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  #1  
Old 04-07-2006, 12:02 PM
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Question testing ignition control module??

My 1984 500SEL is having starting problems and from looking at a few of the posts here it appears it could be located in nthe ICM ot the coil. Is there a way to test the ignition control module or is it a replacement only option?

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Old 04-07-2006, 01:14 PM
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on that system you check the module for power, ground, & trigger signal from distributor to the module. If that checks out then the module is at fault!
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Old 04-07-2006, 02:30 PM
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Quote:
Originally Posted by M.B.DOC
on that system you check the module for power, ground, & trigger signal from distributor to the module. If that checks out then the module is at fault!
The power and ground would seem to be rather easy to accomplish. How do you check for trigger signal? With a multimeter?
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Old 04-07-2006, 03:02 PM
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The "green" lead for the distributor must generate a small A/C voltage durning crank. a few tenths of a volt A/C should be enough.
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Old 04-07-2006, 03:49 PM
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Thank you M.B.Doc.

I wanted to shorten that to just Doc, but didn't want to offend.
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Old 04-07-2006, 05:47 PM
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hard to affend an old guy.. doc is fine
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  #7  
Old 04-18-2006, 11:05 AM
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I unplugged the green lead from the distributor, but noticed it has a outer and inner contact. Do I connect between the wire and the ICM or between the wire internals?
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Old 04-19-2006, 07:09 PM
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I purchased a repair manual and have located the section on testing the ignition system. I believe this will give me my answers.

Thanks again Doc for the help.

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