And what do you mean with system logs? output and error log of console_logs? If yes, then you are unlucky, these should be the first place to check for deeper crashes...
Anyhow, on SP2 the console logs [...]output.log and [...]error.log are to be found under \usr\sap\[...]\j2ee\j2ee_[...]\cluster\server\managers\console_logs.
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