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Summary of change:
'''If a certain VEMS ECU is ordered with "Dual WBO2 requested"''' (option, or order comment), this '''should NOT be needed.''' '''Provided for reference''' (during some debug/diagnostics, or if converting an old device ordered without Dual WBO2). For calibrating the sensor(s), see DualWidebandCalibration ---- '''2nd WBO2 hardware channel on v3.x'''. Verification of this doc is in progress, use GenBoard/VerThree/Schematic for now. http://downloads.vems.com/doc_images/dual_wbo2_check.png Problem: When I bench test/calibrate: * GOOD: Gnd to pump- is 4V as desired both controller channels * GOOD: pump- to pump+ is -2mV, as desired both controller channels * OOPS: '''pump- to nernst is ~260mV''' and '''I can't get the value up near 450mV''' no matter what I use for wbo2_nernst_dc_target. I notice the '''second heater stops heating when the pump- to nernst goes positive''' (when it normally goes to 450mV). Thoughts on this? I'm using 2 resistors ( pump- '''100 Ohm''' nernst '''100 Ohm''' pump+), as outlined in the Hardware Test page. * Should I use the 100 Ohm resistors on both channels at the same time ? ** we definitely test that way. Please try, ** and '''measure resistor values (just in case), and pump+ voltage also''' (double of nernts, when measured from pump- as a base) ** although should work to calibrate them individually Calibration data with 2 100 ohm and 2 95 ohm (didn't have through hole 100ohm left) * Gnd to Pump- 4.00V * Pump- to Pump+ ** wbo2-1: -0.8mV ** wbo2-2: -2.0mV * Pump- to Nernst ** wbo2-1: 244mV ** wbo2-2: 270mV * Note, VemsTune "Calibrate first channel" appears to start both channels. "Calibrate second channel" appears to start both channels as well. Latest VemsTune nightly and ini files updated. I'll document the process similar to GenBoard/Manual/WideBandHardwareTest once I understand what I'm missing with this dual wideband testing. First we review your '''actual configuration''' * 2nd WBO2 enabled ? most likely, but please check ** Yes * [http://vems.hu/download/v3/firmware/config_1.2.23.vemscfg dummy config] (outputs disabled), enable 2nd WBO2 manually * vemscfg and vemslog. http://vems.hu/vemstune/sharingcenter/reports.php?cmd=view&key=TjRWqk It might not be impossible to reporoduce the setup that way. (although something simple HW thing is more likely, like something interfering near EC18 /1 ?) **Hi, as I understand you are modifying existing vems board, have you guys removed solderblobs for wheelspeed 1 and knock 1, I remember I had some bad experience when was trying to make second wb working, those were the problem. Valdas. And btw, you seem to be missing c26 in your list of modifications. *** C26 didn't help the problem *** Already took care of the solderblobs for knock/wheelspeed and the one for second wbo2. I need to add that SJ18 (bottom side) to my picture. ---- I usually use this document: http://www.vems.hu/wiki/index.php?page=GenBoard%2FManual%2FWBSensorControllerCompleting * That's the doc I followed to add second wbo2. Note that doc is the one that says C26 is part of pump- (both channels) but C26 is not fitted at least on v3.8b. Adding it didn't improve anything --- have you removed solder blob which puts ec18-17 to constant ground? I'll be converting one ecu to dual lambda one in few days, will check what was missing there. PS, captcha stuff seems to be throwing error on chrome browser. ------- btw, you need to remove solderblob for wheelspeed and for knock, then it can be used. valdas
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