. Did you put switched (ideally fused) 12v to the igsw wire?

Yes i do. I have access to AllData and I have the shop manuals for my prizm and I wanted to know why it needed that , turns out that sends an output through the “MREL” pin of the ECM, which on a 03 matrix XRS (my ecu model) runs to the EFI relay and powers up a bunch of stuff like the fuel pump etc , on my prizm the EFI relay is powered by ignition power so when the key is turned on that turns stuff on , like the fuel pump so I didn’t even need the IGSW unless it serves another purpose but I do have it connected through a fuse tap from Ignition I just don’t have MREL connected to anything