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Old 08-04-1999, 02:39 AM
Registered User
Join Date: Apr 1999
Location: Toronto, ON, Canada
Posts: 113

I have a 1988 300E (Canadian Version, i.e. no switch/LED at the diagnostic plug next to the battery) and my car is losing power. Everything has been changed (spark plugs/wires, O2 sensor) etc....

Still, no improvement. I would like to be able to read what fault code (if any) has been set in the computer (and to reset them). I've read that I can build a LED counter (which uses pin 1 and 3), however, pin 3 on the diagnostic plug (next to the battery) doesn't have anything in it (it's just a hole)....the pins that are available are pin 1, 6 and 7.

Any advice would be greatly appreciated.
Old 08-04-1999, 07:40 PM
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
You also can press the button right next #1
key on or engine running press button and hold 2~3 secods count how many blinks if blink three times (code #3) if blink 5 times
(code #5)......after you read all the code
or after repair is done press button again hold it for 8~10 seconds to reset check engine light.

MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner
Old 08-04-1999, 08:26 PM
Registered User
Join Date: Apr 1999
Location: Toronto, ON, Canada
Posts: 113
Thanks for your reply...However, I don't see any button/LED on the diagnostic plug....

Please help. Thanks.
Old 08-04-1999, 08:39 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Your car has the same fuel ECU as US cars. In 1988 there wasn't any hard codes stored in ECU. The only diagnosis is with Lamda meter (on/off ratio). If you get a fixed reading there is a fault. The computer is the least likely problem.
Old 08-04-1999, 11:04 PM
Registered User
Join Date: Apr 1999
Location: Toronto, ON, Canada
Posts: 113
Is there a way for me to measure the lambda with a multimeter? How do I know if it's ok? And it's not ok, how do I adjust it?

I've read from the mercedes mailing list that if the O2 is bad, the computer will put the car in a conservative/limb home mode (which is why the car is so slow, I suppose). When the computer is reset, the car will be back to normal, but the computer will be back in the conservative mode after about 20 mins - since the O2 hasn't been replaced yet. I've already replaced the O2 sensor, so, according to this theory, I should just reset the computer and the car will be back to normal, right?

Is there any truth to this theory?


[This message has been edited by E. Lee (edited 08-04-1999).]
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