It is possible to use the Freescale FRDM-KL43Z to debug another board (see “Using the Freescale Freedom (FRDM-KL43Z) to Debug other Boards“). The FRDM-KL43Z has an on-board debug probe integrated, the OpenSDA. But it is easily possible to debug the board directly with a SWD debug probe like the P&E Universal Multilink or the Segger J-Link.
The only modification of the board is to populate the J11 SWD 2×5 Pin Debug header on the board:
Possible part number for the header: 1667728
Everything else on the board can stay as it is: no other change necessary. Just make sure you power the board (e.g. through the USB connector and make sure you have the 10pin SWD cable matching to pin 1 on SW11:
Happy Debugging 🙂