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Master warning light

Hi guys,
i have 1993 JZA80 supra and the master warning light turns on sometimes and ill have to either disconnect the battery or the EFI fuse.
i have tried doing the DIAGNOSTIC TROUBLE CODE CHECK but no codes were shown.
i have topped the break and engine oil.
but still comes up
any ideas what does that means ?

This was in the moderation queue as it was posted in the FAQ section. Moved to the MKIV discussion forum.

Quote:

Originally Posted by supra1993 (Post 105407)

Is your Mkiv Supra a TT?

If you don't mind me asking, are you sure you did the diagnostic check correctly? Ime, every time I've seen the red triangle with the exclamation mark, I've been able to read a code..

Codes come up for a large variety of reasons. Anything from a vacuum leak to a bad sensor could be causing it. We really need the code to do the troubleshooting...