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#1
06-01-2010, 12:27 AM
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Diagnostic Code Results
Here are the results for the codes I read on my 1993 400E:
PIN 7: 6. Starter lock-out/backup lamp switch. 11. Closed throttle recognition signal to engine control module (HFM-SFI or Left LH-SFI) Fuel safety shut-off to engine control module (HFM-SFI or left or right LH-SFI) PIN 19: 4. Air injection system faulty hot film mass air flow sensor with hot wire. 17. Data exchange malfunction between individual control module. PIN 30: 3. Driver Airbag squib Now the question is what do these codes mean? I can tell that there is some problem with my Air Pump and possibly MAF...I would like to try to solve these problems so I can clear the codes and turn the Check Engine light off. Thanks -Landon
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#3
06-01-2010, 12:49 AM
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In order to clear them do you just hold the button down for 8-10 seconds?
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#4
06-01-2010, 12:54 AM
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yes i think. i have always had a hard time clearing mine though
 there are a couple of good posts about this, if you search you will find them...this site is a goldmine of information..... post your codes after they are cleared and after you've driven for a day or so...that will give you a better idea about what is going on,,,, good luck!!
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1993 300E, 2.8 M104 .....
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#5
06-01-2010, 01:30 AM
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I cleared all of them and so far (without driving it) the only codes that are still present are:
PIN 19: 4. Air injection system faulty hot film mass air flow sensor with hot wire. 17. Data exchange malfunction between individual control module.
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#7
06-01-2010, 01:42 AM
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I tried about 5 times they wouldn't go away...
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#9
06-01-2010, 03:59 AM
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If you take off the black lid to the modules (where it says battery in trunk), there should be about 4 small Delco fuses on top of one of the modules (I think it's the base module). You may want to check those. It's a cheap and easy fix, if it will work.
You may want to pull those modules out and reinsert them while you are there, in case there is a contact issue.
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1993 400E, 256,000 miles (totaled) 1994 E420, 200,000+ miles 1995 E420, 201,000 miles
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#10
06-01-2010, 11:53 AM
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Well so far I have been driving for a day now with no check engine light...Hopefully it stays that way.
How exactly do you pull those modules out?
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#11
06-01-2010, 06:57 PM
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If it's not broken, I wouldn't mess with it. The modules slide down into vertical slots and can be pulled out by hand (Mercedes makes a tool, though).
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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
06-02-2010, 12:37 PM
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Well I just ordered an LH Module out of a 1992 400E and it will be here tuesday so I'm going to have to take the old one out
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