On the circuit diagram they're labelled E-CANH on pin 15 of ECM to pin 6 of ISV, and E-CANL on pin 16 of ECM to pin 1 of ISV
On the ECM connector No 1 (96P) pinout, pin 15 is called E-CANH CAN communication signal high, and pin 16 is called E-CANL CAN communication signal low.
So presumably the ECM sends a command to the ISV to alter the throttle body by a certain percentage, and the ISV responds that it has done so, or a fault message. I'd expect there to be a processor in there, and a stepper-motor, and possibly a feedback sensor to the processor, though I doubt if the latter would add anything to the operation of a stepper-motor.