I'm working on this vehicle and have no spark.. I have 12 volts to the coil but no high voltage going to the sparkplugs. Is the coil bad? Or the ignition module? And I'm not quite sure how to check the ignition module to figure out which of these 2 parts is bad. I have a power probe 2 and was hoping someone could give me some insight as to how to check both to figure out which one is bad. A diagram or detailed explanation is all i need. I'm a mechanic. Just haven't worked on a lot of Mercedes And don't have the means of looking it up on a shop computer.. Doing this work at customers house. Can anyone help?

I would check the crank sensor 1st.

Should have about 1000 ohm resistance & then if you crank over the engine it should generate at least 0.5Vac.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

as always M.B.DOC knows exactly what he's talking about.replace the crank sensor unless already replaced[old one-green sheath new one-black sheath]

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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