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Old 07-12-2001, 07:52 PM
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In my manual, it shows two tools. One that reads pulse-
codes, the other that reads on/off percents (a meter).

Can I fab both of these? The code reader looks like
an LED, switch and resistor (if I had the schematic)
simply wired in a fancy box. The on/off reader a plain
voltmeter (12v scale?) What functions are the pins in
the X-92 and X-11 connectors?

Or if they are inexpensive (riiiight!) can I buy them
from MB or after market?

Bob Hoenes
1989 Artic snow White 300E

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Old 07-12-2001, 08:23 PM
JimF's Avatar
'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,924
The on/off ratio (lambda) tester can be purchased from the following link:

The FAULT CODE COUNTER (124-1921) can be had by making one yourself or buying one from this link:

Also read Steve's article in the DIY section.
Regards . . . . JimF
'94 S500 Cpe

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Old 07-12-2001, 09:17 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
I sent the schematic to the addy.
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Old 07-14-2001, 04:51 PM
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The "on/off ratio" as you call it is called duty cycle. You can buy a digital voltmeter with a duty cycle function at Sears for 29.95. I happen to be in on a 10% off all Craftemen tools day and bought it for even less. It works great.

Most likely you will connect and find a 50% duty cycle. There are only a few other codes which may be trapped.

The pulsed codes are only on California vehicles for the models you listed.

Have a great day,
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Old 07-14-2001, 05:06 PM
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Pin Connections X-92 and X11.

In the X-92 connector, my 300E only has pins 1, 6 & 7.
NO 2, 3, 4, 5 or 8 (empty holes/no wires!) Where does
the code reader connect???

And on the X11, what scale do I use on the duty-cycle
voltmeter, and to which pins in the X11 do I connect it???

(East coast MB 300E)
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Old 07-14-2001, 06:51 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Have you read the article in DIY?

I don't know about the X92 connector. The two possible diagnostic sockets are X11 and X11/4 I think (being without diagram). The only one most cars from 86-90 is the one on the driver's fender.

In it, on pin# 3 the duty cycle (integrator) can be read. To ask which scale infers that you don't understand duty-cycle. It is a percentage.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 07-16-2001, 11:30 AM
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Codes Read

I read the DIY, and on a scope, duty-cycle is obvious.
But in a meter (modern-new-fangle-ones-with-chip) it can
do the area integration under the square wave, and print
out a percentage. But there still must be some max voltage,
less the meter becomes fried if it is hit w/ giga-volts.

Years ago w/ galvanic meters (iron core, needle stuff) we
could set the thing on a A/C scale, and the bridge inside
would integrate the areas under the curve for the + and -
voltage swings. If the cycling was fast enough you would
get a ratio, and a needle swing. But if it is a wave from
(say 0 to 12v dc) then this Rube-Goldberg will not work,
and you truly need the new (intellegent) meters, or a good
old fashion O'scope.

And I did put an LED across a pin in X-92 and read a code
of "12". But my Chilton book only has codes for the M103
engine to 10. Is there a list of codes somewhere within
this MercedesShop, or Forum????

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Old 07-16-2001, 03:09 PM
Posts: n/a
Lambda Adjustment

Brothers of The Benz,
If you read the Service manual you will note an option value.
It is degrees in dwell.(21-27 degrees dwell)
Using a points ignition dwell meter you can establish the mixture control for the proper O2 voltage and smooth idle.
It's in The Book.
Service Manual, Engine 103
Section 7.3
Job 100/2
Happy Trails Beep Beep from The Spiderman in Houston!!!
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