I thought about this when I wrote my post... I initially came to the same conclusion, that there is no GEARING in a 1990s /early 2000s car to turn the steering wheel for you or push the brake/throttle accelerator. But then I thought that: In 1990s and 2000s era automobiles the accelerator pedal inputs are translated electronically. While pushing the accelerator/throttle pedal opens the throttle body via a wire, the car's electrical system still has to adjust the flow and final mixture of gas entering the cylinders through the fuel injectors, based on how far you push the pedal.
So, the T-X COULD accelerate the car WITHOUT pushing the pedal, but she would have to "lie" to the car's electronic control unit system (ECU) to make it THINK the accelerator was being pushed, and the car would move. She could do that remotely.
While we have automobile break-by-wire systems nowadays in some vehicles, they weren't in common use 25 years ago... there was still a direct mechanical linkage between the break pedal and the breaks themselves. So the T-X COULDN'T "break" the car remotely... but she didn't have to! She would just slow the car down by again "lying" to the ECU, telling it that the accelerator/throttle pedal wasn't being depressed, which would reduce the car's speed without needing to apply the breaks (although this would be a sloppy way to do it for sure). And since she was chasing our heroes at full speed through downtown, she wasn't planning on hitting the breaks anyway.
Steering the car without turning the steering wheel/shaft? That's a tough one. Most automobiles of that era had power steering assist to help the driver physically turn the wheel left or right, via a hydraulic pump and rotary valve. But to my knowledge the power steering assembly can't be rigged to "turn" the steering shaft at all; it only helps apply hydraulic force via an analogue valve system to the DIRECTION you are turning to make it easier for you to aim the wheels in the direction you want to go. I guess it's technically possible she could use her nano-technology to create a magnetic field around the metal steering shaft and, by altering the current remotely she could alter the magnetic field to push or pull the shaft to the right or left and therefore steer the car remotely. But that's a W.A.G. at best.
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