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Everything Electrical & Electronic Have an electrical problem? Lighting, Alternators, gauges, DIC, HUD, etc? Post it here. Please post Audio problems in the Audio forum, and Engine control problems in the appropriate Mechanical forum for your year.

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Old 02-07-2008, 04:26 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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