24? advanced?! In what way did it fail? NOx? Did you remember the diagnostic jumper before testing the timing?
http://www.cygnusx1.net/Supra/Librar...ction=FI&P=118
You should read through the diagnostics for the full system:
http://www.cygnusx1.net/Supra/Librar....aspx?S=EC&P=1
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