The immobiliser will be interesting too.
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I've got detailed wiring diagrams and system documentation for Toyotas of the same era with TVSS but not the MR2.
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There is a belief that on cars with the later immobiliser
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(ECU ends 550 or higher) that the ignition key is paired with the ECU.
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I've seen this in a number of threads on this forum for example.
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However other TVSS cars have an immobiliser ECU somewhere in the car which is the part paired with the key.
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The inductive ring in the ignition barrel picks up the transponder in the key and transmits that via a signal amplifier to the immobiliser ECU and if the immobiliser ECU is happy with it it sends a continuous pulse signal to the ECU to say
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"all is good, continue running".
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Take the key away, signal stops, engine stops.
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I know the TVSS MR2s have an immobiliser ECU so I suspect they work exactly the same way and that the ECU is not tied to the ignition key at all.
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We shall see
![Very Happy :D](./images/smilies/icon_biggrin.gif)