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Registered
Join Date: May 2002
Location: Santa Barbara, CA
Posts: 4,821
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You need to select the 20k setting in the Ohm area. Rotate the dial 3 clicks counter-clock-wise. Currently you are measuring "a voltage drop across a diode" and the reading makes no sense. It will read zero when you touch the leads and a real voltage if you connect the leads to a diode in the right way.
OL is open-loop. This means there is no connection (or infinite resistance) between the leads. When this shows up while you have the leads on either end of a spark plug wire it's definitely bad.
Ingo
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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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