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  #1  
Old 02-05-2016, 05:58 PM
newbie
 
Join Date: Apr 2012
Posts: 464
Self test diagnostic module (16 pin) failure/not working

My 1994 E320 wagon have this self test diagnostic module (DM) 16-pin rectangular box located in front of the battery. The wagon works and drives fine with no check engine light on. Just to check the diagnostic module to see if there are any codes, I tried to push the button to give me codes. The red light was on when pressed and when I released the button after holding the button for 3 to 5 seconds, no flash or blinking codes. The same thing happen when I use the code reader as well. I even tried to use the HFM software scan and came up with no connections, either. Something is missing that is not producing the flash/blinking codes. I searched this forum and so far, I don't see any real issue with the self-test diagnostic module problems. The Over Protection Relay (OVP)is good, no broken fuses that I can think of. The wiring harness is good and not bio junk. Anyone have this problem? Feedback and/or comments is greatly appreciated. Thanks for reading.

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  #2  
Old 02-08-2016, 11:36 AM
Benz Mondi
 
Join Date: Nov 2006
Location: Sacramento area
Posts: 308
Confused?

Sorry, I'm confused by your description. When you depress the button and release it after 4 seconds, it should only blink once to let you know that all is well with the smog system. That is the only system that the push button checks. If it blinks more than once, note the number of times it blinked, repeat holding down the button for 4 seconds and see if the number of times it blinked changed. This tells you that there's another issue. If it only blinks once or it repeats the same number of blinks again, this tells you at the DC has completed it evaluation of that circuit.

To assess the condition of the other circuits, you must first look to see what holes have contacts in them to plug your reader pins into. Not every hole in the 16-pin has a contact which enables monitoring. In mine, I only have 3 holes with contacts. Repeat the same process with each new applicable hole. Remember, if it only blinks once, the DC is telling you that there are no issues with that circuit.

You said that your car runs fine. Why do you think that DC should be giving you any codes?
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  #3  
Old 02-12-2016, 07:42 PM
newbie
 
Join Date: Apr 2012
Posts: 464
Self test on board Diagnostic Module (DM) works now

Sorry for the delay due to the cold weather. The issue is resolved due to blown fuse number 7. I replaced the fuse number 7 and now the DM works. Yes, you are correct, the DM should blink once indicating all systems are fine. However, I did receive error codes 4, 5, and 21. After resetting the codes, I still receive codes 5 and 21.

Code 5 is Exhaust gas recirculation faulty.

Code 21 is Purge switchover valve circuit open or circuit short.

I need to research on the codes to try to resolve the issues. Thanks for your comments.

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