The engine load and air flow rate will cover some of those. Driving at a steady state (cruise control?) and turning on/off A/C and up/down with the windows on a straight stretch should measure changes. RE the DLC 7 pins, the data stream from the Local Area Network (LAN) is only 2 wires, add B+ and ground=4 wires. Haven't looked at what is on the others recently, but I'll let you know tomorrow from work. I may also be able to find out how fast the data is 'streamed', so you can compare against the report rate of the data logger.
Quote{have felt deceleration when coasting down inclines in my 5 speed, and have often wondered if the PCM was sending data to the ABS controllers to keep all wheels turning the same RPM; which keeps the seed very close to that measured when you start to coast. Again, this is speculation, based on what I have felt.} end quote.
The ABS reports wheel speed, but I doubt the vehicle "maintains speed" while coasting. Most manufacturers use decel (high vacuum, low MAP) to cut fuel delivery, helping MPG averages and emissions. I just wondered if the fuel trim would show A. true zero, B. a slight amount of fuel(less than idle) or C. about the same as idle, to keep the engine smooth and feed the cat enough to keep hot.
__________________
2004 Dark Plum Base with windows tinted, cabin filter, silencers removed, fog lights, 18\'s, all Red taillights, Blaine\'s struts, modesty cover, color-matched center dash, 06 rear bumper
|