TCC Circuit Malfunction???? - JeepForum.com

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post #1 of 18 Old 10-02-2004, 05:06 PM Thread Starter
Mudder69
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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!
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post #2 of 18 Old 10-02-2004, 11:49 PM
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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
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post #3 of 18 Old 10-03-2004, 09:09 AM
StealthTJ
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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

Base - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
Suspension- 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
Misc - Tera 2wd lo.
Tires - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
Recovery - Warn XD9000i
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post #4 of 18 Old 10-03-2004, 09:15 AM Thread Starter
Mudder69
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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!
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post #5 of 18 Old 10-03-2004, 09:18 AM Thread Starter
Mudder69
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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!
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post #6 of 18 Old 10-03-2004, 10:55 AM
ncb76
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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
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post #7 of 18 Old 10-03-2004, 11:07 AM
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[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

Base - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
Suspension- 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
Misc - Tera 2wd lo.
Tires - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
Recovery - Warn XD9000i
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post #8 of 18 Old 10-03-2004, 11:16 AM
igofshn
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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
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post #9 of 18 Old 10-03-2004, 05:23 PM
ncb76
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[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
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post #10 of 18 Old 10-03-2004, 05:30 PM
StealthTJ
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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

Base - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
Suspension- 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
Misc - Tera 2wd lo.
Tires - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
Recovery - Warn XD9000i
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post #11 of 18 Old 10-03-2004, 06:34 PM
ncb76
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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
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post #12 of 18 Old 10-03-2004, 09:05 PM
StealthTJ
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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

Base - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
Suspension- 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
Misc - Tera 2wd lo.
Tires - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
Recovery - Warn XD9000i
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post #13 of 18 Old 10-03-2004, 10:20 PM
ncb76
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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
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post #14 of 18 Old 10-30-2004, 08:41 AM
Siebster
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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.
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post #15 of 18 Old 10-30-2004, 10:28 AM
StealthTJ
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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

Base - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
Suspension- 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
Misc - Tera 2wd lo.
Tires - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
Recovery - Warn XD9000i
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