LSU 4.9 configuration

[MK]

Dear friends!

Our VW T3 bus with installed 1.8T 20V engine and VEMS ECU (1.1.81)  has successfuly entered streets and is waiting for a final tune touch from GintsK.

As GintsK found out, our installed LSU 4.2 WB sensor (originally taken from Audi B6 S4 V8 engine) is not in full working order (it needs to be replaced)

A good friend of mine gave me for free this type of WB (LSU 4.9, comes from Peugeot car, don't know which one):



Based on the info found in the forum (http://www.vemssupport.com/forum/index.php?topic=1389.0) it's very easy to damage this type of WB sensor if it's not configured correctly.
Therefore, I'm asking for a helpful hand on finding right info on what parameters should be put into VEMSTUNE WB configuration window.

Thanks for the reply in advance!

Kind regards,
Krists

[MK]

I have gathered this information so far:

1. Power supply H+ nominal: 7.5V (LSU 4.2 - 9V)
2. System supply voltage: 10.8V..16.5V
3. Heater power steady state: 7.5W (LSU4.2 - 10W)
4. Heater control frequency: > or equal to 100hz (LSU4.2 - >2hz)
5. Nominal resistance of Nernst cell: 300 ohms (LSU4.2 - 80ohms)
6. Max current load for nernst cell 250 pA (LSU4.2 - 10(DC)/250(AC) pA)
7. EGT operating and max. temp range are same for both sensors
8. Hexagon temp: < 600C (LSU4.2 = <570C)
9. According to http://wbo2.com/cable/lsuconns.htm and Bosch tech. docs , both sensors share the same wire color assignments (though connector physical dimensions and pinout numbering differs)
10. Signal output: IP meas/ Ua (AWS),the same for LSU4.2
11. Accuracy at Lambda 0.9: - 0.80 +/- 0.01 (the same for LSU4.2)
12. Accuracy at Lambda 1: 1.016 +/- 0.007 (the same for LSU4.2)
13. Accuracy at Lambda 1.7: 1.7 +/- 0.05 (the same for LSU4.2)


According wiki, this is the wiring diagram for LSU4.2:


This LSU 4.9 sensor has green (Cal R) wire  in the connector (there is no such wire in LSU 4.2 connector). What should I do with it?
I don't want to trial test sensor wired to VEMS before I have no info regarding config changes of WB settings in vemstune.

Bump for a help!

[rob@vems.co.uk]

That pin-out is for the VEMS ECU, sorry to say that theres not much chance of getting help around the PID tuning and control of the LSU 4.9 on here, you may need to address the developers directly via where ever you got the wideband from...

Cheers

Rob

[jrussell]

This is one of those situations where you'll probably waste far more resources to get the LSU 4.9 working than it would take to earn the money to purchase a new LSU 4.2 you can plug right in and calibrate with no pain at all.

[MK]

That's what I thought. Anyway, I replaced sensor with new 4.2 sensor and it's good to go!