Hi Nick,
Very easy to locate, right hand side of the engine at the bulk head. Aluminium cover, with a bunch of cables coming out of the side. If the latest ECU has been fitted then there should be a small orange dot sticker on this cover, where the cable exits.
Our +4SS had a total ECU failure at 70miles. Now has the latest orange sticker version but still not 100%. Uses a lot of fuel. Currently at RPM Perth getting sorted.
Cheers,
Matt

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Last edited by Matt999; 14/07/12 10:05 AM. Reason: photo added.