Question : Switching Shift Solenoid A & B - Results

[Schmieder]

1996 Grand Prix SE 3100 Turbo T04E .50 w/ 4t60-e

I swapped pcm's in my car. The only difference in wiring is the Shift Solenoid A and B control.

In the new PCM, the wires are switched around.

What would happen if I didn't swap the wires? I looked at wiring diagrams and they seem to show they are similar in circuit which would mean it would make no difference.

Can the PCM command Shift Solenoid A as B and visa versa w/o any issues?

Thanks guys

[Weatheralls Auto]

guessing you have a 97 Pcm and referring to ckt 771 and 772?
If you do not switch them the pcm will notknow the correct gear.

you must switch them.

[bszopi]

Depending on the state of the 2 solenoids determines the gear. So if the PCM was controlling the wrong solenoid, you car would go 1st, 3rd, 2nd, 4th.

[Schmieder]

EDIT: I found the colors. link

Now, what are the letters for in that diagram linked above? I am hoping to locate the wires accurately. I prefer zero errors, hehe.

Solenoid A - (A) Light Green - PCM A11
Solenoid B - (B) Yellow/Black - PCM A12

The wires, are they the set of wires running to the trans right near the vacuum line that runs to the trans? I know it seems like a silly question but I like to be sure. All the time I can save, safely, is worth it.

Will a simple cut and swap of those two wires solve the issue? Or are there other wired components in play I need to swap?

Imagine the confusion if I never guessed to check. Going from 1st to 3rd then 2nd. I would have been like, WTF!?!?!?

Thanks guys

[Weatheralls Auto]

Oh Lord, please don't go "tapping" into wires.

Will only cause a mess later on.

You have a wiring diag, then do it correctly.

What are the CKT#s you are referring too?

[Schmieder]

Oh Lord, please don't go "tapping" into wires.

Will only cause a mess later on.

You have a wiring diag, then do it correctly.

What are the CKT#s you are referring too?

96 PCM
Pin CLEAR 11 - circuit 1222 - Shift Sol. A Driver - Transaxle connector A
Pin CLEAR 17 - circuit 1223 - Shift Sol. B Driver - Transaxle connector B

97 PCM
Same as above

I just realized they are the same, so there is no issue now. I have to review my notes now cause I'm sure there was some wiring issues. Putting a 97 Lumina PCM into a 96 GPse.

Give me a sec and I'll see what it was.

[Schmieder]

OOohh

It was....

96 PCM
Pin CLEAR 33 - circuit 225 - Generator Control - error p1663
*** 97 pcm uses pin 35

The other two are the downstream O2 Sensor, signal and low.


The downstream O2 will be disabled through PCM anyways, so that is not a problem.

The only issue remaining is the Generator Control wire.

Lord knows how I mixed up Trans Solenoids with the O2 Sensor 2, lol. Was I drunk when I wrote that file? I have a rule, no drinking when working on my car.

EDIT: Could I just disable the SES code in the PCM or will I have issues with the alternator if I don't relocate the wire? I'm not sure if the wire controls function of the alternator or the like, or is it just a warning light wire that has no effect on engine operation?

I know, wrong forum section now. Accident.

Thanks Guys, this site has been a HUGE help.

[Weatheralls Auto]

Just swap the pin to term 35 right at pcm, will be the easiest or Alt will not function correctly.

[Schmieder]

Just swap the pin to term 35 right at pcm, will be the easiest or Alt will not function correctly.

Ok, I will do that. I was hoping I could leave it be, but no real big deal.

Will those pins pop out and punch back in or do I need to dig up my soldering gun?

Thanks man!

[Weatheralls Auto]

think they are "pull to seat" so you will have to cut and resolder

[Schmieder]

Alright.

Man, the time I put into this turbo project is extensive. It's turning into a full time hobby plus some. I'm going to be at a loss for something to do when it's done. Maybe I'll shift my focus to tuning and master that for a while.

Again, thanks guys. When all is done, I'll atleast have a good video to show off the car, no cheesy background music.

I will also donate to the website. I wasn't going to say until then but it doesn't matter. For all the help I received here, I feel like I owe it, but in a good way.

Time to crash for the night. Dreaming of driving it wot, lol.

[Schmieder]

Well, today is an interesting day.

Upon examining my PCM connectors, I found the red wire I needed to switch from CLR 33 to CLR 35 (red wire, generator control) was already in teh 35 pin.

So I decided to check the rest to be sure all is good. Apparently, I have a wire set up for a 97 pcm in a 96 grand prix?!?! Even the NBo2s bank 2 was wired correctly.

Checked, doubled checked and it's official.

Now I am really curious as the original PCM I have may not be the factory PCM.

When I bought the car, I was told it was built up for performance. Though, the camshaft is stock, but that is ok cause stock cams are good for turbos.

Now, how can I tell if the pistons are forged or stock? Mine are dished and have a series of rings merged together. Are those stock pistons? Cause if they are forged, well, I'll be a lucky SOAB!!! Boost city baby!

What a nice surprise this was today. No soldering needed, lol.

[IsaacHayes]

You should have just got a 97 venture PCM as that's a direct known drop in.

Built up for performance.... Uhm, unless the previous owner told you what that meant it probably means different muffler and a cone filter... LMAO

[Schmieder]

You should have just got a 97 venture PCM as that's a direct known drop in.

Built up for performance.... Uhm, unless the previous owner told you what that meant it probably means different muffler and a cone filter... LMAO

I hear ya, duct tape special cold air filter, lol. Nah, the previous owner was good with cars. He didn't do a lot of porting on the heads but he did gasket match and smoothed the short side curve in the intake pocket. Changed the oil often. He knew his stuff well. But I lost touch with the guy over the years, can't find his number to ask what all he did to the car.

But for some reason the heads were warped a little bit and I suspected a crack in the heads. So, I bought remaned heads. No questioning and no ifs to worry about. Besides, the porting is nice but I'de rather have fresh heads with a turbo install.

All I have left is a few vacuum hoses, waiting on an oil feed flange (replacement) and bolt up the batt.

Then I'm going to drive it to my clean garage and jack the sucker up on stands so I can finish the exhaust work. Running new 2.5" w/ mandrel bends front-back. Test catalytic pipe (for visual inspection, lol), cherry bomb resonator and 2 flowmaster 40's. Should sound real nice with that combination.

Back to work. I'll try to have pics up tomorrow, I forgot my camera today.