R1150GS O2 sensor - dumb question

[Paughco]

Guys: I just got done checking my 2001 R1150GS with the GS-911. The
main reason was to check voltages because I've had a couple cold
starts in which the ABS lights show a malfunction. Restart and she's
good. Will get a new Westco in a week or so.

Anyway, I decided to check the "real-time" function with the engine
running. Yup. Numbers moving before my very eyes. Then I checked
the O2 function. Uh-oh. Flat line. Not the up-down-up-down... that
I see on my K1200S.

Flat line on the 'ol O2 sensor. I'm guessing I need a new one.

Am I wrong?

Seeya
ATB

[brav...@verizon.net]

Lack of signal from the O2 sensor could also be a bad connection
somewhere.

Take a look at the Odessey battery instead of the Westco. Couple of
dollars more, but I think it has a longer life. I have them in my
R11S and K75S now. Great service.

George

[Lloyd Provin Jr]

How long did you run the motor? Oxygen sensors don't generate a signal until they reach a certain temperature.

Lloyd (Bud) Provin, Jr
THE NICKWACKETT GARAGE
802-483-2460


 




 
> Date: Fri, 8 May 2009 20:13:45 -0700
> Subject: [GS-911] R1150GS O2 sensor - dumb question
> From: alan_t...@msn.com
> To: GS-...@googlegroups.com

[Paulo Cesar Salim]

Hello guys,

 

I´m Paulo from Brazil and it is my first colaboration here. I work with fuel injection since 1990, and the system used in GS 1150 is a Bosch Motronic. Most of times that the lambda sensor doesn´t work it is because the system is not good. Maybe:

 

1) Fuel pump ( It not give the right pressure)

2) Heating system of the Lambda Sensor ( The Lambda to work well , needs to be heat.) There are 2 wires that comes 12V. Inside the Lambda sensor there is a resistence. So you need to measure both  the 12 Volts and resistance value.

3) Measure the wires from Sonda to the ECU. When the ECU not recognise the Lambda Sensor (for example the wire is broken) the own system assumes 450 mV ( the midlle) . You said flat-line but I don´t know the signal is ground or around 450 mV.

 

I hope to give some little help about that.

Thanks

 

Paulo Cesar
GS 1200 2007
SBC - SP - Brazil

 

OBS: Sorry about my english, I speak portuguese :)

[Stephan Thiel]

evaluate your O2 sensor graph ONLY once the engine is at operating
temperature... while the engine is not hot it is running at an increased
enrichment, which makes lambda closed control pointless... hence the
controller only starts the closed loop Lambda control as the engine
nears operating temperature... when the closed loop control is off, it
will also be a flatline.... hence the importance to test it only at
operating temp, as you may think it's broken, while in deed it has not
been activated by the control unit yet...

Next version, We'll display the engine temp on the graph too...

best,
Stephan

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Stephan Thiel
www.hexcode.co.za
+27 21 880 1433 (tel)
0 86 614 1109 (fax)
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[nicola...@hotmail.com]

A Zirconia O2 sensor begins to work at 700 deg C. Once the cell
reaches that temperature, The Zirconium is permeable to oxygen. The
difference in oxygen concentration on both sides of the cell ( inside
and outside) makes the electrons moving into the two tiny little wires
conencted on each side of the cell. It then creates a voltage which
is proportional to the concentration of oxygen in the flue gas
compared to a reference (ambiant air at 20.9% O2). Well, I say
proportional but is not exactly true. It is actually a curve but it's
almost linear. Usually, the control system where the probe is
connected to knows that curve and has an algorythm to correct that non-
linearity.

O2 sensors are also widely use in industrial processes as in boilers,
ovens, etc. The main purpose is to control the combustion to achieve
the highest possible efficiency hence as less fuel consuption as
possible.

SO, As long as the probe is cold, it won't give you any signal !!!

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[Paughco]

I installed a new O2 sensor in the R1150GS. Rode her around the
neighborhood until I got five bars of heat and then hooked up the
GS-911 and the wife's laptop. First thing: before I started the
machine, the battery read around 12.7 volts. I started the machine,
and got the same relatively flat line on the real-time O2 sensor
graph. Plus the there was a message that the O2 sensor was "off" in
the GS-911 panel.

I saved a log. The bike mostly idled at around 1150 rpm, but I ran
her up to 2700 rpm briefly. Engine temp started out around 106 and
ended around 118. Is that degrees F, or degrees C. OK, I just
checked using convert.exe, and the logged intake air temp of 36
converts to 97 deg F, which is about right for today. So the engine
temp started at 222.8 and ended at 244.4 deg F. The lambda sensor ran
between 888 and 894 for most of the time, dropping to 850 or so when I
rev'ed her a little bit. I tried posting the log, but it wouldn't
go. I'll try again.

Seeya
ATB

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[Paughco]

Hey, I just posted my log! It's titled "log 2009-06-01."

Seeya
ATB

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[Stephan Thiel]

the O2 sensor clearly does not work... this could be sensor, wiring or
in the ECU... are there any modifications on the bike, possibly chipped ?

best,
Stephan

--
========================
Stephan Thiel
www.hexcode.co.za

[Paughco]

Stephan: Thank you for getting back. There are no modifications to
the engine on my GS. No chips, no aftermarket exhaust. I wonder how
long it has been like this. The bike is running great. She got 45+
miles per gallon on the way down to the Chief Joseph Rally this past
weekend. I'm wondering if there is a possility that the O2 sensor is
working, but it isn't being picked up by my GS-911. My GS-911 did
detect operation of the O2 sensor on my '08 K1200S, however.

Seeya
ATB

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[Stephan Thiel]

the GS-911 reads a digital signal... it's the same for all 1150's - if
it works for one... it works for all... and you said it was reading
around 800mV... which is around the high end for these... so GS-911 is
reading what the ECU is seeing..., then it's definitely not the GS-911...

best,
Stephan

--
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Stephan Thiel
www.hexcode.co.za