Originally Posted by Mickey T
toyota were punished for a very blatant piece of cheating. the FIA knew it was going on by ALL teams, announced at which round they would check it and toyota was the only team that didn't remove their trick.
they engineered (a beautifully engineered thing it was, too) a bypass of the air-inlet restrictor that sat perfectly in position at idle and low rpm, but sprung open at wider throttle openings. unfortunately for them, one of the spanners blipped the throttle while a scrutineer had his head under the bonnet and they caught them.
they got banned because it was a systematic cheat to bypass not only the restrictor, but an FIA rule - and arrogantly refused to remove it even when it knew it would be checked.