TCC Circuit Malfunction???? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > TCC Circuit Malfunction????

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineOld Man Emu WK Lift - Black Friday Special!!The Original 3/8" Ruffstuff Diff Cover!

Reply
Unread 10-02-2004, 06:06 PM   #1
Mudder69
Registered User
 
Join Date: Mar 2003
Location: west palm FLA
Posts: 52
TCC Circuit Malfunction????

I need some help here. My check engine light has been on now for 3 weeks. The Jeeps driving fine, it's a 2001 TJ sport 3peed auto. I took it by advance auto parts today and had a diag run on it. They were able to pull a P0740 - TCC Circuit Malfuntion off the ecm. What the heck is this and what can I do fix this? The guys at advance didn't have a clue.

thanks!

__________________
RED '01 TJ Sport 4.0ltr, 32's with a 2.5 inch lift...JKS Discos for the rough stuff!
Mudder69 is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 12:49 AM   #2
ncb76
Registered User
1997 TJ Wrangler 
 
Join Date: Sep 2003
Location: somewhere outside of Pittsburgh, PA
Posts: 2,064
Quote:
Originally Posted by Mudder69
I need some help here. My check engine light has been on now for 3 weeks. The Jeeps driving fine, it's a 2001 TJ sport 3peed auto. I took it by advance auto parts today and had a diag run on it. They were able to pull a P0740 - TCC Circuit Malfuntion off the ecm. What the heck is this and what can I do fix this? The guys at advance didn't have a clue.

thanks!

This is from the FSM:

P0740 (M)

Torq Con Clu, No RPM Drop at
Lockup

Relationship between engine and vehicle speeds
indicated failure of torque convertor clutch lock-up system
(TCC/PTU solenoid)


I'd ask here about symptoms of a bad Torque Converter.
__________________
"Let Freedom, Friendship, Faith thy Soul Engage,
And serve, like them, thy country and thy age."


'97 TJ Sport | 2" Spacer Lift | JKS Disconnects | RS 5000's | 32x11.5 ProComp MT's on MT Classic II's
ncb76 is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 10:09 AM   #3
StealthTJ
Registered User
 
Join Date: Dec 2003
Location: Tucson, AZ
Posts: 1,774
Quote:
Originally Posted by Mudder69
I need some help here. My check engine light has been on now for 3 weeks. The Jeeps driving fine, it's a 2001 TJ sport 3peed auto. I took it by advance auto parts today and had a diag run on it. They were able to pull a P0740 - TCC Circuit Malfuntion off the ecm. What the heck is this and what can I do fix this? The guys at advance didn't have a clue.

thanks!

It's one (or more)of, probably, three things:
- Bad torque converter (blew the lockup clutch)
- Bad lockup solenoid
- Bad wiring from the PCM to the lockup solenoid
- Very remote possibility, but possible none the less -> Bad PCM.


You *MUST* fix this before driving on the freeway, or at freeway speeds, as you can burn up your transmssion by driving at freeway speeds without the toque converter locked up.

- Oh, forgot, could be the speed sensor also, but that's a little doubtful.

If it turns out to be a bad torque converter (blown lockup clutch), the transmission will have to be taken apart and checked, as, more than likely, lockup clutch material would have made it into the tranny,

I'ld start with the wiring itself. Check to make sure that it looks ok at the electronic solenoid itself.



Fred
__________________
[b]Base[/b] - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
[b]Suspension[/b]- 4.0" Procomp Springs + 1 1/4" bl. Rear tri-link. Currie J arms, F&R. Warn hubs with WJ knuckles, custom cross over/hi-steering setup, Currie A/R Sway Bar.
HPD30/D44 (rear disk conversion, WJ dual piston caliber conversion in the front); Detroits; 4.56
[b]Misc[/b] - Tera 2wd lo.
[b]Tires[/b] - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
[b]Recovery[/b] - Warn XD9000i
StealthTJ is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 10:15 AM   #4
Mudder69
Registered User
 
Join Date: Mar 2003
Location: west palm FLA
Posts: 52
symptoms of a bad Torque Converter



OK, thanks ncb76 for the FSM quote. Has anyone had this fail on their Jeep before and what was done to correct this? I unplugged my neg. battery terminal for 5 minutes to reset the ecm, so far the check engine light hasn't come back but I'm worried that my upcoming 1K mile round trip might leave me stranded on the side of the road.
Any help is greatly appreciated.
__________________
RED '01 TJ Sport 4.0ltr, 32's with a 2.5 inch lift...JKS Discos for the rough stuff!
Mudder69 is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 10:18 AM   #5
Mudder69
Registered User
 
Join Date: Mar 2003
Location: west palm FLA
Posts: 52
Thank you Fred!! It may be my TruSpeed calibrator going ape *****! I'll check the wiring this afternoon.

Thanks for your help!
__________________
RED '01 TJ Sport 4.0ltr, 32's with a 2.5 inch lift...JKS Discos for the rough stuff!
Mudder69 is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 11:55 AM   #6
ncb76
Registered User
1997 TJ Wrangler 
 
Join Date: Sep 2003
Location: somewhere outside of Pittsburgh, PA
Posts: 2,064
Quote:
Originally Posted by Mudder69
Thank you Fred!! It may be my TruSpeed calibrator going ape *****! I'll check the wiring this afternoon.

Thanks for your help!
Here are other codes related to the Torque Converter:

P0743 (M) Torque Converter Clutch Solenoid/

Trans Relay Circuits

An open or shorted condition detected in the torque
converter clutch (part throttle unlock) solenoid control
circuit. Shift solenoid C electrical fault - Aisin transmission


P0743 (M) Torque Converter Clutch Solenoid/

Trans Relay Circuits

An open or shorted condition detected in the torque
converter part throttle unlock solenoid control circuit (3 or
4-speed auto. trans. only).


Maybe that will help you narrow down the problem. Hopefully it's an easy fix. Good luck!
__________________
"Let Freedom, Friendship, Faith thy Soul Engage,
And serve, like them, thy country and thy age."


'97 TJ Sport | 2" Spacer Lift | JKS Disconnects | RS 5000's | 32x11.5 ProComp MT's on MT Classic II's
ncb76 is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 12:07 PM   #7
StealthTJ
Registered User
 
Join Date: Dec 2003
Location: Tucson, AZ
Posts: 1,774
[QUOTE=ncb76]Here are other codes related to the Torque Converter:

P0743 (M) Torque Converter Clutch Solenoid/

Trans Relay Circuits

An open or shorted condition detected in the torque
converter clutch (part throttle unlock) solenoid control
circuit. Shift solenoid C electrical fault - Aisin transmission


[quote]

Actually, he'll never get this code. It doesn't apply to the tranny that's in that Jeep.





Fred
__________________
[b]Base[/b] - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
[b]Suspension[/b]- 4.0" Procomp Springs + 1 1/4" bl. Rear tri-link. Currie J arms, F&R. Warn hubs with WJ knuckles, custom cross over/hi-steering setup, Currie A/R Sway Bar.
HPD30/D44 (rear disk conversion, WJ dual piston caliber conversion in the front); Detroits; 4.56
[b]Misc[/b] - Tera 2wd lo.
[b]Tires[/b] - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
[b]Recovery[/b] - Warn XD9000i
StealthTJ is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 12:16 PM   #8
igofshn
Locked @ both ends
 
igofshn's Avatar
 
Join Date: Oct 2001
Location: Lemoore, CA
Posts: 7,775
tru speed could be the problem. Just replace the sleedo gear in the tcase. about $10 and 5 minutes. Get rid of the tru speed.
__________________
2007, 4 door, powered by a minivan engine, locked and riding on 35's.


[Jeep Pics
igofshn is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 06:23 PM   #9
ncb76
Registered User
1997 TJ Wrangler 
 
Join Date: Sep 2003
Location: somewhere outside of Pittsburgh, PA
Posts: 2,064
[QUOTE=StealthTJ]
Quote:
Originally Posted by ncb76
Here are other codes related to the Torque Converter:

P0743 (M) Torque Converter Clutch Solenoid/

Trans Relay Circuits

An open or shorted condition detected in the torque
converter clutch (part throttle unlock) solenoid control
circuit. Shift solenoid C electrical fault - Aisin transmission



Actually, he'll never get this code. It doesn't apply to the tranny that's in that Jeep.


Fred

I didn't recognise the transmission, but I though I would post it anyway. It's the same for either, though.
__________________
"Let Freedom, Friendship, Faith thy Soul Engage,
And serve, like them, thy country and thy age."


'97 TJ Sport | 2" Spacer Lift | JKS Disconnects | RS 5000's | 32x11.5 ProComp MT's on MT Classic II's
ncb76 is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 06:30 PM   #10
StealthTJ
Registered User
 
Join Date: Dec 2003
Location: Tucson, AZ
Posts: 1,774
Quote:
Originally Posted by ncb76
I didn't recognise the transmission, but I though I would post it anyway. It's the same for either, though.

That's for the Toyota tranny, used in XJ's.
I presume that you didn't find that code listed in the '01 FSM.




Fred
__________________
[b]Base[/b] - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
[b]Suspension[/b]- 4.0" Procomp Springs + 1 1/4" bl. Rear tri-link. Currie J arms, F&R. Warn hubs with WJ knuckles, custom cross over/hi-steering setup, Currie A/R Sway Bar.
HPD30/D44 (rear disk conversion, WJ dual piston caliber conversion in the front); Detroits; 4.56
[b]Misc[/b] - Tera 2wd lo.
[b]Tires[/b] - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
[b]Recovery[/b] - Warn XD9000i
StealthTJ is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 07:34 PM   #11
ncb76
Registered User
1997 TJ Wrangler 
 
Join Date: Sep 2003
Location: somewhere outside of Pittsburgh, PA
Posts: 2,064
Quote:
Originally Posted by StealthTJ
That's for the Toyota tranny, used in XJ's.
I presume that you didn't find that code listed in the '01 FSM.




Fred

Actually it was. I don't know if their codes are the same for all of their vehicles, but they may be? There are some dealing with compressed natural gas and turbochargers?
__________________
"Let Freedom, Friendship, Faith thy Soul Engage,
And serve, like them, thy country and thy age."


'97 TJ Sport | 2" Spacer Lift | JKS Disconnects | RS 5000's | 32x11.5 ProComp MT's on MT Classic II's
ncb76 is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 10:05 PM   #12
StealthTJ
Registered User
 
Join Date: Dec 2003
Location: Tucson, AZ
Posts: 1,774
Quote:
Originally Posted by ncb76
Actually it was. I don't know if their codes are the same for all of their vehicles, but they may be? There are some dealing with compressed natural gas and turbochargers?
No, the codes aren't the same, especially the tranny codes.
The Toyota tranny (the AW4 as DC calls it), is *vastly* different than the 3 speed that we're talking about here. The AW4 is an electronically controlled tranny, the TF999 (the 3 speed we're talking about), isn't.





Fred
__________________
[b]Base[/b] - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
[b]Suspension[/b]- 4.0" Procomp Springs + 1 1/4" bl. Rear tri-link. Currie J arms, F&R. Warn hubs with WJ knuckles, custom cross over/hi-steering setup, Currie A/R Sway Bar.
HPD30/D44 (rear disk conversion, WJ dual piston caliber conversion in the front); Detroits; 4.56
[b]Misc[/b] - Tera 2wd lo.
[b]Tires[/b] - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
[b]Recovery[/b] - Warn XD9000i
StealthTJ is offline   Reply With Quote Quick reply to this message
Unread 10-03-2004, 11:20 PM   #13
ncb76
Registered User
1997 TJ Wrangler 
 
Join Date: Sep 2003
Location: somewhere outside of Pittsburgh, PA
Posts: 2,064
Quote:
Originally Posted by StealthTJ
No, the codes aren't the same, especially the tranny codes.
The Toyota tranny (the AW4 as DC calls it), is *vastly* different than the 3 speed that we're talking about here. The AW4 is an electronically controlled tranny, the TF999 (the 3 speed we're talking about), isn't.





Fred

Maybe they are for foreign vehicles? I've never seen a Jeep that runs on natural gas or one that is turbocharged, as least not from the factory? I'm not sure why those codes are listed.
__________________
"Let Freedom, Friendship, Faith thy Soul Engage,
And serve, like them, thy country and thy age."


'97 TJ Sport | 2" Spacer Lift | JKS Disconnects | RS 5000's | 32x11.5 ProComp MT's on MT Classic II's
ncb76 is offline   Reply With Quote Quick reply to this message
Unread 10-30-2004, 09:41 AM   #14
Siebster
Registered User
 
Join Date: Oct 2004
Posts: 11
lockup solenoid

Is there a way to test the lockup solenoid? When I put 12v on there is no response. I cant here a relais.
Siebster is offline   Reply With Quote Quick reply to this message
Unread 10-30-2004, 11:28 AM   #15
StealthTJ
Registered User
 
Join Date: Dec 2003
Location: Tucson, AZ
Posts: 1,774
Quote:
Originally Posted by Siebster
Is there a way to test the lockup solenoid? When I put 12v on there is no response. I cant here a relais.
How are you putting 12v to it and how are you checking for a response ?




Fred
__________________
[b]Base[/b] - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
[b]Suspension[/b]- 4.0" Procomp Springs + 1 1/4" bl. Rear tri-link. Currie J arms, F&R. Warn hubs with WJ knuckles, custom cross over/hi-steering setup, Currie A/R Sway Bar.
HPD30/D44 (rear disk conversion, WJ dual piston caliber conversion in the front); Detroits; 4.56
[b]Misc[/b] - Tera 2wd lo.
[b]Tires[/b] - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
[b]Recovery[/b] - Warn XD9000i
StealthTJ is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.