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Old 04-01-2008, 06:17 AM
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Join Date: May 2006
Posts: 86
1903 16 valve ignition module testing

Is there a bench test for the ICM once taken off the car. What are the resistance values for the terminals. Are they interchangeable with other 190's with the ezl ignition. The one from my car was made by Siemens. All others I see are made by Bosch but it looks exactly the same.

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Old 04-01-2008, 08:03 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Possibly an electronics specialist could make tests... but I have never seen those type of figures.

We always test the inputs & if they're correct & still no dwell signal to the coil...bad EZL.
MERCEDES Benz Master Guild Technician (6 TIMES)
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Old 04-01-2008, 04:57 PM
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Join Date: May 2006
Posts: 86
Can any 16 valve 190 owners take a look at their ICM module on front driver side fender and read me the Bosch part number. Give the upper and lower numbers.
It should read something like

Upper 0 227 400 642
Lower 004 545 57 32 For Bosch
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Old 04-01-2008, 05:01 PM
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Join Date: Apr 2002
Posts: 3,473
I came across this site the other day. Please let us know how they do.

Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
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