ECU trans ID pin

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PhyrraM
Fourth Gear
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Joined: Thu Aug 11, 2005 4:34 pm
Location: Lake Elsinore, CA

ECU trans ID pin

Post by PhyrraM »

I seem to remember reading a thread about the wiring diagrams being wrong for some models/years. I couldn't come up with anything in a search however.

In the diagram I am using it shows the ID pin grounded for a manual trans. My auto SS already has this pin grounded. I'm assuming that everything should be good to go when I install my 5-speed as long as I change it opposite of what it was. (cut the wire)

The guides here on LC all refer to cutting the wire and my harness seems to support this. The diagram would seem to be wrong in this case.

Anybody else run across this?
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
'94 FWD and '95 AWD Laguna Blue SVXs.
2017 Pure Red BRZ Limited w/Performance pack
IronMonkeyL255
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Post by IronMonkeyL255 »

Interesting....

My '91 FSM states that the the pin should see 5 volts for both MT and AT for turbo, but be grounded for n/a AT and 5 volts for n/a MT.

I'm gonna have to check to see if mine is grounded or not.......
Disclaimer: If anything I post is inaccurate, please correct me. I do not wish to add to the misinformation floating around on the internet.

That being said, everything I post is accurate to the best of my knowledge.

Rio Red '91 Legacy SS
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Post by AWD_addict »

My '90 had the pin grounded for AT.

Making it opposite what it was is a good idea. Just be sure it's the correct wire and cut it so you can reconnect it if you have to.
90 L+ wgn
PhyrraM
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Joined: Thu Aug 11, 2005 4:34 pm
Location: Lake Elsinore, CA

Post by PhyrraM »

Yeah.

For testing purposes, I will remove the pin from the ECU connector. That way I can just put it back if I need to.
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
'94 FWD and '95 AWD Laguna Blue SVXs.
2017 Pure Red BRZ Limited w/Performance pack
Legacy777
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Post by Legacy777 »

Yeah...the manual is a little screwy.

When the manual states it should have +5v, that means there should be no wire there, or if you have a wire, cut it. Ov means that pin is grounded.

The turbo ECU's from what I have found follow the FSM. The 90 & 91 ECU's I believe follow the FSM as well. The 92 ECU I ran for a while was backwards.

For example. My car came with a 1990 AT ECU. The ID pin was grounded from the factory.

When I did my AWD swap, I kept my 1990 AT ECU, and cut the ID pin wire.

When I put in the 1992 ECU (which is the same for AT & MT) I had to reconnect the wire for the ECU to be identified as a MT ECU.

When I installed the turbo legacy ECU, I'm pretty sure I disconnected the wire again.
Josh

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1990 Legacy (AWD, 6MT, & EJ22T Swap)
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