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Old October 12th, 2020, 06:57 PM   #1 (permalink)
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Bizarre auto tranny problem 2007 Eclipse

I'll just explain everything and you can straighten me out...
2007 Eclipse 4 cyl auto trans, 215K miles. I'm driving and the car suddenly goes into 3rd gear. D on the dashboard is blinking. I putt putt to my work and turn it off. Later in the day I come out and everything is now fine. Go home 50 miles , no problems. couple days later the same thing happens, check engine light is on. I check the code 0743 “Torque converter clutch solenoid valve system” open or short circuit. I do some quick googling to find out what that means and what I can do to fix it.
I find a list of 5-6 things that will fix this issue. Basically, 2 things I can do without pulling the tranny apart. (which I can't do and probably won't pay for someone to do it because the cost will be more than the value of the car...)
1) so I pull the air box and check electrical connections on the plug to the solenoid's inside the tranny. reseat connector and make sure all the wires are ok.
2) flush the tranny with new fluid. I took it to the express shop by the house to get this done. The mech says looks like the radiator has a leak at the top. There is some fluid on the top of the radiator and on the valve cover. I tell him I'll change the radiator myself.
Here's (finally) the weird part...
The fluid was from the AC cooler/radiator mounted on front of the car radiator. So, my car radiator is good. BUT I noticed that there are NO transmission lines going to the radiator but the radiator I ordered at autozone has pipes on the bottom of the new radiator for the tranny lines. ALL the replacement radiators for 2007 eclipses we looked at in autozone had tranny lines. My car doesn't have tranny cooling apparently??? Is my 2007 just some freak year that didn't have tranny cooling??? I'm lost....
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Old October 12th, 2020, 07:13 PM   #2 (permalink)
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Originally Posted by ChrisJohnston View Post
I'll just explain everything and you can straighten me out...

2007 Eclipse 4 cyl auto trans, 215K miles. I'm driving and the car suddenly goes into 3rd gear. D on the dashboard is blinking. I putt putt to my work and turn it off. Later in the day I come out and everything is now fine. Go home 50 miles , no problems. couple days later the same thing happens, check engine light is on. I check the code 0743 “Torque converter clutch solenoid valve system” open or short circuit. I do some quick googling to find out what that means and what I can do to fix it.

I find a list of 5-6 things that will fix this issue. Basically, 2 things I can do without pulling the tranny apart. (which I can't do and probably won't pay for someone to do it because the cost will be more than the value of the car...)

1) so I pull the air box and check electrical connections on the plug to the solenoid's inside the tranny. reseat connector and make sure all the wires are ok.

2) flush the tranny with new fluid. I took it to the express shop by the house to get this done. The mech says looks like the radiator has a leak at the top. There is some fluid on the top of the radiator and on the valve cover. I tell him I'll change the radiator myself.

Here's (finally) the weird part...

The fluid was from the AC cooler/radiator mounted on front of the car radiator. So, my car radiator is good. BUT I noticed that there are NO transmission lines going to the radiator but the radiator I ordered at autozone has pipes on the bottom of the new radiator for the tranny lines. ALL the replacement radiators for 2007 eclipses we looked at in autozone had tranny lines. My car doesn't have tranny cooling apparently??? Is my 2007 just some freak year that didn't have tranny cooling??? I'm lost....
Those lines are hooked up to this in the picture. Look at the top of your transmission to the left . I would check your radiator cap first. I have the new style radiator with the two line on the bottom.

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Old October 12th, 2020, 07:23 PM   #3 (permalink)
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Thanks Jay allen, I do have one of those that have the tranny lines hooked to it. I think I just freaked out because all the radiators have pipes for trans cooling but I don't have any... PS did you just cap off the lines on yours? (or do you have them hooked up?
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Old October 12th, 2020, 07:27 PM   #4 (permalink)
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Thanks Jay allen, I do have one of those that have the tranny lines hooked to it. I think I just freaked out because all the radiators have pipes for trans cooling but I don't have any... PS did you just cap off the lines on yours? (or do you have them hooked up?
I had them capped off on the radiator until I decided to put a turbo in then I had to take that part out to get the turbo to fit.

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Old October 12th, 2020, 07:38 PM   #5 (permalink)
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The solenoid is inside the transmission, has nothing to do with coolant lines or coolant; if your trans fluid is at the correct level you're good

Please note that there will also be a transmission module code stored along with the generic OBD engine code that will need to be cleared with an advanced scan tool, this has been covered many times, search forum for Autel Diaglink

If your wiring is ok then try erasing all the codes

Honestly you can try erasing all of the codes with that (from trans module too), and if it comes back you're just boned, trans has to be opened up to replace the solenoid, or trans could be replaced although that’s far more expensive, but you or your repair shop might not want to tear the trans open, although to replace the solenoid it’s not too involved I don’t believe past pulling the cover off and the valve body

You can diagnose it here:
https://tearstone.com/eclipsefsm/200...3A.pdf#page243

Last edited by pcfreak4; October 12th, 2020 at 09:52 PM.
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07 eclipse, 2007, box, car, check engine light, clutch, day, eclipse, electrical, engine, fix, gear, good, issue, king, light, problem, problems, shop, short, top, tranny, trans, transmission, work

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