Setting up 4.9 LSU on 3.6 board

[Machismo]

I'm a bit behind the schedule and trying to speed up my first Vems installation, so another 20â,¬ / 100mBTC for anyone who succesfully guides me though any tricks that are needed for correct 4.9 setup. Notice that I don't know anything..  :D

At the moment I have a 1.2.30 firmware, but if needed can update to 1.2.31. Vemstune is the the latest version and ini files have been updated.

I have already done the wiring and measured against car's ground, that 12v is coming to 4.9 sensor pin 4 (gray wire). Other wires:
pin 1 (red) - EC18 / 9
pin 2 (yellow) - EC18 / 7
pin 3 (white) - EC18 / 18
pin 5 - not connected, empty
pin 6 (black) - EC18 / 13

I got the wiring info from here:

http://vems.hu/vt/help/v3/v3_wideband_settings.html

Here are the Vemstune settings, haven't touched those values so they can be totally wrong:





First questions:

Is my wiring correct?

I made no hardware changes to the board, should I do something?

Somebody mentioned that they had some wideband values on a paper that came with the board, I don't have that, should I ask for it?

I connected the sensor and noticed that it does not heat up. Just to test heating I pressed start calibration and it said 'heating'. During that I measured voltage between pin 4 and 3 and there was some small activity there, but only between 0 and 0.4 volts. Pin 4 has constant 12 v so that is not the problem. So it must be pin 3. How to fix that?

[mads b (dk)]

Try looking here... hardware changes are explaint http://vems.hu/download/sensors/LSU4.9/LSU4.9_pinout.pdf

[Machismo]

Try looking here... hardware changes are explaint http://vems.hu/download/sensors/LSU4.9/LSU4.9_pinout.pdf

Thanks. I measured the nernst voltage according to the pdf and it was 3.7V, so I installed the 27k resistor, after which the voltage was 5V. I guess this is the only change that needs to be made.

After that I did the sensor ohm measurement between pins 1 and 5 and the result was 102 ohm, so I entered Rcal value of 163.

On the pdf it said something about Ri target value of 165, so I entered that also, but don't know if it's correct.



I also choose set of default values from the bottom menu, no idea if these are any better than the ones I had before by default:



At this point I tried if the sensor heats now. It didn't, so I took another look at the heater fet and it was simply installed on the wrong channel! I added a second one, so both yellow locations are now populated. I plan to add a second sensor in the future so that's ok.



The heating started to work right away, after a few minutes the sensor tip was too hot to touch.

Lsu 4.9 has no need for freeair calibration, but I guess that not count the initial software calibration?

At first the ohm measurement derived value seemed to be a bit off



So I changed the Rcal value from 163 to 166. Not a big change, but now it's spot on:



I did some testing and wideband seems to be working without any problems... Correct me if I did any mistakes?

[mads b (dk)]

Im not and expert but it looks good to me.....

[black]

, so I installed the 27k resistor, after which the voltage was 5V. I guess this is the only change that needs to be made.

how (where) did you install the resistor ? from where did you get the voltage for the resistor to end up with 5V?

I am planning to test the 4.9 too because we have trouble with 4.2 and firmware 1.2.3X on 3.6 board

[Machismo]

Im not and expert but it looks good to me.....

Ok. I like the way how it works so incredibly fast, my old innovate LC1 controller was much slower to react. I think it had a 4.2 sensor. I had to calibrate it often to keep it somewhat accurate.

I wonder if adding a second sensor to the other cylinder bank exhaust will make the Live Ve Analyzer autotune work more accurate or faster. There is no mention of that in this guide

http://vems.hu/vt/help/main/tools/live_analyzer.html

how (where) did you install the resistor ? from where did you get the voltage for the resistor to end up with 5V?

I just made a wire that has  the 27k resistor in series with it and soldered the other end to EC36 pin 28 (+5v supply) and other end to EC18 pin 13 (wb02 nernst signal).

[Kamuto]

, so I installed the 27k resistor, after which the voltage was 5V. I guess this is the only change that needs to be made.

how (where) did you install the resistor ? from where did you get the voltage for the resistor to end up with 5V?

I am planning to test the 4.9 too because we have trouble with 4.2 and firmware 1.2.3X on 3.6 board

0 problems with that :)

[Machismo]

Bonus picture of the sensor wiring making

[black]

thanks...  so this should be PIN 12 on M55 connector...  I will try this soon and report...     LSU4.9 is already ordered..

[black]

Today I modified my 3.6 to LSU 4.9

Measured the nerst Voltage -> 3,7V

Soldered a resistor 27K from EC36/28 to black wire nerst inside ECU

Measured -> 4,99V

Measured RCal on LSU4.9 Sensor -> 95,5 Ohm should be calibration value 157

Connected Sensor to ECU an started wideband calibration (LSU 4.9 sensor) free air - calibration was way off. Needed to correct  the value to 174 to get pointer at the right spot

Engine Start - Value on VEMS Display same as Value on Zeitronix Display - so calibration should be ok

But why is the Rcal calculation so wrong in this case??

best regards

[Machismo]

Sometimes when when I'm running low battery on my multimeter or there are some problems with measuring wires I get totally false readings. You might want to try to measure for example 100ohm resistor to see if it's working. If it is, remeasure the sensor.

[black]

Sometimes when when I'm running low battery on my multimeter or there are some problems with measuring wires I get totally false readings. You might want to try to measure for example 100ohm resistor to see if it's working. If it is, remeasure the sensor.

I measured the 27K resistor an it was correct :-/

update...  100Ohm is also correct...

[VEMS]

Hello Black,

But why is the Rcal calculation so wrong in this case??

The values we provided are ball-park figures based on an average reading on current boards to be used as a starting point for calibration; FYI Bosch calibrates the RCAL resistors per batch, so one sensor might be at the far left (or far right) of the spectrum and still get the same RCAL. There also might be some variation in the on-board resistor values, all in all .. The free-air calibration takes the whole loop response in account and calibrates for this.

You are only 174/157 = 10-11% from the median value of 157 no problem at all after calibration your sensor should work perfectly.

Best regards, Dave

[black]

perfect.... thanks

[Machismo]

Now after about 30 hours of use, the 4.9 wideband has started to show erratic readings, it might show too lean or usually way too rich. The engine itself is running fine and other independent wideband at the other exhaust pipe is has showed consistent readings all the time so the Vems controlled 4.9 readings really are erratic... I wonder what has happened. The sensor is supposed to be durable, so I must have done something wrong?