Apple Diagnostic Error Messages for MacBooks

A while ago I encountered a MacBook that was prone to random crashes. The log files listed some weird I/O problems in relation to the SMC chip so I decided to take out the battery. This did resolve the issue. To confirm my suspections I ran the Apple supplied diagnostics CD and got the following error message

4SNS/1/40000000:TBOT

After some testing this turns out to be a temperature sensor that is actually embedded in the battery itself. Not having the battery inserted resulted in this error, with the battery everything seems to test OK so I still don’t know whether the battery is indeed at fault or something else is troubling the MacBook.

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