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Old 02-07-2008, 05:26 PM   #1
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Default Electrical engineers needed for this issue...

My OBD2 conversion is near complete, but I found an issue that may or may not be major, but I would like functionality nonetheless.

OBD2 cars use only 4k speed output. My 1993 uses both the 4k speed, AND a 2k speed (which is used only for the multifunction chime module). Since my new PCM does not have a 2k output, I need to either do without the chime module speed input (which I will lose the T2V function, since its the controller that controls it), or come up with a square-wave divider.

Any suggestions??

EDIT: I found schematics online to convert sine wave to square wave, which I might be able to use (take the signal from the VSS directly), and that actually might be the easiest way to go.
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