Calling all st205 swapers, Need help "Lets get her done!" Options

[lantz2121]

Your favorite, Well I have been in the process of this resto swap for 2 years and i want it done in the next 2 months. I have a 96 st205 engine into a 94 st. I have the 205 harness plugged into the st body harness; It will not turn over tried replacing the st reley nothing. Have you done a 205 to st chassis? I have the harness installed on the engine and the engine is in the car, so i really do not want to take it off. I thought that the same generation engines would be plug and play with some minor wiring. I have a gt ea1 diagram but I can't find one for the 205; i am assuming that the problem is in this plug. I have also assumed that the 205 plugs on the ecu side would be the same as the st on the body side behind the climate control. if youy have any info or another person who has done this swap please let me know. any and all help is greatly appriciated.

I need some help from anyone that has done a st205 engine into an st. If anyone is in the central ohio area I have lots of beer and i know quite a bit, but wiring is my weakest link i need someone to tell me where to start looking thanks lance.

[phattyduck]

I'm assuming you are putting a RHD ST205 motor in tyour LHD '94 ST? There are a fair amount of wiring differences between LHD and RHD in the dash harness area. That may be your problem. Time to start tracing the problem.

When the key is in the 'off' position, does the correct ECU pin get power?
When you turn the key to the 'on' position, do the correct ECU pins get power?
Does the 'STA' signal get to the ECU? Is the fuel pump priming?
When you turn the key, is power getting to the starter?

We don't have enough info from here to actually help you out though - you gotta start trying things and let us know what you found to be wrong so we can help you fix it.

-Charlie

[lantz2121]

I'm assuming you are putting a RHD ST205 motor in tyour LHD '94 ST? There are a fair amount of wiring differences between LHD and RHD in the dash harness area. That may be your problem. Time to start tracing the problem.

When the key is in the 'off' position, does the correct ECU pin get power?
When you turn the key to the 'on' position, do the correct ECU pins get power?
Does the 'STA' signal get to the ECU? Is the fuel pump priming?
When you turn the key, is power getting to the starter?

We don't have enough info from here to actually help you out though - you gotta start trying things and let us know what you found to be wrong so we can help you fix it.

-Charlie

No the ecu pin does not get power; The starter pin is not getting power to the ecu when the key is off or on. There is power at the efi and st reley; but the reley is not getting the signal to close from the ignition. I think that the ignition switch needs some wiring help. From the diagrams I have the starter ecu pin is different from the st205; different plug totally. I don't think the signal is getting to the ecu and the fuel pump is not priming? I really do not want to remove the harness from the engine, but doc tweak said he can wire it for me and the price is fair. Should i just have him wire it and be done with it? I would like to learn and i have a good idea what I am suposed to be doing. The ecu pinouts are different from diagram to diagram. I started looking at the 3 plugs behind the center console and traced them to the ecu plug, but i am having a hard time determining which pins from the st205 harness need to be rewired to match the st .thanks lance

[phattyduck]

You won't find diagrams that match 100% with your car, unless you can read Japanese and know somebody who can get them from a dealer in Japan... I used the diagrams from a Euro ST205 to help me out with my swap. About 6-10 wires don't match up, but they were easy enough to trace.

If you want to do the wiring yourself, get the book for your specific car from a local dealer and then get the ST205 manual you can get on Ebay on CD... and match all the wire up.

You know now its not a plug 'n play swap (it probably is closer to plug 'n play on a GT), so now you have some wiring to do....

-Charlie

[lantz2121]

You won't find diagrams that match 100% with your car, unless you can read Japanese and know somebody who can get them from a dealer in Japan... I used the diagrams from a Euro ST205 to help me out with my swap. About 6-10 wires don't match up, but they were easy enough to trace.

If you want to do the wiring yourself, get the book for your specific car from a local dealer and then get the ST205 manual you can get on Ebay on CD... and match all the wire up.

You know now its not a plug 'n play swap (it probably is closer to plug 'n play on a GT), so now you have some wiring to do....

-Charlie

Charlie,
Did you do an st or gt to 3sgte swap? Also the 6-10 wires you are talking about are they all behind the cliamate control inside or are there also wires that need to be changed at the fuse box conector? I have some diagrams and i have been chasing curicuts; I changed around two pins on the large grey cambed connector "fuse box" and it cranks with the key, but it is in the ign2 position before you turn the key to start. If you could tell me if the wires are just inside the car or if there are also wires that need to be changed at the engine side as well. thanks lance

[Rjb23]

Lance, you shouldn't have to rewire anything under the dash, you may have to rewire the plugs though. When I got my wiring done all I did was send the 2 engine harnesses. Call up Dave, or Dr Tweak they will be able to help you out.

[scothaniel]

Check the clutch / neutral start switch wiring. The ST and GT4 wires are in different places (same connector though). Most of the wires you need to move around are next to the ECU - plugs II1, II2 and IJ1 IIRC.

I have collected a few of the 205 wiring diagrams over the past few years that can help you. If your interested, PM me with your email address and I'll forward them to you.

[phattyduck]

Charlie,
Did you do an st or gt to 3sgte swap? Also the 6-10 wires you are talking about are they all behind the cliamate control inside or are there also wires that need to be changed at the fuse box conector? I have some diagrams and i have been chasing curicuts; I changed around two pins on the large grey cambed connector "fuse box" and it cranks with the key, but it is in the ign2 position before you turn the key to start. If you could tell me if the wires are just inside the car or if there are also wires that need to be changed at the engine side as well. thanks lance

I'm almost done (waiting on an LSD install on the E153 tranny) with an ST205 swap into my '90 Camry... I got a JDM clip and I have Euro diagrams... I figured out every wire before I cut it - though I didn't document any wire I didn't need for my install. None of the wiring on my car was plug-n-play and I haven't looked at a stock ST before, so trust the other guys over me.

The 6-10 wires were all but 1 in the dash/ecu area. The only other extra wire went to the cooling fan relays (light green/black). Others differences were for the EGT switch/dash warning light, Evap canister VSV, and the lack of EGR. Luckily I didn't have any of the homologation rally stuff to figure out!

-Charlie