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  #1  
Old 05-22-2003, 12:12 AM
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M119/500E DM Error 4- Air Injection System

It's nice having the local MB dealer tech be a 500E owner. He readily shares tips, especially since he know's I'm an enthusiast of the 500E.

I've been having intermittant "CHECK ENGINE" lights come on, and using the blinking-light counting method, it has always been either LH DM number 4 (Air Injection System) or number 5 (EGR).

Since the M119 engine gets SO HOT, it literally cooks/bakes everything. The rubber tube between the hard-vaccuum line and the EGR was cracked, replaced with Mercedes rubber which withstands the heat and has the correct diameters for the vaccuum lines. No more number 5 for over 5-months.

However, number 4 (Air Injection) was still coming on intermittantly, and although I could hear the clutch bearings go bad, I asked the dealer tech, and he said there is another rubber vaccuum line that goes bad on the air-pump's (aka, smog pump) diverter valve or comes loose if you had weak motor mounts.

Sure enough, I found this rubber connector off and deteriorated. I've replaced the rubber connector, cleared the codes, and hopefully it will stay off.

FWIW, he said the next things to check are (1) Oxygen sensor, (2) air-pump passages in the head (has to be taken off to clean out), and finally (3) the air-pump itself.

:-) neil
1988 360TE AMG
1993 500E

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  #2  
Old 05-22-2003, 10:35 AM
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Neil, thanks for the heads up ... what's the mileage on the 500E at the time of the fault/repair?
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Old 05-22-2003, 11:07 AM
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Our 500E is just about 80K miles.

:-) neil
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Old 03-22-2010, 12:29 PM
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Back again after 8 years/50K miles

Hello old friends. I still have my 500E, now with 182K miles and once again the mileage is growing fast. It's on to the next round of Check Engine lights and error codes. I started researching this morning and found my old thread from 2002, and this one here. I'm counting blinking lights and getting repeated number 5 codes. I'll try Neil's solution, looking for cracked vacuum hoses. I've been making fast runs from LA to San Francisco most weekends for the last few months. The old girl still has original paint and the heads have never been off, and it's still running strong. Electronics are this car's Achilles' heel for sure. But for that, it's easy to love this car.
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Old 03-25-2010, 02:42 PM
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Remember that the built-in LED blinker only shows DM codes. You need a separate, hand-held code reader to pull & clear codes from the other chassis & engine management modules:

LH (fuel injection)
EZL (ignition)
E-GAS (electronic throttle actuator)
BM (base module / power supply)
ASR (traction control)

There are also codes available for the HVAC and SRS (airbag) systems, however these do not affect engine operation or driveability.

For any serious DIY diagnostics, I highly recommend buying a digital scanner that speaks MB OBD-1. There are a lot of live data elements available on the LH injection systems which can help pin down what the problem is. Click here to view a list of most of the data elements available. A lot of people don't realize that digital communication is available for the six main modules, along with live data elements... there is far more than just LED blinks!

Side note - the full list of DTC's (Diagnostic Trouble Codes) for the 400E/500E are in this PDF file.

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  #6  
Old 03-25-2010, 03:42 PM
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Replaced the vacuum lines

Thanks, Dave. I'm an enthusiast, but not much of a DIY'er. My mechanic has a hand-held scanner and also the ThinkPad-based Mercedes diagnostic system. My 500E is a frequent subject of his examinations! He taught me the error code lights code recently, because my son has one of our 124 wagons up in Northern Cal, and I wanted to track that car's codes before he could bring it back to LA for service. In a way, I think counting the lights has given me a different, not necessarily worse, insight into my car's electrical problems. The MB product will show many different codes each visit, but by clearing the blinking lights shortly after each occurrence, it seems to focus the problem a little better onto one repeating fault. The clue isn't so throughly buried in the comprehensive detail. At any rate, my mechanic replaced several of the vacuum lines and an electric vacuum switch after we discussed Neil's post. I won't be heading north on a speed run to SF for another ten days, but so far, no more "Check Engine" light.
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Old 03-25-2010, 03:47 PM
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Thanks for the DTC list!

By the way, Dave, thank you SO much for re-posting the DTC list! That's what I started looking for in the first place!
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  #8  
Old 03-27-2010, 07:10 AM
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Great timing to resuurect an old thread, is a code 5 on the DM on an R129 also an EGR code? I have not seen a file like this one for R129's?

I cleared the code for now with an LED in the 38-pin but expect it will be back. Vacuum lines will be checked next.

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