"The ECU takes the following measures to prevent engine damage when the FI, ignition or other system parts have troubles." Found in your generic metric motorcycle manual since 1999, or even earlier if you add Harley's VOES.
Intake air pressure sensor (VOES) ~ Defaults to a method (new math calc as in a single number entered).
02 sensor ~ HAD many signals to control the fuel cut, by how much rich/lean is moving past the 02 sensor. This is called an analog move or the jobber can send in many input signals.
Once the 02 fails, there is no longer many numbers. Only one number is entered. For example, a throttle position sensor has may analog numbers throughout its range. At idle there is only one number coming in. During acceleration, many numbers are inputted so the demand is met equally to the demand of the input.
A WOT, the throttle is pinned open. Again, notice the one number is locked as one. If the throttle is closed at idle, see the concept of one number entering? All other openings bring in a linear number to match rpm, you can't feel the transition hitting full advance.
If the 02 fails, there are no longer many numbers moving from .1v to .9v, or less than a volt: that the 02 works within. Now the single is showing only 1 number throughout the range. The computer bike comes with a backup if a sensor fails or is out of range or no range at all. There is a backup number calculated against rpm. So one number is now used at the 02. The computer recognizes this and defaults to using 1 number (the penultimate number) so the bike is safe to run if you took it to WOT.
The number becomes redundant and since there is no longer an analog signal [many signals] the jobber puts out, the bike codes to a safe-mode. Ignition is so subtle, you can't feel it but HP has dropped off because the analog (many) no longer can compute in a finer fuel feed, so instead, the bike uses a low/mid to mid/hi fuel trim called, 'The Method.'
Since you lost the precision fueling, the computer steps down the fuel/ign into a 'safe for engine' mode so you limp home in that backup ign/fuel setting.
So when you head up a mountain, there is less air, correct? The 02 detects a rich condition and leans out the fuel trim. WATT happens if the 02 fails? Does the computer know how high you are to lean out the bike? No.
Now can you tell the difference it only works off rpm now? Uses the penultimate number over and over?
You've got to be one big frek'inn
you claim 'no difference' and the code says different.
Carlost, when you lost in the woods 'Runner Upper Types' come up against the book, I am just the messenger to show guys like you, you don't know jack :toily: Come time to EXPLAIN IT.
I've got your check engine light....
:urowned:
Stay focused on the OP not me or come get some. :roll::read:
