I understand the p0700 just indicates there is a code. My manual (Haynes) says the p0740 indicates 'torque converter clutch, no RPM drop at lockup." The car seems to shift just fine, up and down and runs good. The book says "relationship between engine and vehicle speeds indicated failure of torque converter clutch lock-up system (TCC/PTU solenoid) My scantool says Torque converter clutch solenoid circuit. Freeze frame says it happened at 1632rpm and 40mph. Can I just ignore this code for now? Do you have to pull the transaxle to change this solenoid? I swapped the tcm relay and reseated all the connectors I could get to at the transaxle. Code still their, cleared the code and it came back in about 40 miles. After reseating the connectors on the transaxle, I drove it about 20 miles to see f the code would clear on it's own. It didn't, but figured I'd wait another 20miles or so. Ignoring the code for now, as the car runs fine, but realize I will have to clear the code eventually. I didn't reseat the connector at the TCM because of the work involved. Anybody think that's worth a try?

 

u will need to replace the converter and if u let it go long enough rebuild the transmission

 

Not arguing with you. Just wondering. I have had codes pop up before that cleared after reseating the connector on the indicated component. I'm not a factory trained mechanic, although I was trained to repair UH-1 helicopters back in 1969. (A good year, and I even remember most of it!), and do most of my own work. I know very little about trannys, but know a lot about electronics. Low voltage conditions, such as a bad connection, can cause logic errors, ie: spurious codes. I'm tempted to pick up a TCM at a wrecking yard, and install it just to be sure before I have to take it to a shop. That's a lot less money. I know it could end up being a waste of time and money, but the scotsman in me finds the possibility of putting in the fix on the cheap to be appealing. Think it's worth a try? Or is the torque converter thing cast in stone? I'm a good garage mechanic, but I'm gettin old and lazy and don't want to go through all the hassle of pullin the transaxle to get to the torque converter. That, and you have to pull so much stuff, I get nervous about messin somethin else up. Know what I mean? That's why one of the cardinal rules of troubleshooting is, or should be, "check the last thing worked on." Yeah, I know, I talk too much! That's what happens to old veterans! Wanna hear some war stories?

 

Symptom:
P0740-TORQUE CONVERTER CLUTCH CONTROL CIRCUIT
When Monitored and Set Condition:
P0740-TORQUE CONVERTER CLUTCH CONTROL CIRCUIT
When Monitored: During Electronically Modulated Converter Clutch (EMCC) Operation.
Set Condition: A) Transmission must be in EMCC, with input speed > than 1750 RPM.
TCC/L-R sol achieves the maximum duty cycle & can’t pull engine RPM within 60 RPM of
input speed. B) Transmissions is in FEMCC & engine slips TCC > than 100 RPM for 10
seconds.
POSSIBLE CAUSES
RELATED DTC’S PRESENT
INTERMITTENT OPERATION
INCORRECT FLUID LEVEL
INTERNAL TRANSMISSION PROBLEM - TCC OUT OF RANGE

 

Thanks for takin the time to reply Kevin, appreciate the feedback.

 

How long is "long enough"?

 

all depends on how much stuff the converter is throwing into the system think of it like sand moving around a high pressure system it will start to eat things away.