Trying to figure out the best way to change the fluid in a torque converter

P0741 MITSUBISHI - Torque Converter Clutch System Malfunctionhttp://engine-codes.com/p0741_mitsubishi.htmlForum CodePossible causes- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
- Transmission internal mechanical problem

P0740 JEEP - Torque Converter Clutch Circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted

When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

MAKE SURE YOUR ENGINE FINE TUNE. CHECK TRANSMISSION FLUID LEVEL.IF FLUID LEVEL OKAY.DO A FILTER AND TRANSMISSION FLUID CHANGE IF ONE HAS NOT BEEN DONE A LONG LONG TIME.SOUND LIKE TRANSMISSION SLIPPING. IF FLUID + FLUID LEVEL OKAY AND FILTER HAS ALREADY BEEN DONE.YOUR TV SHIFT CABLE LOOSE NEED ADJUSTING. IF YOU SEE A CHECK ENGINE LIGHT FLASHING LOOK FOR TRANSMISSION FAULT CODES LIKE TORQUE CONVERTER CLUTCH SOLENOID OPEN OR FAULTY TORQUE CONVERTER.YOU COULD HAVE FAULTY SHIFT VALVES.BEST GET CAR CODE SCAN.YOU HAVE MANY SHIFT VALVES.

Possible causes - Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
- Transmission internal mechanical problem

SOUND LIKE TRANSMISSION SLIPPING. CHECK TRANSMISSION FLUID LEVEL.IF FLUID LEVEL OKAY BUT FLUID LOOKS DARK SMELL BURNT.CHANGE TRANSMISSION FLUID AND FILTER ADD SOME VALVE BODY TREATMENT TO LOOSEN STICKEN SHIFT VALVES.ADD TO TRANSMISSION FLUID DONT OVER FILL TRANSMISSION WILL CAUSE OVERHEAT. IF TRANSMISSION FLUID GOOD FILTER ALREADY BEEN CHANGED.IF ALL GOOD ENGINE BEEN TUNED UP OTHER POSSIBLE CAUSES FOR TRANSMISSION SLIPPING NOT GOING TO OVER DRIVE COULD BE THROTTLE SHIFT CABLE OUT ADJUSTMENT OR STRETCHED. TORQUE CONVERTER FAULTY OR SHIFT VALVES TO TORQUE CONVERTER OR OVER DRIVE STUCK IN VALVE BODY. VALVE BODY FAULTY. AND HAVE VECHICLE SCANNED FOR FAULTY VECHICLE SPEED SENSOR OR FAULTY THROTTLE CONTROL MODULE OR FAULTY THROTTLE POSITION SENSOR. THEY WILL EFFECT TRANSMISSION SHIFT TO OVER DRIVE IF FAULTY.

Possible torque converter going bad. The torque converter connects the engine to the transmission through the drive shaft.

Also, check that the auto transmission fluid is topped off. Low fluid can cause the symptom described, as the torque converter is filled and works with auto transmission fluid.

Good luck on this repair.

CODE PO741 - TORQUE CONVERTER CLUTCH SYSTEM STUCK OFF WHEN THIS CODE COMES UP YOUR TRANSMISION FLUID TOO LOW OR FLUID + FILTER NEED CHANGING YOU HAVE A RESTRICTION IN TRANSMISSION LINES TO RADIATOR CHECK TO MAKE SURE LINES NOT BENT IN ANY WAY.TCC FEED VALVE OR TCC REGULATOR VALVE IS STUCK OFF DUE TO SEDIMENT OR BINDING.THE OIL PRESSURE SCREEN IS CLOGGED OR DEBRIS IN THE OIL PAN.TAKE CAR TO A TRANSMISSION SHOP GOING TO COST YOU.YOU NEED TRANSMISSION FLUSH AND YOU NEED A FILTER AND FLUID CHANGE.ITS NOT CHEAP FIX BUT YOU CAN CHANGE FLUID + FILTER YOUR SELF TO SEE IF IT HELPS BUT BEST TO HAVE SHOP TO FLUSH OUT TORQUE CONVERTER. PUT NEW TRANSMISSION FLUID IN THE ENTIRE SYSTEM SOUND LIKE OLD FLUID CONTAMINATED WITH SEDIMENT NEED TO GET IT ALL OUT TRANSMISSION.

2.5L engine - 8.4 qts, 3.0L & 3.8L engines – 12.8 qts.

The capacity specifications are if the transmission is totally empty, and here's the clincher for us average types: including the torque converter and radiator tank.

For us average types, even when doing a transmission fluid / filter change, it does not end up with an empty torque converter.

When you pull the transmission pan for the fluid/filter change, you end up with 4-6 quarts on average. The rest is still up inside the torque converter.

Measure what you drained and start with refilling that amount to put back in to return levels back to normal.

Simply use the dipstick to check level and add as is necessary.

NOTE: This is one of the points of distinction to having the transmission "flushed" - where a professional shop is going to hookup specialized equipment to achieve a full fluid exchange, or you do the flush yourself

Assuming that it is tranny fluid, and not engine oil, there is only one seal, and your torque converter goes into it. Anyway, what you're in for is pulling the tranny, no matter what. Then it's pretty simple to pull the torque converter out, and change the seal. You want to make sure it's done right, though. That's an expensive transmission.

the automatic 4R70W calls for 13.9 if equiped with oil cooler 13.2 if not

if you have the auto E40D it calls for 15.9 with cooler 15.2 without and this is 2wd
the E40D with 4wd calls for 16.4 w/cooler 15.5 without.
this is all measured in qts.

if this helped which i know they are right through mitchelondemand throw me some blue ;) take care
erik

if you need transfercase specs just send me a message