Cossi Triggerpage
Engine starts only with reverse crank sensor polarity.
- reverse of the factory?
- or reverse compared to what should be good ?
- reverse of the right polarity, VR sensor signal is rising. ( in this case I won around 10 degree of advance)
Primary tigger:
- 665 Ohm (with sensor disconnected)
- 148 mV (with sensor connected, ignition ON, not cranking)
Secondary trigger:
- 817 Ohm (with sensor disconnected)
- 0 mV (with sensor connected, ignition ON, not cranking)
- NO pullup: might be very sensitive during cranking. 10..22kOhm pullup to +5V might help
- Tried, but nothing changed. The same result with 10-15-20kOhm pullup to +5V. We get good rpm values, but so far I can't adjust TDC with the ign_tdcdelay value.
- NO pullup: might be very sensitive during cranking. 10..22kOhm pullup to +5V might help
The LCD and Megatune shows the right RPM during cranking.
When I try to positioning ign_tdcdelay, I get only erratic crank angle (measured by strobe) as I change the value:
(ign_crank_advance=01 ,crank advance 0.25 degree)
- ign_tdcdelay=C8 (100 degree) the timing light shows ATDC 10 degree
- ign_tdcdelay=A4 (82 degree) the timing light shows BTDC 70 degree
- ign_tdcdelay=AA (85 degree) the timing light shows ATDC 2 degree
I can't make spark between BTDC 70 degree and ATDC 2 degree.
2007-08-13
I do some measurement by scope with 15kOhm pullup to +5V on secondary trigger (both sensor conected with the right polarity) :
![[Scope screenshot for detais]](http://www.metatron.hu/karesz/crank2.JPG){kind=link}