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to get at the ecu(or pcm, as Mazda calls it) you pull the radio head unit. it is behind it. and it is IN there. the hardest part is to disconnect the wire harness's, which are BEHIND it, and really hard to get at. pry off the carpet by the accelerator, and you will see the connectors. it might be easier to pry off the connectors before unbolting the unit. removing it will test your mettle.
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