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  #1  
Old 07-24-2010, 11:48 PM
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check Engine Light on 1995 S420

I have 1995 S420 and the check engine light is on and has been for some time now. I have replaced the wiring harness,the airflow meter, the throttle actuator, intake manifold gaskets. When I unplug the battary the light gose out only a short while. So I read the post about the little red light under the hood. I tried it, it flashed 6 times. Also, at times the engine surges high when you first start it to about 1500 to 2000 only after it is warmed up and shut off and re-started, but once in gear it runs and drives smoothly. This thing is driving me crazy. can anybody give me any suggestions on this matter. If you like you may e-mail me at
docaram1@yahoo.com

Thanks guys,
Dr. Ramsey

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  #2  
Old 07-25-2010, 12:18 AM
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Code 6 on the DM is idle speed control inoperative. The suggested next step for that code is to the read the codes on the Electronic Accelerator, which is pin 7. For this you'll need to build the flash code reader.
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  #3  
Old 07-25-2010, 08:09 AM
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If the engine harness was bad you might want to inspect the harness which is part of the throttle actuator.
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1995 C280
1995 S500 coupe
1990 Mazda Miata
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  #4  
Old 07-25-2010, 11:31 AM
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Quote:
Originally Posted by Pili380SL View Post
If the engine harness was bad you might want to inspect the harness which is part of the throttle actuator.
He's already replaced the throttle actuator.
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  #5  
Old 07-25-2010, 04:32 PM
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Quote:
Originally Posted by deanyel View Post
He's already replaced the throttle actuator.
Just reread. Sorry.
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1995 C280
1995 S500 coupe
1990 Mazda Miata
2004 Suzuki Hayabusa
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  #6  
Old 08-19-2010, 05:53 PM
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now engine sstopped

I took my son to school today and when I made a U-Turn the car just died, I waited for about 30 min it started again and I drove it home. Cut it off and tried to start it again and nothing. So I have replaced the distributor caps and now have ordered the EZL and two coils you think this may have been some of my problems from the start??? I wished someone would put the Red Light code list for these S420's on here I have one but I don't think it's right because it says code 6 is not used. If somebody has this list or gets it e-mail me one (PLEASE) to
docaram1@yahoo.com or docaram@sbcglobal.net

Thanks
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  #7  
Old 08-19-2010, 06:47 PM
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The red LED light that is built into the car only tests the diagnostic module.

The diagnostic module receives information from four other modules-- LH-SFI module (fuel injection), EZL-AKR module (ignition timing), EA module (engine accelerator a/k/a electronic throttle actuator ("ETA")), and the ABS/ASR module.

A code 6 on the diagnostic module is telling you there is a problem with your EA (ETA). You will need to test that specific module (EA module) by building the DIY tester and checking pin 7 of the 38-pin canon plug connector next to where the LED light is. The LED module will not check this pin. Here are the codes for the ETA from J. Forgione's excellent website: http://www.k6jrf.com/MB_EA.html


The problem could be something as simple as changing the neutral safety switch or stop lamp switch behind the brake pedal. I'm curious, how much did it cost to replace your ETA?
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles

Last edited by emerydc8; 08-19-2010 at 07:00 PM.
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  #8  
Old 08-19-2010, 10:46 PM
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I sent it to a place in MI and had it done for $280.00 which was still cheep as hell I drove the car to my son's school yesterday and as i made a U-turn it died and it took me about thirty mins to get it re-started and back home I pulled each distributor main plugs and got no fire so i ordered ezl and two more distributors which i should have next week
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  #9  
Old 08-19-2010, 10:47 PM
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I've been told that you must take the car to a dealer to have codes removed once they come in there is this true???
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  #10  
Old 08-19-2010, 10:58 PM
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Quote:
Originally Posted by docaram View Post
I've been told that you must take the car to a dealer to have codes removed once they come in there is this true???
No, the flash code reader that you were advised to build in post #2 above several weeks ago will both read and delete codes.
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  #11  
Old 08-19-2010, 11:39 PM
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Docaram:

The code reader is really not that hard to build. Just buy the parts listed and lay them out on a table like in the schematic. I did it and I don't have any electronics experience. If you can solder you can do it. Otherwise you will just be guessing.
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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  #12  
Old 08-20-2010, 10:50 AM
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I'm sorry but somehow I must have missed the parts on what and how to buld this codes reader. Will this work on both obd1 & obd2? and yes i do know how to solder. I
appreciate the info. One other question can it be ordered on e-bay?

Thanks,
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  #13  
Old 08-20-2010, 11:19 AM
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I found this on e-bay, look at this hyper-link and tell me if this is what you are talking about please and let me know. Once again I appreciate all of you and what you do to help us all on our perspective situations. LOOK AT THIS LINK BELOW:

http://cgi.ebay.com/ebaymotors/Diagnostic-code-reader-tool-Mercedes-W140-R129-S500-_W0QQcmdZViewItemQQitemZ320570087174QQptZMotorsQ5fAutomotiveQ5fTools

Thanks
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  #14  
Old 08-20-2010, 11:56 AM
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That's the one, but $59 is a bit pricey, around $10 in parts at Radio Shack. I just sent you an email.
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  #15  
Old 08-20-2010, 03:55 PM
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I got both and thank you very much. So once I get these other parts that i have ordered i will recheck everything and let everyone know the outcome.

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