2g 98 5 speed ecu in 95 automatic ?

[logans dad]

please go easy on me . I'm 49 and looked, but cant find thread on pin location for this swap. Again trying to put 98 5 speed ecu in 95 automatic and need to know if it will work. I put it in and swapped 1 2 and 3 4 plug wire and it runs but some times idle goes to 3 or 4 thousand rpm. or it dies at idle. I went to vfaq and don't quit understand what pins to move. First will the 5 speed work even if I get the pins in the right spots?
is this the way
1 pin to 15
15 pin to 14
14 pin to 2
2 pin to 1
Is this how I do it so injector cycle will work? Thanks for any help for the old man.

 

[ddavisaf]

the idling problems sounds to me more like a faulty ISC... have you tested it yet? What caused you to replace the ECU in the first place?

 

[logans dad]

With stock eprom that was in the car its fine but guy wanted to trade as he said he will never get a DSMlink and wanted to make some money.

 

[ddavisaf]

I don't recall you having to switch pins, but I'm looking into right now. I'll get back to you in a couple minutes.

 

[ddavisaf]

I can't find anything that I can say yes or no to, so I PM'd steve with the link to this thread. When he gets online he'll see if he can give you a hand.

 

[logans dad]

I cant thank you enough. I'm always afraid to post thinking it will end bad . This is great. I did do searches for 3 hours and just couldn't come up with what I thought was the right thing.

 

[steve]

Guys, I'm afraid that I don't know the answer off the top of my head.
Those pins don't sound right and the 2G diagrams are in the basement so they will have to wait for another commerical before I can look at them.

Steve

 

[logans dad]

Im back and forth . Watching lost, I understand.
So you do think my 98 will work in his automatic ? Its just putting pins in the right spot?

 

[spyder97gs]

Well my personal opinion is that it will not work, due to incorrect gear ratios and will send the tranny into limp mode.

 

[logans dad]

Ok, maybe why I couldnt find anything about it. Well back to looking for another eprom .
Thanks all for the info!!

 

[johnfsmith]

Don't you need to swap injector wires too? Or does that depend on the cas?

 

[daren_p]

According to the post on dsmlink, it shouldn't matter auto to manual, should be a direct swap. The things that are different between the 95 & 98 are the firing which it looks like you have addressed and the CAS is inverted. As far as I know there is no way to switch this unless you have dsmlink? I have dsmlink and am running obviously running a 95 ecu in a 98 with zero problems, just a direct plug in, with CAS inverted selected. I would switch the CAS and see if I would get the symptoms you are describing but my car is in storage for 3 more months

 

[Budget90GST]

I have a 95 eprom ecu on my 98 auto although I don't know what the donor car was (auto or manual) since I bought it used from a vendor. I am however running DSMLINK and I don't recall having to swap pins, just the spark plug wires. The CAS inversion is also hit or miss. I coulld not tell the difference with it on or off. Hope this helps. Goodluck.

 

[gsxtacy]

This is a intresting topic. I recently bought a used 95 Eprom ECU that had been socketed by TMO back in the day.

I installed it after I got my new 6 bolt running on the stock 98 ECU, and when I installed the 95 ECU and the upgraded injectors, I turned the key on and the CE never went off and all the Emissions solenoids started pulsating.

Is the problem my the wiring for the CAS (I wired it up by RRE 97-99 method) do I need that signal invertor it shows on the diagram for 95-96 ECU cars?

I am ready to send the ECU out and get it checked but I want to know I wired the CAS harness right.

Thanks.

 

[ADrewzki]

I didn't think it would make a difference. I thought the only difference that an auto had was a separate TCU or something like that for the tranny. Granted the cas will be different and whatnot...

 

[gotlag]

Hope this helps some, and if I am wrong correct me, but in what way would the ECU in these cars cause a problem when switching auto and manual. They use a TCU as well. They share inputs, yes, but looking at the diagrams and junctions, I can not see where the ECU actually sends any input signals directly to the TCU.

It would mainly appear that swapping the ECU could only possible effect the ignition as stated earlier, and that is a known fix, like swapping to the 1G head, only now reversed.

 

[blackGSX2g]

Well my personal opinion is that it will not work, due to incorrect gear ratios and will send the tranny into limp mode.

In 2g turbo cars, the transmission type does not matter. In automatic equipped cars, all transmission functions are controlled by the TCM.

As stated before, the firing order at the coil pack will need to be reversed as 95-96 cars fire backwards compared to all other 4g63 models.

If you have DSMLink, you do not have to swap any pins. Click Invert CAS and the injector firing order will be correct. If you do not, then you should do the pin swap at the ECU just like you posted.

It is NOT necessary to do this as your car will still run, however I noticed it was easier to start when cold, idled smoother, and just overall ran a bit smoother after doing the swap.

 

[blackGSX2g]

This is a intresting topic. I recently bought a used 95 Eprom ECU that had been socketed by TMO back in the day.

I installed it after I got my new 6 bolt running on the stock 98 ECU, and when I installed the 95 ECU and the upgraded injectors, I turned the key on and the CE never went off and all the Emissions solenoids started pulsating.

Is the problem my the wiring for the CAS (I wired it up by RRE 97-99 method) do I need that signal invertor it shows on the diagram for 95-96 ECU cars?

I am ready to send the ECU out and get it checked but I want to know I wired the CAS harness right.

Thanks.

What was the code for the CEL?

If you wired the CAS by this RRE 97-99 method, then it is the same as using this 95-96 method. I used the second method listed for the 95-96 (same as your 97-99 method), so I did not use the signal inverter. The inverter only changes the injector firing order so you don't have to swap pins at the ECU. As I posted, the 95-96 ECUs run backwards from both 1gs and 2gb cars. Since you now have a 95-96 ECU, you should do the pin swap.

If you wired the harness wrong, it would not run at all. It is basically a hit-or-miss.

 

[logans dad]

Well He was going to send back my 98 ecu but yesterday said it started running ok again and he drove it for 2 hours off and on and it was fine. I told him to drive it today and see if it still worked as he wants it to work so he doesn't have to give me money back that I sent him with the 98 ecu. Still haven't heard from him today but will let this thread know if it keeps running good for him. Its a bummer as My car has been sitting for 2 weeks without ecu . Again thanks all and I will post if it keeps running good for him. I only hope it does as I see the price of Eproms is going up it seems.

 

[logans dad]

He decided to send it back as it started acting up again when idling. When diving he said it was fine but I haven't had my car out in 3 weeks because he kept his ecu until we decided what to do. Again want to thank all of you for the suggestions on this. OLDMAN Vic

 

[gsxtacy]

Just to dig this up from the grave.....

I wired the CAS harness 97-99 config.
I installed a 95 Eprom ECu with custom chip.
Chip had CAS inversion.....Coil pack firing order changed from 4123 TO 2341.

ECU was my problem ^above....I the ECU to Dave Mertz at DSMlink...he fixed it good as new.

Hope it helps someone out there.