Quote:
Originally Posted by jamesqf
That's strange. Admittedly the Insight is not a "normal" car, but the only time I see it going into open loop (other than briefly on a cold start) is when coasting in gear with zero load, or even regen. The MPG bar is always pegged at 150 mpg when this happens (though it can be pegged in closed loop, too), so I always thought it meant the engine was in DFCO. Enrichment with the fuel cut off doesn't make sense, does it? Or is this just Insight weirdness? (It's the only thing I've ever driven with a ScanGauge or similar.)
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In the context of this thread (accelerating) open loop = enrichment.
However, what open loop really means is that the ECU is ignoring the O2 sensor(s). This also happens on engine start and during DFCO events.