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Old 10-17-2013, 02:13 AM   #13
Hmmmm, dirt!
StevenD's Avatar
Joined: Aug 2005
Location: Holland, Amserdammed
Oddometer: 1,149
During Initialization the ECU learns:

The sensor values and ranges. All sensors are different, for example the three map sensors, front cyl, rear cyl and atmos, all have different voltages for the same reading. Before the engine is started, they are all reading the same values (atmos pressure), but putting out different voltages. This delta is saved. If you swap these sensors with out doing a reset, the engine tuning will change and may not be correct. This is for the very tight emissions.

Nope, this is not done during the 15 minute thing, this is done every time you cycle the key, while the rpm needle is going up and down.

The TPS sensor changes depending a little on temperature. The idle position of the throttle plates change as the engine breaks in, so the voltage is different. During the 15 min idle 'Initialization' the voltage of the TPS at idle speed is kept.

The tps position / idle stepper position is constantly read and adjusted on the fly, it changed too much to be a fixed stored value. Try it, adjust you tps, bike will start low or high, adjusts in a little while and next time starts spot on (within the small useable band set for idle tps voltage of course)

The home altitude of the bike determines some of these values also. Since KTM can't predict where the bikes are going, they are shipped with the ECU in the 'reset' condition. The KTM tech has to start up each new bike and let is idle to initialize it. If you ship your bike from sea level to a mountain city, it may not run very well for a while. If you reset it and initialize it, then it will run 'good' right away. I guess that's the whole idea behind this.

This is the part where the o2's play a major role. next to the load sensors wich are still used to achieve this when o2's are off.

The ECU writes out this info as the bike runs. The old 07-08 ECU will write every 15 min or so. The new 09-up will write out more often, I've heard every 9 min. If you ride the bike from sea level to the mountains, it will write enough to keep it running good the entire way.

True, this is software in the ecu and not due to hardware changes of the ecu. with the keihin programming tool you would probably be able to set this at about any value you desire.

The O2 sensors read the mixture created under cruse and idle. If they are turned off, then the ECU throws a mixture 'down the hole' and hopefully it is correct. If they are turned on, then it will get some feed back and correct it. The voltage signal for an O2 sensor (narrow band) is essentially high or low, on or off. I don't know if any values for it are kept during initialization.

Yes, these values are stored during initialization getting the idle mix just right for TPS 3% - 1% (about) wich have a lot to do with the 'snatch' off idle, what you mainly experience after a good init run. With o2's on that is.

When KTM was selling Akcro exhausts and providing maps for it, we were supposed to initialize it after install. This map has the O2 sensors off.

With TuneECU available, I can't think of a reason to have the O2 sensors off. Maybe for a full track bike that never idles or cruses. But any street ridden bike it doesn't make sense (or cents).

This is corrected later by leaving the o2 on in the ktm provided akra map's. the first released akra maps had them off, probably because they were easyer to devellop. I too rather leave o2's on on a street. Leave them off for tuning though. After you map is just right, switch them back on.
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