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open loop VS closed loop ecu modes

Discussion in 'General Tech Articles' started by pissedoffsol, Dec 24, 2002.

  1. pissedoffsol

    pissedoffsol RETIRED

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    Sep 28, 2002
    Retirement Home
    ECU Modes:

    OPEN LOOP - this is the mode your ECU is in until the coolant temperature and a couple other sensors get to operating values. This is also true when you are at WOT or when throwing codes/ CEL's

    CLOSED LOOP - the ecu uses information primarily from the Oxygen Sensor and adjusts fuel delivery and timing to achieve minimum emmisions, better gas mileage and power.

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