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I Don't know specifically for SR's but I'd think that the ecu gets power not directly from the battery but through the relays that switch it on and off when you turn the ignition on / off
although the ecu should have a costant power for ecu memory, but I don't know if that would actually run the ecu.. maybe.
I know my mazda will use the constant "memory" power as a back up if it gets no power anywhere else. but that's a 2011 car lol.
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