Service manual lists all the conditions for TC lockup/unlock, i'll see if i can dig out the page
Ive found with the A341E and a manual switch for the lockup (ie, no ECU control) it will not lockup at all in 1st or 2nd, also the solenoid should not be switched with the full 12vdc as its designed to operate normally via PWM
Changing between 3rd and 4th with it locked up is noticably jerkier but otherwise seems to be fine, however ive never tried it at WOT...
What im not sure of is whether this is different behaviour to the A340E or not
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