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...actually, it is because although the ECM "tries" to keep the engine AFR = 14.7:1 for optimum catalytic convertor operation, there are times (warm-up, heavy load, WOT, etc.) that AFR goes richer, and this royally "screws-up" the J1939 presumption that AFR is always 14.7:1, which the Lambda number should correct, but there has never been a calibrated Lambda sensor that I know of.
Last edited by gone-ot; 01-12-2016 at 04:35 PM..
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