New ECU (v3/10581 AAN) installed and updated the config
- can you detail the "updated the config" ? Or perhaps provide the "updated" .vemslog or .vemscfg for review) ?
Before the engine starts with the key turned to the pre-ignition state, my rev meter jumps to above 2000rpm and my dash warning lights up the LOW OIL LEVEL. Both stay up unless i start the car.
I have only connected the WBO2 sensor and nothing more.
Please tell me how to fix this problem and why it appears.
I have emailed a photo about this and a config at info@vems.hu
Today i also tested the lamda sensor as my VE table showed it was too rich
- the VE table is a configured set of constants it does not change...
- Maybe the lambda reading and/or EGO correction indicated sg... what exactly ?
- Too rich ?? (if wbo2 calibration is lower than real => lambda reading shows "not rich enough", instead of "too rich" )
Upon check and calibration, the 20.9 was NOT ABLE TO BE REACHED as it required a higher number than the 255 top value.
- If you care to mention, what was shown O2 % value with wbo2_cal=255 ?
- Can you share your measurement of the sensor Rcal = ... Ohm ?
- do you have another sensor (LSU4.9 or LSU4.2)?
- is it possible the sensor was dropped (eg. to concrete floor) ?
- note that if WBO2 calibration is lower than optimal (eg. not calibrated, or maxed out), the WBO2 reading is still REPRODUCIBLE.
- It just means that lower deviation from 1.0 lamda is displayed (lower than the real 20.9% O2 value is displayed; and higher than real lambda value dislpayed: eg. 0.95 instead of 0.94, or 0.9 instead of 0.88 ...
- it does not even prevent closed loop feedback EGO/lambda mixture control (just the values would need compensation).
I also tried 1.2.30 version without any success.
The key to success is measurements (even if just a few and simple in this case, they are important).
We suspect
- the sensor might be faulty (we do NOT heat the sensor, the sensor is tested by the manufacturer - Bosch in this case).
- or perhaps the SSC5-LSU4.9 small loom might have 2 wires swapped, or perhaps all mirrored ? (we test the v3, and the manufacturer of the loom tests the loom, we just supply that from the shelf).
- we test the v3 carefully before sendout, but of course nernst or pump HW problem cannot be completely ruled out (or misconfiguration, which we should verify also from vemscfg / vemslog).
Besides the measurement, write the SSC5 pin number and the wire color for each pin (and the wire-color at the LSU4.9 sensor !), and verify connectivity and pin-correctness of the small SSC5-LSU4.9 loom according to the [LSU4.9 pdf].
- DC voltage between pump- and GND ? (4V or so)
- SSC5/ ... ? loomwirecolor/sensorwirecolor ?
- DC voltage between nernst and GND, if 1k (or other, 1..100k documented value) resistor is connected between nernst and GND ? Near 1/(1+27)*5V = 0.179V ?
- SSC5/ ... ? loomwirecolor/sensorwirecolor ?
- DC voltage between heater+ and GND ? (12V or around?)
- SSC5/ ... ? loomwirecolor/sensorwirecolor ?
- DC voltage between heater- and heater+ ? Can you see the sensor internally glow to cherry-red and get warm, and slightly smell while the voltage climbs up above 6..9V when WBO2 calibration is started ?
- SSC5/ ... ? loomwirecolor/sensorwirecolor ?
- optional measurement if NOT already diagnosed by the above. DC voltage between pump+ and pump-, with 100 Ohm between pump+ and nernst; and 100 Ohm between nernst and pump-?
- SSC5/ ... ? loomwirecolor/sensorwirecolor ?
Hello VasilisP,
To determine what is going on please provide a bit more information, please answer the following questions for me:
- are you using a new (or old please specify) lsu 4.2 or lsu 4.9 probe during the free-air calibration and is it in free-air not in exhaust ?
- is your wiring from ssc5 to wideband connector verified and known good ?
- when trying to calibrate your sensor, does it get warm ?
- could you make a vemslog of wideband calibration warmup cycle (let it run for 4-5min) and add the vemslog to your page here for review.
Using the provided information i will provide hints on how to proceed.
Best regards, Dave