Got it.

I find that I have to hold mine for about 4 seconds before reading codes.

Who knows... maybe there was a change between model years... but I really doubt it.

I tested for codes last night after a long weekend trip and no codes have popped up. #30 works just like all of the others.

Willy

For extra help..
 

here is a picture of the X11/4 38-pin Diag Socket with active pins for my '95 E420 similar to what Willy found on his '94 E420. Also see more pictures below for related items.

Great picture!
 

Can't quite read the insert box. Do you have it in a more legible form?? Will post it on my page if ok.

Re SRS: It's a digital system in both '94 and '95 for 129s, 140s and 124s according to my sources.

Jim,

Yea, I'd like to get to the bottom of the SRS pin. I swear I got a code #4 on that pin.

I have a much clearer picture Jim but...
 

.. due to forum's file attachment limitations i had to cut down the resolution/size (~50k). I'll email you the photo file tomorrow (~110k) to post to your site with pleasure.

Clrear picture with Pin-Assigments
 

Here are the pin assigments for the 38-pin socket from a '95 E420

Picture of the F-23 Computer Hosuing
 

attached below. You can see the 38-pin X11/4 diag socket and 4 modules in mine: from right to left:
LH-SFI module, DI Module, ABS Module, Base Module

Picture of X11/21 LED/PB Test Module
 

Pin 2 is the Push Button and Pin 4 is the LED

Not quite . . .
 

Joseph, it's "right to left" . . . also it's "LH-SFI"; need a little editing.

Thanks for corrections Jim..
 

I knew I should've had my AM coffee first... corrections are made.

It is amazing that with all the info posted here and on Alldata, I still am not clear on the meaning of the codes.

My '95 E320 wagon has, of course, the 11/4 connector, the version of which, according to Alldata is for a California car, though I know this one was purchased in Atlanta.

Anyway, pin 2 is a pushbutton, Pin 4 is an LED. When I use the pushbutton to read codes, I get codes 2 and 26, which I have not been able to erase (I get the same codes when I use my Impulse Counter gadget...can't erase them with that either).

Could someone tell me what these mean or point me to info on the forum or Alldata?

The only other code I got was a code 8 on pin 6 which, if I'm reading Alldata correctly, is an airbag code. that one I was able to erase. So I'll see if it comes back.

Thanks for the help.

Allan

PS: Is there another plug that I can use the Impulse Counter on for this car...there is mention in various posts of a round plug with 30 odd pins?

Codes for your . . . .
 

'95 E320 Diag Module (pin 3) are:

DTC# PCOF
------ -------
1 No Fault Found
2 Heated oxygen sensor faulty
3 Lambda control faulty
4 Air injection system faulty hot film mass air flow sensor with hot wire
5 Exhaust gas recirculation faulty
6 Idle speed control faulty
7 Ignition system faulty
8 Engine coolant temperature sensor open circuit
9 Intake air temperature sensor, open circuit
10 Voltage at mass air sensor too high/low
11 Tn-signal (rpm signal ) at engine control module faulty
12 Heated oxygen sensor heater circuit open or circuit short
15 Injector, cylinder 2
16 Closed throttle position information faulty
17 Data exchange malfunction between individual control module
18 Adjustable camshaft timing solenoid circuit open or circuit short
19 Injectors circuit open or circuit short emission control module adaptation in engine
control module at limit
20 Vehicle speed signal not present
21 Purge switchover valve circuit open or circuit short
22 Crankshaft position sensor signal faulty
23 Intake manifold pressure (in base module pressure sensor-) with engine running too
high/low.
24 Starter ring gear segments and /or crankshaft position sensor faulty
25 Knock sensors or engine control module faulty
26 Upshift delay faulty
27 Not used
28 Engine coolant temperature sensor (engine coolant temperature change monitor )
44 Not used
45 Fuel safety shut-off electronic accelerator or cruise control active
46 Resonance intake manifold switchover valve
47 Not used
48 Not used
49 Voltage supply at engine control module 8v
50 Engine control module

DTC 2: The O2 sensors have a rated life of about 60k so it might be time to changed it especially if the heater is gone.

DTC 26: Check for a vacuum leak, broken line, etc.

Jim,

Thanks for the information.

I've been screwing around with the Bowden cable and vacuum modulator so I'm not surprised at code 26.

How do I clear the codes? I did the usual drill...hold down for 8-10 seconds but doesn't clear them.

Again, thanks for your help.

Allan

Probably indicates that. . .
 

the faults are ACTIVE so can't be cleared. Had a similar problem with my ASR on my page ('www' icon below) and select Menu #24 for the similar problem.

Reading codes
 

What if any codes can be read on a 1989 260e. I assume that this is an analogue system. Can anybody verify this. Cannot seem to locate diagnostic socket of any kind. What should I be looking for. Seemed a lot easier on my 1995 S320. Had to sell it too costly to maintain. I now have a Trisco Palm Scanner looking to be plugged into something.