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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). If you publish the required (basic) measurements, and still not diagnosed the issue, then we'll send you LSU4.9 if necessary (a sensor that we might pre-test for you). 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 [https://shop.vems.hu/catalog/lsu49-wideband-sensor-p-193.html 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
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