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  #1  
Old 06-12-2001, 02:50 AM
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Location: Oakland, CA
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Can anyone provide the meaning of fault codes
9, 18, and 26. A friend has these codes showing
up after his mechanic replaced a module that
controls the AC in his '93 400E.

Thanks.
Forrest

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  #2  
Old 06-12-2001, 03:27 AM
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http://pages.prodigy.net/jforgione/MB_S500.html

That is JimF's website. That site should have the codes for what you are looking for. Good luck!
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  #3  
Old 06-12-2001, 12:20 PM
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Fault Codes for M119

David, thanks for the reply. I checked Jim's site and
could not find a listing of fault codes. He does write
about a couple of sources for the code information though.
Forrest
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  #4  
Old 06-12-2001, 05:58 PM
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'94 S500: only 793 sold!
 
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Reading, the key to success. . . .

Forrest,

The faults codes (called Diagnostic Trouble Codes; DTC) are contained in menu #5. These codes are stored in the DIAG MODULE (N59).

Since you weren't able to 'decipher' the page, here they are:

9 ---Intake Air Temperature sensor (IAT), open/short
18 --Adjustable camshaft timing solenoid, open/short circuit
26 --Upshift delay 1 to 2 (model 123.034) , 2 to 3 (all models)

They all 'point' to the LH-SFI module and need to test it. But, of course, it could be;
"9" -- a loose or bad IAT. It's located in the left side (drivers side) on the air intake hose.
"18" -- a bad camshaft solenoid; located on the header (each side)
"26" -- probably a bad vacuum line.

Hope this helps you.
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  #5  
Old 06-12-2001, 06:39 PM
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Replace your intake Air Temp sensor-it's a $25 part, and takes about a minute to replace. It's the sensor installed in the plastic panel behind the left side headlight that routes air up toward the airbox...it's the piece you remove to re-aim the headlight.

These things are cheap and do go, so get it out of the way for starters. Good luck solving the other issues; sorry I can't help.
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  #6  
Old 06-12-2001, 08:44 PM
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Fault Codes for M119

Jim,

Thanks for deciphering the page. I'll try your
web site again and will pay particular attention
to menu item (5).

Forrest
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  #7  
Old 06-19-2001, 04:33 PM
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Fault Codes for M119

Thanks to all for your feedback. The problem turned
out to be due to a faulty basic control module that
had been replaced to fix an inoperable AC.

Jim, your site has proven very useful to several
people and is respectfully referred to as the
"rosetta stone" of M119 tech info.

Regards,
Forrest
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  #8  
Old 06-19-2001, 06:13 PM
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'94 S500: only 793 sold!
 
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Glad it's fixed!

I had some problems with DTCs and was determined to fix it myself, thus the 'birth' of my page(s).

Glad it helped you too!
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  #9  
Old 06-20-2001, 07:55 AM
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I still stand by my recommendation...perhaps it wasn't the issue this time (Go Jim!!), but they're cheap and do die frequently.
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  #10  
Old 02-04-2003, 06:46 PM
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Quote:
Originally posted by Michael
Replace your intake Air Temp sensor-it's a $25 part, and takes about a minute to replace. It's the sensor installed in the plastic panel behind the left side headlight that routes air up toward the airbox...it's the piece you remove to re-aim the headlight.

These things are cheap and do go, so get it out of the way for starters. Good luck solving the other issues; sorry I can't help.

so what does the IAT sensor actually do for the performance of the car...
aside from turning on that light?
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  #11  
Old 02-04-2003, 06:57 PM
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IAT sensor

The IAT is another 'semi-key' sensor that determines the air/fuel mixture to the engine.

This sensor reads the intake air temperature (thus IAT) and is mixed with the ECT sensor (and others) to obtain the correct fuel mixture to the engine based on the current engine temp and intake air temp. Very complicated these cars!
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  #12  
Old 02-04-2003, 06:59 PM
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YOU'RE TELLIN ME
thanks jimF

do you know how this would affect the performance of a 300CE 24V?
could that contribute to poor gas mileage?
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1984 300CD Turbo Diesel (soon to be "powered by VEGGIE") - dolphin silver

1999 e430 Sport blk/blk, my sexy ***** ;-)

(my other girls)
1992 300CE 24V 3.0L (w124) (R.I.P. "she was killed 7/12/03 by some ricer kids speeding in a honda accord")
1990 Acura Integra RS (w/94' engine)
1966 Cadillac Sedan de Ville (Hardtop)
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  #13  
Old 02-04-2003, 07:39 PM
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'94 S500: only 793 sold!
 
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Haven't posted this yet . . .

because I'd like to get more data but . . . .

I recently changed my Mass Air Flow (MAF) [stevebfl calls it AMM] sensor. Why?? My gas mileage dropped abit and the dreaded DTC#19 registered in my car (CE light came on). Mileage around 14 mpg.

DTC#19= Bad injector(s) or car's self-adaptation (S/A) is at limit in the LH-SFI module.

This failure is common on most V8s between 92 to 95. It seems to occur around 100K+ miles. Have seen four (4) cars that registered DTC 19 with 90K to 106K miles. Mine came on at 103K.

The S/A is programmed by the eprom that's in the LH-SFI module (N3/1) [check my page, menu #1 and/or 2 for its location). The limits are 0.85 to 1.15 as I understand. When the CE lights, the S/A hits the lower limit of 0.85. The car is still running fine, so there's no problem. But since the mixture is a little rich, the car's lambda starts to drop. The system still corrects properly to maintain the correct air/fuel mixture (as close as possible) but you start to burn more gas in the process.

So I changed my MAF. Immediately lambda changed to the lean side. [Waiting for the S/A to recalculate so that's why I haven't posted this.] For example, the injector duration changed from 3.2 millesecs to 2.8millesecs. That means you using less gas for the same, and in my case, much better power even at low rpms (1500- 2000). My gas mileage has gone up: 16.2 mpg on the last fillup.

So will the IAT do the same thing? Don't know but I think that the MAIN determining element is the MAF and secondarily, the O2 sensor. The IAT would probably not be that important for your '90 300CE as far as gas milage is concerned. My opinion.

BTW, if anybody has the DTC#19 problem, send me email because it can fixed very easily at low cost.
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Last edited by JimF; 02-04-2003 at 07:44 PM.
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  #14  
Old 02-04-2003, 07:41 PM
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thanks...btw....
love the s500 cpe...
which is my choice for my next mbz...
presently i've got the baby of the two...
90' 300CE

lol
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~there is no spoon~

1984 300CD Turbo Diesel (soon to be "powered by VEGGIE") - dolphin silver

1999 e430 Sport blk/blk, my sexy ***** ;-)

(my other girls)
1992 300CE 24V 3.0L (w124) (R.I.P. "she was killed 7/12/03 by some ricer kids speeding in a honda accord")
1990 Acura Integra RS (w/94' engine)
1966 Cadillac Sedan de Ville (Hardtop)
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  #15  
Old 08-30-2004, 10:31 AM
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1994 s 420 dtc. code 19, need to know how to FIX

hello, i have a 94, s-420 haveing a problem with dtc, cod 19, can any one tell me how to remdy this problem, from what i no code 19, mean fule injectors open/short in lh-sfi control module n3/1 at limit/ can any one explain tis to me on how i can fix,,, thank,s meldwyer car is useing alot of GAS

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