Just bought this 94 S500 with some minor front end damage, it has 119k miles, the interior is very clean, I drove it home and the next day went to get gas and then the check engine light comes on, I check codes and get 6, 9 & 18 I have a feeling they were already there and he reset the light before I got there, am I hosed are those codes going to be expensive?

Thanks Mike

Heres link of the guy you want to send PM he knows all about that model
http://k6jrf.com/MB_S500.html#MYCH

Hope this helps you out

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1995 E320
1998 E320
1999 E320 4Matic
2000 E320 4Matic
2000 ML320
2007 C230 Sport
2003 Cadillac CTS

Check out my Mercedes web page esp Menu#6 to decipher the Diagnostic Module (DM). DM #6 is the "badie" ... could mean a new ETA, Menu#24.

DM #9 = IAT sensor ...could be dirty or not there?? Clean with brake cleaner.
DM #18= probably a vacuum leak someplace ???

Reset all codes and drive awhile; see what comes back.

__________________
Regards . . . . JimF
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'94 S500 Cpe

Visit my Mercedes Web Page

Son in law is here today he looked into the wiring harness and we discovered a lot of insulation missing on a few of them causing shorts, we are headed to the bone yard for salvageable stuff =) any thoughts?

Thank you for your help in advance.

I normally mention "changing the wiring harnes" but didn't b/c most all MBs between '92 and '95 have had the w/h replaced by now!

You MUST replace it before doing anything else. That in and of itself may fix all of the DTCs that are appearing.

Replace it, reset all codes and see what happens.

__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page

Ok replaced wiring harnes got rid of code 9 now just 6 and 18 left.

You should read the DTCs stored in each of the following ECUs; LH (pin 4), ASR (pin 6), EA (pin 7), Base (pin 8) and DI (pin 17). That should give a some further insight as to what is needed.

As I wrote, code "6" points to the ETA going or being bad. But that s/b confirmed by reading the other ECUs.

__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page

Son in law is at Radio Shack getting parts to make your tester, it has the mini type of pins. We will be testing very soon we will follow your instructions, you have been VERY helpfull thank you.

Mike

Ok here are the codes we got

LH = 13 & 25 (maybe that would explain the clicking noise on right side)

ASR light stayed on as soon as we plugged into pin 6 and would not blink

BASE = 6, 10, 11, 12, 13

DI = 1

trying to figure out why 10-13 would be on and the car runs, AC works and the belt is not broken or slipping

Thanks Mike

I have a good used ETA you are welcome to test with if you find internal or pigtail ETA wiring bad. Just shoot me PM if so.

Paul

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1983 380SL
1995 C280
1995 S500 coupe
1990 Mazda Miata
2004 Suzuki Hayabusa

Strange codes for the Base Module but that's what happens many times.

__________________
Regards . . . . JimF
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'94 S500 Cpe

Visit my Mercedes Web Page