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You can tell if your torque converter is unlocked by increasing/decreasing the throttle briefly and seeing if the engine RPMs change a bit without any corresponding change in speed.
The torque converter is a fluid coupling and acts sort of like a partially engaged clutch when not locked. When the torque converter is locked, there is no slipping and the entire drivetrain feels much more responsive. Normal operation (warmed up) for the FRS is for the torque converter to lock after the shift from 1st to 2nd. It only unlocks otherwise when slowing down at low engine speed.
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