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).
2nd WBO2 hardware channel on v3.x. Verification of this doc is in progress, use GenBoard/VerThree/Schematic for now.
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 ?
- 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
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
- please provide link to vemscfg or vemslog.