Okay so I've tested this and the tachometer does not immediately increase, so I guess this means the TCC is engaging. If that is so then the solenoid pack/block is good.
Also I have read the Transmission code and found a P0741 which I know is a TCC stuck but like I said, it appears to be engaging. Maybe it is starting to slightly slip and I don't know it?
What would be the next logical thing to look at? Wiring?
@Patrick Lao
- P0741 FORD 61,436 Views
Torque Converter Clutch Mechanical System
If the TCC slips after it is commanded to be engaged, the PCM detects that by comparing engine speed to transmission input shaft speed: they should be the same if TCC is OK. Slippage rarely happens due to solenoid trouble. Normally the solenoid works, or doesn't. The solenoid may NOT work due to either mechanical or electrical failure. If electrical failure is detected, usually that is pinpointed by the PCM code.
In your case, it's saying TCC Mechanical System, meaning the solenoid is probably OK, and the problem lies in the clutch itself, or the hydraulics energizing it, which are sent to the TCC by the valve body.
If you drive a manual transmission, you know that failure to disengage the clutch when coming to a standstill kills the engine. Same thing is true with a TCC if it FAILS to disengage. Therefore, if your engine continues to run with transmission in gear, any gear, the TCC is disengaged, as it's supposed to be, when the vehicle stands still.
You seem sure that the OD gear, 5th. gear, is operating properly. Are you aware that if the TCC never engages, you can continue driving that way as long as you like, using a couple of % more fuel? OTOH, if the TCC is partially engaging due to mechanical problems, it will in time generate debris which might wind up in the transmission. This is not too likely, though. Any material heavier than fine metal dust is thrown to the outside of the the inside of the converter housing when spinning, sinks to the bottom when it stops. Only very fine stuff finds it's way into the transmission. The converter has a continuous flow of oil into and out of it, to take away heat. I don't know where it's discharge lies; if it goes directly to the oil pan, the filter would trap it. imp