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Old 04-30-2006, 09:34 PM
BDBENZ's Avatar
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Join Date: Jul 2002
Location: Columbus, OH
Posts: 197
Reading Codes

Question: Can you pull fault codes on a 1993 300E with the 2.8 104 engine. I have the 16 pin connector but it does not have the built in LED. I made the homemade code reader but all that I get when I activate the button is a solid red light from the led, no flashes. Before I kept trying I what to make sure that you can read the codes on this model. Thanks,


87 560 SL
93 300E 2.8
91 300CE-24
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Old 05-01-2006, 09:45 AM
skiier3_9's Avatar
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Join Date: Jan 2005
Location: Minnesota
Posts: 975
Yes you can read codes on the 300e 2.8
you should use the homemade tool as follows:

connect the black wire to pin 1 (ground)
connect the red wire to pin 16 (+12 V)
connect the 3rd lead to any of the other diganostic pins (3, 6, 8, 14...)
--It appears that you've done this correctly since the LED is on

To read codes: (With the ignition ON but engine off - all the gauge lights will be on)
1. press and hold the switch for 2 - 3 seconds
2. release switch and count the number of blinks of the LED
--this number is the code
3. repeat until you get the first code again (it cycles through in numerical order)

To reset codes:
1. read the code as above
2. hold the switch down for 8 - 10 seconds

each code must be read and cleared individually

Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE
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