reset E.C.U.? - BMW Luxury Touring Community
 
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post #1 of 3 Old Mar 8th, 2014, 11:22 pm Thread Starter
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reset E.C.U.?

Hi, I was getting poor mpg, so I changed the OČ sensor because it was looking like a prime suspect.
Upon changing the sensor I found that the old one was indeed damaged, it looked like it had taken a pretty good beating. I was fairly excited about the likelihood that the sensor would have fixed my problem. But, then to my surprise after checking the air filter, the plugs, wires, and changing the sensor, and oil I now have a bit of a rough idle. This leads me to my next series of questions:

Does the bike have to cycle several times before the new fuel mapping is adjusted?

If so can the battery be disconnected for long enough to drain relays, and capacitors allowing remapping?

Thank you!
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post #2 of 3 Old Mar 9th, 2014, 6:44 am
cws
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Re: reset E.C.U.?

Maybe try TPS (throttle position sensor) reset procedure?

Switch ON but not started, open/close throttle fully 2-3 times, switch OFF. Then try starting it again and see if improved. Takes a little while to set itself.

Chris
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post #3 of 3 Old Mar 9th, 2014, 10:27 am
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Re: reset E.C.U.?

Quote:
Originally Posted by superstan26 View Post
Hi, I was getting poor mpg, so I changed the OČ sensor because it was looking like a prime suspect.
Upon changing the sensor I found that the old one was indeed damaged, it looked like it had taken a pretty good beating. I was fairly excited about the likelihood that the sensor would have fixed my problem. But, then to my surprise after checking the air filter, the plugs, wires, and changing the sensor, and oil I now have a bit of a rough idle. This leads me to my next series of questions:

Does the bike have to cycle several times before the new fuel mapping is adjusted?

If so can the battery be disconnected for long enough to drain relays, and capacitors allowing remapping?

Thank you!
After resetting the ECU (disconneting of battery or fuse) it takes a while to settle. Not many days though. Based on my experience one good long ride is enough. Coupple of notes: "Rough Idle" is pretty typical for many LTs. Maybe the earlier (too I guess rich) mixture softened that up...? TPS reset (described above) is also something to be done after ECU-reset.

Idle in LT is adjusted by idle actuator (a stepper motor). So any possible idle problems might in some cases be caused by it. Not too likely though.

Born to be wild so why not

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