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Registered
Join Date: May 2002
Location: Santa Barbara, CA
Posts: 4,821
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Jack,
you need use an oscilloscope to the CPS pins in the 55pin connector and then crank. The O-scope should show at least 3Vpp while cranking. See here for the WSM page. For a quick check you measure resistance between the "hot" pins 1 and 2 of the black reference sensor plug. I just measured mine and it is 535 Ohm (my engine is currently out of the car)
Let me know how it goes. If all else fails I have a 964 loaner DME for testing....
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430
I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs
Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!!
How about a NoBadDays DualChip for 964 or '95 993
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