MembersPage/WolfTm (2018-06-07 13:19:01)
  • if sensor heating is a bit weaker (cannot reach target) for any reason, might need to up-adjust WBO2 heater abs limit (up to 255).
  • Ok, will try... but the fact it happens more often when using the car hard (so higher egts) would make me think it's not weak heating related?
  • What is sensor measured Rcal (Ohm) value ?
  • Will discover asap, car is 400 kms away
  • Is the ECU configured for LSU4.9 ?
  • for LSU4.9 is the 27k (or 27k4) nernst pullup installed inside ECU, or outside in the harness ? What DC voltage is measured across known and documented value (1k .. 10k) pulldown resistor between nernst and GND ? (with sensor disconnected, ECU on, but engine off)
  • That measurement is important. New ECU-s are, by default made with this 27k nernst pullup to support LSU4.9 sensors. No side effects have been experienced with LSU4.2 (if otherwise configured properly) but need to know the details anyway.

Current fw is 1.2.38.



Granting (by info sent in priv),

Do you have ISP cable (Parport DSUB25 or USB-ISP ?) Will need to follow

http://vems.hu/vt/help/v3/general/bootloader_upgrade.html

If considering bootloader upgrade, (so that internal BOD can be disabled) highly recommended:

PLEASE CHECK THAT v3/10267 has reset chip at the atmega128/pin20 reset, eg

See GenBoard/VerThree/Schematic eg

[v3.8.pdf]


Engine off, ambient sensor temp (~20C)

Hint: The output is almost certainly connected to an input with pullup (possibly strong pullup).

Sensor connection (seems good):

EGT sensor is K type yellow-red wires:

  • yellow = green (plus wire) to board GND
  • red = white (minus wire) to the board cathode on corner