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Old 09-20-2010, 11:45 AM
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Join Date: Sep 2010
Posts: 1
Mercedes 560 SEL

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?

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Old 09-20-2010, 03:26 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
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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Old 09-21-2010, 03:15 PM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
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]

David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
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