1994 E320 Wagon. CE light went on. Checked codes per previous posts. Got only code 20. Cleared code. CE light went off.

What is the Vehicle Speed Signal? Does this have anything to do with the speedometer? Mine works.

Does it relate to the Cruise control? Mine doesn't work.

Thanks,

Charlie

Does your speedometer and odometer work? If they are not working the cruise control won't work, and you will get the code 20. If they are working there's something more complicated going on.

What else could it be?

BTW, Wiring haress is one month old. Do you think it could be worn out already?

Pretty unlikely that the wiring harness has failed, but possible that there was some sort of installation issue. I would see if it comes back before devoting too much energy to it. If your speedo is getting the speed signal it is being properly originated and deliverered there but lost somewhere is the diagnostic system. You would really need to get your hands on a wiring diagram for your car to see where it is originated and where all it is routed.

You want to go to the EA/CC module to see what caused the code to get to the DM to trip the CE lamp.
Those codes are stored on pin #14 and accessible with a simple homemade led/sw tool...
Archives or http://members.aol.com/ajdalton7/ledtool.jpg

The code came back. The car still drives well, but I would love to know what is going on. I don't really want to take it on the road for a long trip until the light goes out.

I'm a little short on time, is there an off the shelf tool I can buy that will allow me to check the various codes? Is there still some kind of Sears tool? BTW, for some reason your sketch comes out very faint.

Thanks,

Charles

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yeah, Sears has scanners .. they start at about $300..
Just print the faint sketch....

I don't want to get in the way of all those who love to make a tool, but if one understands what is happening the impulse can be counted with a voltmeter or viewed with a scope as I wrote in the evaluating engine controls item in DIY.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Yes , those work and the SB article is a good read for anyone venturing this far .
The more you understand of these flash code systems , the easier they are ..

The led/sw tool is just a cheapo , convienient way to get there and is nothing more that a copy of the built-in led/sw circuit that comes with the car... if they had put a button on the other pins , you would not even need it... but ,they didn't , so we find a way..

Anyway , on the tool, I have made made a few and it is interesting how many different chassis members have put the circuit in.. from 35mm film cans
to Tik-Tak containers ..
Here is a favorite of mine made from a little cheapo flashlight that works well in the sun-light cuz the led is mounted in the lens reflector and nice and bright...

I know .. too much time on my hands ... b/g

http://members.aol.com/ajdalton7/dcp_0077.jpg

I built your device and I pulled the codes from pin 14. I got code 5. What does that mean?

BTW, I also tried pin 8 but I only got a single flash.

Thanks,

Charles

You have a bad stop lamp switch... common CC fault

Okay. But my brake lights do illuminate when I depress the brake pedal. But, I suppose the switch could still be defective.

Where can I get a list of the pin 14 and pin 8 codes? (I have the 16 pin, square interface.)

Thanks,

Charles

Brake light sw is a 4 terminal, dual seperate circuit, dual contactor set sw. Brake lamp activation /illumination does not eliminate a bad BL switch diagnosis.
Code 5 on Pin 14 [ EA/CC module ] is "Brake Lamp Switch"
I believe the other codes are in the archieves ...

Single flash on pin #8 [ HFM/SFI module ] is "No Codes Stored"
Single falsh on ANY module is NCS...

CEL Code 20.

I did the codes.

No brake switch today. That would be too easy.

Button - code 20

Pin 8 - 1 flash so okay

Pin 14 - Code 9 - Hall effect speed sensor - What's this?

Pin 6 (what is pin 6?) codes 4 and 9 that won't clear

So what now?

Please help. Arthur?

Code 9 on pin 14 is vehicle speed sensor...
B/6 hall sensor ... I believe that one is in the dash/speedo head..
There is a test connector under the hood somewhere .. I will see if I can find it in the CD

Does the car have ASR???

Further info:

Check fuse #1 . If OK , give it a spin for better contact
B6 speed sensor and S/9 brake lamp switch BOTH on this circuit, so that is a possible...

****CORRECTION .. That should read "Fuse # 5 "