How to disable a built-in command in vim

A better solution can be:

:cabbrev wq w

But I'm not sure why cmap doesn't work as excepted. Actually I had mapped one my function keys to save files:

:map <F2> :w<CR>
:nmap <F2> <ESC>:w<CR>i

UPDATE: typo corrected in the first command.

UPDATE2: possible workaround:

:cabbrev wq<CR> w

HTH