What do failing widebands look like in a scanner log?
I'm getting some pretty wide swings on commanded lambda. Mostly when accelerating and decelerating. Otherwise it stays pretty close to stoich.
What do failing widebands look like in a scanner log?
I'm getting some pretty wide swings on commanded lambda. Mostly when accelerating and decelerating. Otherwise it stays pretty close to stoich.
On these new coyotes 2015 plus, they will usually stop reading. They are basically a LSU dyno style sensor 5 wire. You can test them with Scan tool. At Lambda, when the air/fuel mixture is 14.7 to 1 (stochiometric), the current flow through the sensor is zero. If the air/fuel mixture goes rich, the current increases in one direction (negative). If the air/fuel mixture goes lean, the current increases in the opposite direction (positive). A signal may range from a low of around 2 volts (very rich) up to nearly 4 volts (very lean). At Lambda, the voltage signal generated by the PCM should be around 3.3 volts. I attached an image where the wideband O2 sensor was faulty going rich.
Here is a screen shot of what I'm seeing along with a log.
Thanks for any help
DO you have Long term Fuel trims enabled? You short terms your pull up to 5% fuel in some spots and adding up to 2% fuel in other areas, factory 3-5% average standard. Of course this is based on my graph setups. I have Test WB EQ graph, EQ Err graph, and WB EQ B1 +B2 averaged all show swing but their is one area at idle in the graphs adding 16% but in the chart shows wide band EQ 1.00 & equivalence ratio commanded .95/.96, maybe a glitch in the scanner software not sure..Originally Posted by K44
My dash gauge is swinging from about 12 to 16 at certain times. My long terms are on. I noticed this right after a tune flash. The swings are also on my stock tune, so I can rule out a bad tune. Could it be as simple as not giving it enough time to learn?
Watching the dash gauge swing that far is unnerving to say the least.
The upside is I now understand how the dash gauge works. It is tied into the commanded lambda signal. When my dash swings to 16 the scanner shows it as subtracting fuel. So it is commanding 16 to get stoich
have you tried adjusting the HEGO Tip temp, and or the Closed loop forward feed Bias. Do you have Maf adaption & Cylair Anticipation enabled. Have you graphed AFR error?
have you tried adjusting the HEGO Tip temp, and or the Closed loop forward feed Bias
I have not
Do you have Maf adaption & Cylair Anticipation enabled.
Yes
Have you graphed AFR error?
I do not have this channel
Yes, and yes i have
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