VEMS V3.9 AAN is by default
Conversion to VR, HALL if ever needed for a non-factory setup.
InputTrigger/AudiTrigger with camHALL inverter, which means:
- primtrig=VR (VR on crank as you prefer, nothing to do there)
- sectrig=Auditrigger with camHALL inverter
- pulling camHALL input = GND or 100 Ohm resistor to GND would allow sectrig=VR to go through unmasked
- convert to HALL by: disabling the 2nd LM1815 by removing the sectrig LM1815 (U110 ?) output SJ7 solder-blob on the bottom (that connects LM1815pin12 output to the microcontroller input pin). This blob is on the bottom, under the FETs. output solderblob at the bottom side under the FETS so that HALL signal will reach the processor and work (VR will be ineffective as a result).
If you need to check, basically same HW since v3.6 (eg. v3.8 or v3.8b),
For secondary trigger HALL (or sectrig unused), either a small blob ("electric-short") is needed between the SOT23 NPN, or the NPN transistor is also perfect (inverted signal, also good, sectrig edge is selectable falling/rising, just invert the config is moving from ECU without camhall inverter to ECU with camhall inverter).
See also: