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Message: <blockquote data-quote="Maniak87" data-source="post: 874839" data-attributes="member: 8954">so i was trying to pull codes from my 94 cobra today. the scan tool will not establish connection to the PCM. my check engine light is not coming on but i want to see the codes that are being stored.my radiator fan is running all the time so i am trying to diagnose why. i am also having a weird voltage issue. i now have a new battery and alternator but somtimes when im driving, it will stumble over itself and almost die, check engine will flash quickly then turn off but then the car continues to run like nothing happend. it did it once today on a 35min drive but never did it again an hour later.would a bad ccrm or pcm cause a scan tool not to read? what would cause this?</blockquote>