I had a torque converter lockup clutch that was not disengaging at speed (55mph+) when I let off the accelerator, , i.e., the engine and trans remained locked up and the engine acted as a brake, and stayed engaged until the speed dropped to 33-34mph (when the RPM would drop 500rpm and the engine no longer felt like it was braking but rather coasting).

Started a thread on this issue.

I replaced the lock up solenoid on the valve body -- requiring me to remove the output shaft speed sensor and drop the valve body.

The lockup issue seems to be fixed: the lockup clutch now appears to be releasing at speed when I let off the accelerator (based on an immediate RPM drop and minimal engine "braking"), and not only when the speed drops to 33-34mph).

However, now I have the infamous blinking S+M+D+P0722 issue that I have started to read about (BTW, what is the XYZ switch -- it doesn't show up as that in the RAV).

Car will launch normally in Drive, then appears to be stuck in 1st gear 'til about 30 or so, when it hard shifts up to 4th gear then stays there. The green S and M idiot lights blink and the CEL show a P0722 code. It is drivable, and I have had it up to 70mph in this state, but it's not great launch from a stop light in 4th gear. When I turn the beast off and then on again, it re-sets, but then exhibits the exact same behavior all over again.

My first thought was that I somehow didn't get the output shaft speed sensor seated right relative to the spring steel clip that holds the sensor in-place.

Could I have actually screwed that up (it seemed really straightforward) or am I having a coincidental low bus voltage issue issue?

I am starting a new thread referencing this one to see if anyone has a comprehensive diagnostic approach and solution to the Blinking S+M+D+P0722 issue, as I found bits and bytes in the forum but no one who actually had solved the issue.

Thanks in advance for the help.