Reading Codes - Page 3 - PeachParts Mercedes-Benz Forum

JimF · #1 08-07-2003, 11:38 AM

Here's what my DTC Manual says for your DTCs.

Pin 6: ABS
13 - Brake Lamp Switch
25 - Left front vehicle speed sensors
26 - Right front vehicle speed sensors

Pin 7: EA
7 - CAN data bus signal from EA, ABS, LH-SFI control module faulty
11- Closed Throttle recognition signal to engine control module, LH-SFI. Fuel safety shut-off to engine control module, LH-SFI

Pin 8: Base Module
9 - Voltage supply for LH-SFI control module interrupted
10 - Same as above plus voltage supply for fuel-injectors interrupted
11 - Voltage supply for accessory equipment control module interrupted.
12 - Voltage supply for ABS or ABS/ASR or ASD control modules interrupted.
13 - NOT USED ???

Pin 30: SRS
4 - Right front ETR squib

Interesting codes! I quess you had no codes in the other modules since you didn't post any other module?

The SRS is a DIGITAL module so surprised you got codes from it.

Convience Features are reserved for the '140' car, so don't know what that pin is??? Are you sure it's '30'??

How's your wiring harness???

I would reset all of the codes and then see what comes back in a few days.

wjm · #2 08-07-2003, 11:48 AM

Jim,

Those were the only pins that returned a code.

I started putting together a worksheet of codes. First page has all of the readable pin locations and subsequent pages have codes for each pin.

I'm making my list using your site and comparing it to what alldata shows. I guess i'll check my CDs as well. There indeed are some subtle differences between your codes (which I assume are for the 140) and the 124. I'll be more than happy to send you the excel spreadsheet once I'm done.

Yes, I did get a 4 from Pin 30. And, it make sense... as I did take out my airbag recently to change the aspirator motor.

Again, my 94 E420 does indeed have the convenience feature module (I believe below the rear seat on driver side).... so why would I not be able to get codes out of it? Are codes only generated out of that module for a 140?

Also, I wonder if speed sensors codes are being generated because I replaced my wheels/tires with slightly larger ones?

BTW... harness was replaced in January , 2001

I will reset all of the codes and try again in a few days.

FUN STUFF FOLKS!!!

wjm · #3 08-07-2003, 01:45 PM

I just checked my 38 pin connector. Many of the pins don't have any contacts in them. Here are the 13 that do:

1,2,3,4,6,7,8,13,14,16,17,19,30

1-Ground
2-Voltage, circuit 87 or circuit 15z
3-Voltage, circuit 30
4-LH sequential multiport fuel injection, Engines 104,119
6-Anti-lock brake system, Electronic traction system, Acceleration slip regulation, Electronic stability program
7-Electronic accelerator, Cruise control/idle speed control
8-Base module, Brake assist
13-TNA-signal (gasoline), LH-SFI engines
14-On-off ratio, Engine 119 LH-SFI, Engine 120 LH-SFI (right)
16-Air conditioning, Models 124, 140, 202, 208, 210
17-Distributor ignition, Engines 104, 119, Engine 120 (right)
19-Diagnostic module (USA)
30-Airbag/ETR (SRS)

Of those (excluding 1-3 which are ground and voltages), only 2 have no matching DTC table (13 and 14). Does anyone know those are monitored?

Also interesting is that I don't have a pin in 23 which is supposed to monitor the Anti-Theft Alarm System. Any clues?

wjm · #4 08-07-2003, 05:04 PM

OK, According to ALLDATA (well.. a posted Mercedes Service Bulletin), looks like #14 is used for lambda reading.

When I hooked up my DIY LED reader's test plug to #14 (with black in #1 and red in #3), the LED lit up without even pushing the button. This tells me that it was an active ground. Needless to say, I did not push the button, as I was afraid of shorting something out.

Still trying to find out what #13 is used for. Anyone? Description is TNA-signal (gasoline), LH-SFI engines. I get no return signal with my DIY LED tool.

JimF · #5 08-07-2003, 09:04 PM

done a pin mapping of X11/4 and that's why you said your car had CF (pin 21). So I quess you hadn't.

See my page, MENU#4 re Lambda testing. I have the M0039 meter and use it measure the car's lambda. But you can accomplish this testing with any meter that has duty cycle. Others have used a Fluke meter: do a search and you'll find alot of info on it.

wjm · #6 08-08-2003, 09:58 AM

Jim,

Again, my vehicle has a convenience module as I have one-touch window rolldown and all window rollup on door locking (while holding key). Evidently, though, it is not readable on my car as there is no contact at pin #21. So, that issue is now closed.

As you suggested, I read your article #4 but am still unsure how lambda is read on my vehicle,

I don't believe I have an X11 in my car. I do have a duty cycle capable multimeter. Can I assume that Lambda is read using pins #13 "TNA" and #14 "On-Off Ratio" from the X11/4? If so, which probe goes to which pin?

Once I verify this, I should be able to use the info on your #4 page.

Thanks!

JimF · #7 08-08-2003, 11:30 AM

data 'sheet' on the X11 connector and M0039 Lambda tester. If you have an X11, it should be located near the DI module on the left fender.

Pin 2 (grnd), Pin 3 (O2 sensor) and pin 6 (12V) are the needed signals. So a Fluke w/ d/c should work ok!

wjm · #8 08-08-2003, 12:22 PM

Thanks Jim,

Quote:

Pin 2 (grnd), Pin 3 (O2 sensor) and pin 6 (12V) are the needed signals.

I know this is stupid, but how do you connect a multimeter to 3 pins?

I'm at work now (on a Unix Box) so I can't open the attachment at the moment.

Suppose I dont have an X11.. what then? Can I use the duty cycle multimeter to measure lambda using pins 13 and 14? Is there a 3rd pin need?

JimF · #9 08-08-2003, 12:46 PM

multimeter (MM), connect the MM 'minus' (blk) lead to ground and the 'plus' (red) to pin #3 (O2 sensor) for the X11 connector.

For the X11/4 connector, pin 14 to MM 'plus' and pin 1 to MM 'minus'.

The other pins are there for the Mercedes HHT or the M0039 which needs 12V and Ground to power it.

wjm · #10 08-08-2003, 01:55 PM

OK, I'll test it out today.

So the only question left is ... What is pins #13 "TNA" for and how is it read?

I plan to document all of this info.... although this thread will still be here.

wjm · #11 08-08-2003, 03:06 PM

OK,

Using multimeter with Duty cycle setting, connected black to pin 1 and red to pin 13. Air off and ignition on (engine off). Got 49.9%. THen started engine and tested at idle. Got 49.9% again.

JimF · #12 08-08-2003, 05:15 PM

warm up and you should see an 'oscillating' 50% duty cycle showing the 'lambda' system is active.

Looks good!

wjm · #13 08-08-2003, 06:24 PM

Jim,

Car was at full temp when tests were performed. I had just gotten back from work and kept the engine running while I went in to get my multimeter.... So it was well over 80degC.

Also... FYI...

Quote:

REF.NO.: MBNA 07.4/1, 58/74

DATE: April 1994
TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
SUBJECT: MODELS 124, 129, 140 WITH ENGINES 119/120 LH-SFI ELIMINATION OF 9-POLE DIAGNOSTIC CONNECTOR (X11) AND TDC SENSOR (L1)

As of July 1993 production, the 9-pole diagnostic connector (X11) and TDC sensor (L1) have been eliminated from the engine compartment on the above-mentioned vehicles.
Note :On engine 120, there is a left and right diagnostic connector and corresponding TDC sensor (X11/2, X11/3, L1/1, L1/2, respectively).
Due to the elimination of the 9-pole diagnostic connector from the engine compartment, an adaptor cable must now be used to replicate this function and supply the needed signals (connectors "A" and "B") from the ignition control modules (N1/3, N1/4, N1/5) and 38-pole data link connector (X11/4) (Figure 1). As a result, an engine analyzer can still be used for diagnostic purposes.

The Lambda output signal has been incorporated in to the 38-pole diagnostic connector (X11/4). The signal can be read using the engine analyzer or the Lambda meter via the adaptor, using socket 14 (engine 119) or sockets 14 and 15 (engine 120) of the 38-pole data link connector (X11/4), (Figure 1) or with the Hand-Held Tester (HHT).

Due to the elimination of the TDC sensor (L1), the ignition angle must be verified with the HHT, or a strobe light can be used if necessary.

Diagnostic test connections are included with the adaptor and are to be followed accordingly.
Note :When using the Bear Dace engine analyzer, 2 adaptor cables will be necessary for diagnosis on engine 120. In addition, it is considered normal if the - 200 icon flashes on the Bear Dace engine analyzer, since this signal is not in the adapter cable socket.

Order No. S-SI-MBNA-07.4/1-58/74

Anyone out there have info on PIN 13?

Thanks

Joseph_H · #14 08-17-2003, 02:46 PM

it works GREAT!

I tested all the modules available for my car in the 38-pin socket and didn't get DTCs (all came back with 1 flash). However when testing pin 30 (SRS module) the LED behaved weird:
Plugged Black in Pin#1, Red in pin#3 for Gnd and power respectively. Yellow in socket pin #30 (SRS) and pressed PB for 2-3 secs LED is ON and released PB. LED stayed on for about 1 sec then went OFF. No status reported... Not sure what that means? Any ideas?