Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

Closed Thread
LinkBack Thread Tools Display Modes
Old 08-04-1999, 01:39 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, 06:40 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, 07:26 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, 07:39 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, 10:04 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).]
Closed Thread


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
'91 300E 3.0 check engine light, code 17, after 02 sensor replacement kristian85 Tech Help 1 07-16-2004 11:40 AM
Fault code 13 - Lambda control at limit 95e320 Tech Help 23 09-30-2003 03:32 PM
Fault Code 18 for E420 dr_ed Tech Help 2 08-03-2003 10:46 PM
'97 C230, Fault Code P0170 and Self Adaptation jgl1 Tech Help 1 06-03-2003 08:02 AM
300E Fuel Injection Fault Code 60 Tech Help 6 03-13-1999 03:34 PM

All times are GMT -4. The time now is 11:44 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page