I think I did something stupid.. . Well I went to my buddies house (also corvette owner). His corvette has been having some problems with his TAC module. So He asked me if he can borrow my TAC module.. I said sure. First we removed the TAC module from my car an connected his. I started my car an I got codes reduce engine and other crap the car sounded horrible like if it needed gas or about to die. So I turn it off an I said to my buddy I guess your TAC module don't work. So he got mine working perfect before removing mine an placed on his corvette. He started his corvette a few seconds an he said o ****! Still does it hopefully I didn't mess up your TAC module. Thinking to my head; **** hopefully he didn't mess it up because then it will be 2 corvettes mess up. So we took my TAC module from his car an put it back to my car (my original one). Connected back an started my car... an it did the same **** reduce engine an codes popping out. I was like ****! Its my daily driver car. So I need help... has anyone had this problem before. It was working fine when we took it off but we put back an it dosent work properly. Do you think his car fried my TAC module?So I drove it the max speed it got up too was 35 pedal wasent working friend lived 10 miles away. His going to buy me a TAC module but its a weekend everyone is close or don't have it on stock. Mine is a convertible 00 an his is a 01 coupe.

 

Sounds like he has a short or other problem causing the module to malfunction. When he swapped out it worked for a short while and then whatever external problem he has it affected your module now. I learned a long time ago not to swap electronic parts, because the problem could be something other than the part that is bad and actually causes the part to go bad.....

like the time a girlfriend of mine was taking computer courses and brought home a floppy disk to show me her work. Shortly after putting it in my computer, the machine started to act funny, this went on to the point where it would no longer work (a matter of minutes). Course I said you might have a virus... SOOOOO to check it I put the disk in another computer (stupid me) and of course the second computer went dead so now I knew I had a virus... Bottom line was to reformat both computers and re-install everything. Of course she came home the next day and told me that the school had no virus detectors and that another student had brought in a disk from home and that is how the virus spread.......

Good luck on clearing up your problem, the good thing is that your friend may have more problems then you have.........

 

Thanxs jimjenk.! Last time. Ill do something like that. Does anyone have a TAC laying around or forsale in the houston area.

 

Not to be a donkey, but, what is the TAC module, and what does it do?
For my future reference.


Thanks.....

 

Throttle Actuation Control Module. Its the control module for the Throttle By Wire System and your Cruise Control System. Its the small black box located in the passengers fender out side of the PCM:

 

I hope this experiement wasn't a "hot swap" i.e. you disconected the battery on both cars before swapping the TAC......

 

I would try resetting the PCM and see what happens.

 

Did you pull your codes and if so, report what they show, clear them, possibly pull the battery cable for like 30 seconds and start all over.

 

Well I don't remember... if we didn't disconnect the battery before we took the TAC module off my car. I disconnected the battery erased the codes and dosent make a difference still does the same. How can I reset the PCM? It was working fine when we removed it. The car turns on but sounds like its going to die or needs gas.

 

You may just need to do an Idle relearn. Try this:

Remove the airfilter and air bridge. Turn the car to ON but,,,,do not start the engine. Have some one depress the accelerator peddle while you watch the Throttle Body Throttle blade. It should follow the peddle open and closed. It will NOT go fully shut as the PCM holds it slightly open (for the last known correct idle position)

Heres the foum idle relearn procedure:

C5 Idle Relearn Procedure
Purpose
This page basically shows you step by step how to do an Idle Relearn. You would want to do this if you have done any intake modifications. If you do not do this, you may have hesitation or other issues.

Tools Required
None.

Do the Job
Follow these procedures EXACTLY or you will have to start from scratch.

Insert key into ignition and turn to the "On" position but, DO NOT START THE ENGINE.
Pop open the engine fuse block box cover and remove the two 10amp fuses from position numbers 16 & 23.
Your DIC will now display "check" messages for ABS, etc...
Turn ignition to the "Off" position.
Re-insert both 10amp fuses for positions 16 & 23.
Start your engine
Allow engine coolant temperature to reach a minimum of 176 degrees F and run at this minimum temperature for at least 5 minutes.
Shut down engine
Let rest for a minimum of 30 seconds.
Restart engine - check for DIC error codes (there should be none).
Drive car for a minimum of 30 miles at varying rpm settings and speeds. PCM will now re-learn and adjust for the new air flow and air temperature at the intake.
This page was last updated on 06/06/01 by Redshift


Bill

 

Hey bill I did the procedures that u gave me. My buddy. Press the gas With ignition on an the throttle blade didn't even open.. also did the idle reset an didn't change anything still does the same. I think my friends vette fried my TAC module.

 

Stupid question.......have you checked fuse #17 in the underhood fuse box?

 

Yes I have checked fused 17 an still good.

 

I will dig up the schematic for you

 

Just for grins, check voltage on fuse 17 with the ignition switch ON. It should be that same as battery voltage. The TAC module ground is G-106.

Use a meter and put the positive meter lead on each of the small openings on top of the fuse and negative lead on chassis ground.

If you have to purchase a new one, Gene Culley is your best bet www.gmpartshouse.com

 

So, after you reset the DTC's and restarted, what DTC's came back?

 

On the subject of your buddy,,,,he most likely has a shorted wiring harness or defected Throttle Motor Or Throttle position sensor. Before he plugs another TAC into the circuit,,,I STRONGLY recommend checking EACH component for proper resistance and the engine wiring harness for shorts.

Theres a very common problem that can cause this issue. The engine wiring harness runs down the drivers side of the engine. Where it bends around the metal bracket at the back of the engine, sometimes it rubs thru and shorts to that bracket. Check that area very carefully.



Seen this issue numerous times.

BC

 

Find someone with a Tech2. You'll be able to check throttle position, codes, etc ...


Hopefully, you diconnected the battery before removing the TAC module. When working on the electrical system that is the first thing you should do.

 

WEll today im at work but my buddy is not working today so hopefully he will get the part today. Yeah i think he has a short because his motor was taken out to rebuilt ( blew a piston) and said all this problems started after putting the motor back. He drove it for about a 2 months and problems started to happen;he also thinks is a short.


Bill and all the other members for the help really appreciated.

 

ANother question......members? My buddy has order me a TAC module and im wondering is their anythings i have to do before putting it on. I know I have to disconnect the battery but is their another caution i have to take. Once i connect the new TAC module do i have to do something else like a reset or a tune..?? Dont want to mess up anything.