What does Japan do if Haiwaii and Pearl Harbour are overtly prepared in advance? I mean by summer 1941 there are effective radar chain systems and demonstrated effective fighter director SOPs, an effective and large fighter force conducting, five fleet carriers on station at PH (Saratoga, Lexington, Hornet, Yorktown and Enterprise). I don't want to debate the specifics of the above, but am instead seeking that level of US strength that demonstrates to the Japanese that a preemptive strike will not catch American unawares.
If we can achieve the above, how does Japanese alter its war plan?