Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Apple extended hardware test error codes & unexpected shutdown


As you can see from the description above I have unexpected shutdown issues, I ran the Apple extended hardware test and got the following two codes:

4SNS/1/40000000: TOOP and

4MOT/1/40000002: ODD

I did some online sleuthing and all I could find out was that the first error code above relates to a system temperature sensor for the optical drive, does this mean that the optical drive temperature sensor needs to be replaced?

As for the second error code all I could come up with is that it relates to a fan, possibly the optical drive fan, but I could be wrong.

I am guessing that these two error codes may be the reasons for the unexpected shutdowns.

Any suggestions, help and solutions will be greatly appreciated.



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Yes they are the reason for the shut down the first part of the error 4SNS means "check main logic board sensor" and location 1/40000000:T00P is the optical drive sensor. It might be the cable or the sensor. Disconnecting the sensor should allow the unit to run with the fan at full speed, and you might have been able to use a 3rd party fan app to lower that speed. BUT the second error says that fan is not working! Again it might be the fan or the cable. BTW my information is from a 2008 guide but I can't see why it wouldn't still apply.

So good news, cheap fix, replace the fan and cable (I think the fan includes the cable). Bad news=blown logic board or connector to the fan. You decide if its worth the time and money to fix, or just part the machine out.

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Thank you, now I know what to do, I will take it apart, blow out the fan, check all the connections, run the extended hardware test again and see what happens, if it doesn't work I will order new parts and hopefully that will be that, I will post the results.

Thanks again,


OK, so I blew out all the dust from the fans, put it all back together and haven't had an unexpected shut down since, however the DVD fan still registered as bad on the extended hardware test and fan control showed that this fan went on-off-on-off. I finally replaced that fan, I just got done doing it, although I haven't run the hardware test fan control is showing the fan running fine at a steady clip. Does anyone know what the ideal speed for each of the three fans should be?



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