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That's about as obscure as it gets. Here's what I can give you:
The way the TCC (commonly called a "lock up" converter) works is that the speed sensor tells the fuel computer when the vehicle is moving faster than 40 or 45mph. The fuel computer then tells a solinoid inside the transmission to open or close, which builds pressure inside the torque converter clutch, which causes the torque converter to "Lock". On Ford vehicles, there is nothing electrical beyond the solinoid, so if a torque converter fails you may just get this type of code (the fuel computer knows approximately what RPM the engine should be spinning at with the lock up engaged) Here's where I'm confused:
P07XX is specific to transmission problems and there are at least 90 of these codes that tell you specifically what is wrong with your transmission. If you are missing the 2-3 shift you should have a code set for that. If lock up doesn't engage there's a code for that. You shouldn't be seeing P0740 all by it's lonesome.
Here's what I'd suggest: Check the condition and level of the fluid. Fluid should be "Pink with no stink" and it should be within an 8th of an inch of the top marking on the dipstick. slightly underfull is always better than slightly overfull. Visually inspect all the wires going to the transmission, check for wires that wiggle in the socket and corrosion. Check the speed sensor and it's wiring. Have *SOMEONE ELSE* pull the codes from you computer and ask them to get *ALL* the codes (slow and fast).
Hope that helps! |
RV and bus conversion info since 1996.
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