can you remove factory security system

It is likely an aftermarket alarm system - typically when alarm is active - the engine will not *crank*.. Recommend checking compression - failing timing belt may have jumped drive or driven sprockets resulting in out of time engine - - spark and fuel pressure testing results would not be affected by this - as you stated.. The good news > While the 3.3L V/6 is listed as an interference engine - I have ‘never’ had a problem with internal engine damage caused by a failed timing belt!