A Guide for connecting a 1G TT ECU to a 1G/2G NA harness

[Stealthee]

Originally Posted by levani041491

i am getting to that and i have 1996 CALI-spec and it will be same ?? on body it says august 1995 and title says 1996 and i f i get 1G FED ECU can i use in cali-spec?

August of 95 would be a 96. 96 production began in June of 95. Your ECU is going to have 4 connectors.

[Lohnes68]

Originally Posted by Mr.3000

I'm actually not sure about this one. I haven't seen a Stock 3/S ECU in a long time haha. I do remember that the 96+ ECU's didn't seem to be compatible with the 1st Gen's because they had a different number of connectors. I would locate your ECU and find out if you have 3 or 4 ECU connections before proceeding any further. Also, due to the fact that you have a Cali Spec, I would err on the side of safety and go with a Cali ECU.



No, this will not work. 94+ TT ECU's have 4 connections. Your harness only has 3. The only ECU's that are compatible that will allow minimal modification are the 91-93 TT's. Also, make sure you grab a Fed Spec

so there is absolutely no way the TT ecu will work with my NA with turbos?

[Stealthee]

Yes it can. If your NA is a Fed Spec that means it has 3 plug ins and you need a 1G TT ECU.

If your car is Cali Spec it has 4 plug ins and you need a 2g ECU.

[Lohnes68]

Originally Posted by Stealthee

Yes it can. If your NA is a Fed Spec that means it has 3 plug ins and you need a 1G TT ECU.

If your car is Cali Spec it has 4 plug ins and you need a 2g ECU.

Okay, because my car is a fed spec 94, and i just bought a fed spec 94 TT ecu for it, so i guess ill be selling it as soon as i get it!?!

[green-lantern]

looks like it. it's a lot easier to log/tune with the 1st gen ECU anyway.

[Lohnes68]

i appreciate your help fellas!

[Stealthee]

Originally Posted by Lohnes68

Okay, because my car is a fed spec 94, and i just bought a fed spec 94 TT ecu for it, so i guess ill be selling it as soon as i get it!?!

Yessir

[Tool Man]

Just a note, I've been running just the rear O2 from the start and have not had any problems (related to the O2 anyway ) No CEL either.

[J-Groove]

Originally Posted by Tool Man

Just a note, I've been running just the rear O2 from the start and have not had any problems (related to the O2 anyway ) No CEL either.

That is pretty bad ass. If that is true that could save many people quite a bit of wiring.

When my front O2 was wired up wrong I was throwing a CEL, but that could have been because the ECU knew one was there just that it was not getting a signal.

-John

[jackhammer]

Originally Posted by J-Groove

My ecu is on a need to know basis. Its better that way

-John

Fixed