Code: P0740

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Old 11-21-2008, 05:51 AM
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Code: P0740

So today I went to get a smog check and the guy told me that I Failed because of this code.

What does the Torque Converter Clutch Circuit have anything to do with smog?

Any help from you guys would be great.
Old 11-21-2008, 06:27 AM
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It doesnt but its usually a early indication of trans failure. change the fluid and reset the ECU and see if it stays away. WHat year and how many miles do you have.
Old 11-21-2008, 06:59 AM
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I have an 02' with a little over 34k.

What would be the reason for failing the smog then? Any suggestions?
Old 11-21-2008, 08:41 AM
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Originally Posted by III.II
I have an 02' with a little over 34k.

What would be the reason for failing the smog then? Any suggestions?
DOnt know how your testing works but many places wont pass you if you are throwing any codes whatsoever.

Oh and get your car to the dealer. You will probably get a new free tranny.
Old 11-21-2008, 11:24 AM
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i have the same code on my car. what i did was clear the code drive around the city for 15min, at speeds around 30mph (the code will appear when your in 5th gear cruising, happens to me when im on the high way) go and take the smog test and youll be fine. OR if u have a scanner, pull up the the station clear the code and then take the test. either one works. but now u have a failing trans on your mind.
Old 11-21-2008, 07:28 PM
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Originally Posted by fsttyms1
DOnt know how your testing works but many places wont pass you if you are throwing any codes whatsoever.

Oh and get your car to the dealer. You will probably get a new free tranny.
My car is Salvaged title.
Old 11-21-2008, 07:34 PM
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Originally Posted by Rajca
i have the same code on my car. what i did was clear the code drive around the city for 15min, at speeds around 30mph (the code will appear when your in 5th gear cruising, happens to me when im on the high way) go and take the smog test and youll be fine. OR if u have a scanner, pull up the the station clear the code and then take the test. either one works. but now u have a failing trans on your mind.
Do I have to drive it around for 15 min.? I have friends that have the scanner.
Old 11-21-2008, 08:35 PM
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yes u do, read the back of the letter that says u have to take a smog test. just pull up with your friend and before u get the test clear the codes unplug the scanner and let them smog test your car.
Old 11-21-2008, 10:52 PM
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Sounds good. I'll give it a try. Thanks for the help.
Old 11-22-2008, 11:20 AM
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thats NOT going to work in CA- I know- former tech

the TL has a memory in the code storage that tells the smog machine- NOT ENOUGH DATA to confirm all systems are good if the ecu was recently cleared!!!

There is a special procedure that will retrain the ecu (found it in the 01 TL owner manual online for certain and probably others) https://techinfo.honda.com/rjanisis/...01_OMANUAL.asp
that takes 45 minutes of specific speeds and actions while driving to program the computer- then it will say-- ok to smog check

Otherwise its 2 weeks driving normal after a battery disconnect or other ecu reset

You may want to look for a used trans NOW- or it will pass smog then be parked in the driveway not able to go anywhere
Old 11-22-2008, 11:21 AM
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Ca doesnt care what codes- ANY codes are reason for failure
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