do vag cops have an internal pull down resistor for signal?

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weeblebiker
Master MS/Extra'er
Posts: 421
Joined: Sun May 11, 2008 4:03 pm

do vag cops have an internal pull down resistor for signal?

Post by weeblebiker »

tracking down a random miss fire issue that does not show on the datalogs.
I know I have some noise issues, and suspect im getting some crosstalk between the coils.
my first thought is adding appropriate pullup/down resistors between the cpu and tc4427s and then on the tc4427s to coils, but haven't revisited the diagrams and datasheets yet.
anyone know off hand if the vag cops have internal pulldowns on the signal input pin?
v2.2 box, ms2, dual wheel, sequential ignition, staged injection, boost control, maf
'87 VW scirocco, 2L16V, TD0-14T turbo, itbs
weeblebiker
Master MS/Extra'er
Posts: 421
Joined: Sun May 11, 2008 4:03 pm

Re: do vag cops have an internal pull down resistor for sign

Post by weeblebiker »

nm on the vag cops
the tc4427 is a totem pole setup, so the tc4427 is holding the signal line low :oops:
I need to look at the input trigger side of the tc4427's
maybe I left em floating

or does the ms2 i/o pin hold the line low when it is not high ala totem pole?
been too long since I did this circuit :RTFM:
v2.2 box, ms2, dual wheel, sequential ignition, staged injection, boost control, maf
'87 VW scirocco, 2L16V, TD0-14T turbo, itbs
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