MSefi.com read only forum (Jan.15,2018)

Hi,

I've done some searching, both in this forum and on the Internet and can't seem to find the answer to this question:

What is the timing of the PIP signal with respect to crankshaft position? Megamanual points out that the falling edge of PIP coincides with an ignition event (and mentions that other sources incorrectly say it is not ignition related) but when does PIP go from low to high? Specifically, if one is to compute RPM off PIP, what are the correct edges to use (rising, I assume, since falling is variable)?

It would be really useful if the rising edge is specific to a particular tooth.

Thanks.

Hi,

I read through the three primary patents for EDIS and have understood the timing of the PIP signal. I also am inclined to believe that Megamanual is incorrect on this subject (see caveat below).

Per patent 5,014,676, column 4, line 54: "PIP - Synthesized signal of 50% duty cycle with rising edge at 10 degrees BTDC of each cylinder. This signal gives the engine control module a precise reference of engine position and speed."

This also implies that the falling edge of PIP has no relationship to the actual ignition event. In other words, PIP essentially divides the 36 teeth into six segments (for a six cylinder engine), producing edges every six teeth, aligned with 10 degrees BTDC.

Now, we know that what is patented isn't always what is implemented so i will add that I have not verified this by taking an EDIS module and watching the traces on a 'scope.

Regards.