No problem the service engine light is on and I am told it reads torque converter

NISSAN D21 OLD.
ENGINE TOLD. 2.4l OR 3 liter. (USA car?)
THE SERVICE MANUAL COVERS ALL THAT.
OLD OLD PU
staged always
cross pattern always
and my book states, 69-76 ft/lbs 2.4 liter
the other 5 engine there , are not the same
so no engine told.
the book TC page says, installed
I recommend in all cases that you buy the service manual real. used.
back in 1990 all are hard bound paper no digital yet and most clones of books are crud. lies and half truths endless. on the web and incomplete.
buy one on ebay used, nothing works better,. used oem books. period.

1. Install the torque converter to the drive plate. When installing the torque converter, be sure to line up the notch in the converter with the projection on the oil pump.
2. Align the marks made during removal and bolt the converter to the drive plate, tightening the bolts to 29-36 ft. lbs. (39-49 Nm) except on the VG30E where the two shortest bolts are tightened to 22-29 ft. lbs. (29-39 Nm).
3. Rotate the engine a few turns to make sure the transmission rotates freely without binding. The engine-to-transmission bolt torque is 29-36 ft. lbs. (39-49 Nm).

MODEL TOLD
NO ENGINE SIZE TOLD AND IS ENG. QUESION
NO COUNTRY TOLD MATTERS FOR ENGINE AND IF TURBO.
if in USA say so, and go here and read them all (torques)
https://eautorepair.net/Marketing/Default.asp

or go to Hyudai dealer and buy the service manual
or google all week, your cash, your down time.

P0740 is the torque converter malfunction code. The converter is in between the engine and transmission. The fluid that you are seeing is transmission fluid. It needs to go to a mechanic to narrow it down from there.

Could be bad torque converter lock up solenoid, bad converter, or bad wiring. Better scan tools will read transmission codes.

If the check engine light came on and the code was torque convertor they did not do you any favor,The torque convertor is the heart of the transmission,the cost as for part is twice your monthly payment.The torque convertor as for honda claims their recommended transmission fluid is not being used and causing torque convertor problem,Recheck the code get the number.

P0743 - Torque Converter Clutch Circuit Electrical
Symptoms - Engine Light ON (or Service Engine Soon Warning Light) Possible causes - Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid
Tech notes This is an electrical problem code. Could be a problem to the harness to the TCC solenoid, the TCC solenoid connector or the TCC solenoid it self.

ask if it has a tcc, or or maybe it's a tss
which is a torque convertor lockup switch
or torque c, sensor switch

The whinning noise from my experance is caused from the filter starting to get pluged in trans. restriction the flow of trans. fluid, its more noticeable when its colder out and oil is thicker. might be a good time to service trans if you havent done it yet. I'am like you i don't know of any torque converter sensor, but if it showed up it must have one, or its something else that kicked that code out, or he read it wrong. I wouldent wory about it, its lasted this long chanses are it will last the life of the car. Did autozone erase the code? If they did When it comes on again have it scaned again and see if it shows the same code, its posible, that code could have been stored in the computer from another time the chk.engine light came on and you did not see it. It only has to come on for a split secound to store a code.

There is one solenoid assy with two solenoids on it. One for the TCC and other for OD. in my experience, P1740 is caused by a couple of things. The torque converters are a subject of trouble for one - I always replace them - the other are the input sealing rings on the input shaft. Older designs leak pressure. Always replace with the plastic - **** end type which is the update today. P1740 has nothing to with the governor solenoid or sensor

Blades inside a torque converter do "open and close" based on engine rpm, and they may not be working correctly. However, they should have given you the error code (DTC) which would tell you exactly what was going on. In any case, if you have a torque converter internal problem, it is almost always necessary to replace it as it does not contain any serviceable parts. If it has been a very long time since the transmission fluid was replaced, I would try that first because if you don't, a serious transmission failure is on the horizon.