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I don't think it's documented anywhere, but it appears to function this way on Excursions equipped with the GPCM. None of the Super Duty models that use a relay in place of the GPCM do this. In my case, since my ECM was acting up, it made sense to switch to an F250 ECM and harness with the relays. I forget what continued to throw an SES code after the mod, but it was easily suppressed it in a custom tune.
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