Thanks unixdude, I just found that I made a mistake with my cars protocol (that will teach me to look closer!) and don't need to use the ISO interface that I built as the car is J1850 protocol!
Just a word of caution to anyone thinking of buying the 33290 from an ebay seller in Hong Kong (seller id = whymind) The pin1 seems to be on the opposite side of the chip to the Freescale chips - although my interface is untested so I can't verify this!
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