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When does the ECU go into open-loop mode for fuel mapping?

April 26, 2017ECU FUEL Mapping mode open-loop

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When does the ECU go into open-loop mode for fuel mapping?

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As far as I can tell, this happens at about 20% and higher of throttle position, which corresponds to about 1.0V from the throttle position sensor (TPS). I have not seen any evidence to show that the ECU looks at any other parameter in determining when to operate at open-loop conditions.