Wiring diagrams for 96/OBD2

[Huskymaniac]

Can someone point me to known accurate wiring diagrams for my 1996 OBD2 car? I found some supposed 1997 service manuals that came from what appears to be a Russian source but some stuff in there about torque values and wheel bearing parts was not accurate so I don't feel I can trust the wiring diagrams either. I am working on some interesting projects involving the TCU and ECU for us poor OBD2 folks.

[TomsSVX]

What do u need to know?

Tom

[Huskymaniac]

Originally Posted by TomsSVX

What do u need to know?

Tom

I want to know all of the wires going to and from both the TCU and ECU and their color codes.

[TomsSVX]

I can try and look that up on my old mitchel disc. Do you mind if i ask the goal of this?

Tom

[Huskymaniac]

Originally Posted by TomsSVX

I can try and look that up on my old mitchel disc. Do you mind if i ask the goal of this?

Tom

A couple of things.

1. I have built a little electronic module that can be clamped onto the ATF temp sensor line to read that sensor directly. It converts the voltage to a temperature and displays it on an LED readout. I want to make sure I tap into the correct lines for the sensor, ground and power.
2. I would like to start thinking about how one would program a standalone EMS to interface to my TCU.
3. I would like to see if there is a way to fool the TCU into doing things a little differently like lock up the Torque Converter in third gear when the stick is in "3".

[icingdeath88]

http://www.phantomotaku.com/SVX/

Has some service manuals, with some wiring diagrams.

I have also attached some things that may be useful.

http://www.subaru-svx.net/photos/fil...ye95/12431.PDF

[Huskymaniac]

Originally Posted by icingdeath88

http://www.phantomotaku.com/SVX/

Has some service manuals, with some wiring diagrams.

I have also attached some things that may be useful.

http://www.subaru-svx.net/photos/fil...ye95/12431.PDF

Thanks for posting that but I think they are all OBD1, right?

[icingdeath88]

Ah, sry. First link I think still has some 97 stuff.

[TomsSVX]

Obdii tcus are the same as obdi except for barometer in an obdii is external to the ecm. I had a hydra running on an obdii auto. The tcu coded for something that i cannot remember bit it had no effect on performance

Tom

[Huskymaniac]

Originally Posted by TomsSVX

Obdii tcus are the same as obdi except for barometer in an obdii is external to the ecm. I had a hydra running on an obdii auto. The tcu coded for something that i cannot remember bit it had no effect on performance

Tom

When you say they are the same, are you talking about the connector and wire colors or the guts too? I recall Mike saying something about obd2 tcus not being programmable the same way obd1 tcus are.

[TomsSVX]

Im not 100% sure but i remember they take all the same inputs save for can connection to the engine ecu

Tom

[Huskymaniac]

Tom,

Did you ever find the 1996/1997 TCU wiring diagrams? I want to make sure the one I have been using is accurate. If it is, the OBD1 and OBD2 TCUs should be interchangeable, aside from size and fit. It looks like the connectors are the same and the pinouts are the same. I am coming back around to an idea of using a modified OBD1 TCU in an OBD2 car, after figuring out how to shoehorn it in there.

[TomsSVX]

Originally Posted by Huskymaniac

Tom,

Did you ever find the 1996/1997 TCU wiring diagrams? I want to make sure the one I have been using is accurate. If it is, the OBD1 and OBD2 TCUs should be interchangeable, aside from size and fit. It looks like the connectors are the same and the pinouts are the same. I am coming back around to an idea of using a modified OBD1 TCU in an OBD2 car, after figuring out how to shoehorn it in there.

Never found them but what you are suggesting will not work. The obdii tcu talks within the can... obdi does not. You willhave a check engine light on

Tom

[Huskymaniac]

Originally Posted by TomsSVX

Never found them but what you are suggesting will not work. The obdii tcu talks within the can... obdi does not. You willhave a check engine light on

Tom

I have been able to talk to the TCU using SSMI over the SSM pins. Do you know of someone that tried it and had it not work?

[TomsSVX]

Closed area network was mandatory for all obdii vehicles. This way all modules associated with powertrain can talk to eachother... take one out and the engine ecu will cry about it

Tom