did you scan the PCM for DTC errors? first? if not why not?
this toy only works when all else works, so....
if not ,ask the dealer.
when going zero miles per hour there is no MPG.
do the math, ?
distant traveled divided by fuel consumed is.
0 div / fuel rate = 0 see? 0 /1000 is 0,
I made my own tool and it shows 200 for that and 200 for divide by zero. (when you drive and cut throttle the injectors cut fuel so fuel is zero, causing divide zero errors. ( 10 miles / 0 is ( div by zero error)
so i trap both those errors, in my software, with 200 flag , the 200 means, (can not compute MPG) see? or I could use 999.
since i didn't design the jeep PCM , i cant tell you there traps.
its just toy. but is ok cruising, use that when moving,
MPG stopped is 0.
have you tried cut fuel mode yet?
drive fast , cut throttle, hot engine, in gear, and fuel is 0 flow.
try that, and watch what it does, what you see is what you get.
my other car , with full obd2 tools, shows 190 mpg.
and is real.
see that here. buddies, top scan tool live data. and plot.
http://www.fixkick.com/my96-16v/fuel-MAF-VSS.JPG
some cars use injector pulse width (flow) to compute MPG
other use MAF air flow. and reverse compute injector rates, (tricky ask)
does this help?
my 2002 jeep has my home made MPG gauge from scratch.
(Arm processor based)
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