Check Engine Light 94 E320 - Page 2 - PeachParts Mercedes-Benz Forum

Arthur Dalton · #16 05-06-2003, 07:06 PM

Because you seem to consistantly bring up the AIR fault code along with 19, I would give a fast check to the AIR system, specially the vac lines.
You mentioned that you have checked the main engine vac feed
line to the SOV that I mentioned in an earlier post, so I would next check the one that goes from the AIR SOV to the AIR Control Valve. This is the valve between the Pump and the exhaust ports 3 and 4 in the head that, when vac from the energized SOV reaches, allows the pumped air to get to the CAT. [for rapid cat heat and hc emmissions aid]
If this line is leaking/off the Air control valve, the AIR system will not work and a code will pop. At the same time , the line can cause a lean condtion.. enough to do a 19, ???? prob not ... but worth a look see.
The reason I mentioned the EGR and Purge valve leaks before is that these are both large lines and could pop a 19. [ too much for the stop limits to correct]
If these lines/ valves seem to be OK, check and see if pump is getting power, etc. for that code..

wjm · #17 05-06-2003, 10:26 PM

the Service Bulletin yo mentioned was for the v8 only. It said to replace the computer giving me the #19 code with another one with a different part #.

I found someone on this forum who had the upgraded chip, so we copied it and placed it in my computer. It solved the problem, as the only difference between the 2 computers was the software on the chip.

Anyway, if there is a newer version of the 94 E420 computer, maybe we can grab the chip from it.

If you get a chance, send me the BOSCH and Mercedes part number from your computer. Maybe we can see if the 95 had upgraded software that we can test in your car.

Just a thought.

JimF · #18 05-06-2003, 10:37 PM

the car is a '94 E320, not a '420'! Nuff said!

wjm · #19 05-06-2003, 11:01 PM

Yea, I knew that. It is a typo above. I meant to say that we should check to see if there is a newer version of the computer available for the E320... possibly on a 95.

JimF · #20 05-07-2003, 01:16 AM

can't read?

This is the first instance that I have seen of a non V8 having this problem. My tech has never seen one either, and he has worked on Mercedes for 30 years!

Yes, if such a 'chip' is available, it would be advantageous to Zafar.

Arthur Dalton · #21 05-07-2003, 09:20 AM

There is an ECU part# change , but Benz specifies changing
part# for part# [ same] when changing ECU..

Another item I did not mention that may be of interest on trim
code issues:
The led/sw access code system also has an ECU memory reset/reactivate procedure that allows the adapt memory to get back to "Mean". When changing parts/repair after codes , this should be done ..
I assume this was done when 02 sensor was changed, as I believe it is auto reset when done w/HHT...
But, for the benifit of theDIYers w/o HHT scanners....
- After one clears stored fault codes, code 1 will appear- verifying you have cleared the codes...you can now reset/reactivate the ECU adapt memory..
The Reset sequence is:
After bringing up code #1 [ No codes stored],
Wait 2 secs
Hold led/sw 6-8 secs
Turn off key 5 secs.
Turn on key 10 secs.
Start car

This is not to be confused with the simple 'Clear Code" procedure
of the Led/sw... that procedure does not get to adapt memory..
This procedure can only be done AFTER a code 1 Flash.....
Someone here may know more about this and/or have a better explanation...

wjm · #22 05-07-2003, 11:00 AM

Good info.

JimF... you need to add this to your web site if it's not there already.

Willy

zafarhayatkhan · #23 05-07-2003, 01:09 PM

excellent idea WJM. I will post the part numbers this evening.

Zafar

zafarhayatkhan · #24 05-07-2003, 03:46 PM

Steve,

According to Alldata, the 94 E320 ECM has 25% adaptation range.

"Mixture Preparation Self-Adaption

The Lambda control system determines fuel injection duration precisely so that the fuel/air ratio is kept constant at Lambda level 1 (equals 14.7 kg air to 1 kg fuel) under all operating conditions.

Should malfunctions occur in the form of:

Intake air teaks,
Injector wear or carbon build-up,
Engine wear,
Contact resistance in mass air flow sensor,
Defective diaphragm pressure regulator,
Defective purge switchover valve,
the engine control module automatically corrects the fuel/air mixture by adjusting the fuel injection duration.

The degree of correction is constantly calculated and permanently stored if the following conditions are satisfied:

Engine coolant temperature < 52 °C at start.
Engine coolant temperature between 80 and 100 °C while driving,
Intake air temperature between 0 and 55 °C.

Air/fuel mixture self-adaptation occurs at idle and under partial load. The maximum degree of correction towards rich or lean is 25%. After fuel injection system or engine repair work is performed, the engine control module will automatically adapt itself after approx. 10 trips. After eliminating a malfunction or after trial installation of an engine control module from another vehicle, the self-adaptation feature must be reset (see "Resetting and Reactivating ECM Memory").

JimF · #25 05-07-2003, 05:09 PM

reset technique but it didn't work on my car and two others. It's supposed to but . . . .

So nobody has found a upgraded eprom for the 320 engine???

zafarhayatkhan · #26 05-07-2003, 05:20 PM

I got the following numbers from the ECM

Mercedes:
124 440 0410 (19-03-93) (29-03-94)

003 545 56 05

Bosch:
0265 106 080
CG284631541
013 545 8632

wjm · #27 05-07-2003, 10:33 PM

Ok,

Here's the scoop.

Try searching for a used ECU here:

http://car-part.com/

What you're looking for is a computer with the same "BOSCH" number (0265 106 080) but a different Mercedes part number. Try getting as much info fom the box as possible,

stevebfl · #28 05-08-2003, 08:01 AM

I have no particular info on the numbers but I can tell you that there is no way in H that you will find the same Bosch number but different MB numbers. bosch even creats a new number for a part when they sell the same part without the MB number on it.

Every change of any kind gets a new number. Software especially.

Years ago Bosch sent a flier around (to Bosch Service Centers)saying that they would provide no control units till 5 years after a car was produced as they (at that time - at least 15 years ago) couldn't tell until atleast that amount of time the final software the manufacturer intended to call appropriate for that year.

With the current software situation that can change daily.

Arthur Dalton · #29 05-08-2003, 10:05 AM

According to Benz ADM-410 Notice"

94/95 E320-104

As of chassis C117898 , use 016 545 57 32

[There is one of those at WJM site - $300
They list it coming out of a '95 ..]

Before C117898, use 017 545 32 32

They do not recommend interchange...

wjm · #30 05-08-2003, 11:23 AM

Steve,

2 years ago, you were kind enough to fax me the Service Bulletin for the Code #19 problem that the 94-95 V8s were having.

In my instance, the old problematic ECU (code #19 problem) for my 94 E420 and the replacement one that Mercedes recommended had different "Mercedes" part numbers, but they indeed had the same exact "Bosch" part number. That is why I had assumed that the only difference was the chip's software.

I simply found someone that had the newer computer, copied the chip, and placed it in my old computer to resolve the issue.

FWIW

Willy