I've got the sears multimeter with duty cycle and would like to read the codes on my '90 300D. I need to know what to do next- I assume the probes go to the diagnostic connector, but which pins? Do I need to read duty cycle in Percent or Hertz?

I have the MB manual to lookup codes, if I can read them.

Anyone done this or know how to read these codes with the meter?

Thanks friends!

John

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1994 E420 43k (pickup, solid)
1990 300D 2.5 127k (sold) (now driven by friend)
1991 300D 2.5 73k (sold) (incredible car)