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Mike V.
Mike V., Nissan Technician
Category: Nissan
Satisfied Customers: 23804
Experience:  Nissan factory trained and Certified Subaru Technician.
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200 Nissan Altima: scanner..service engine..ecu pin-out diagram shows

Resolved Question:

I have a 200 Nissan Altima that when connected to an OBD-II scanner displays a data link error. The car barely runs with little power and both the service engine and security lights are on. The ECU pin-out diagram shows no pins for the DLC. I assume I have bad interface between the DLC and ECU. Can anyone advise me of the DLC pin locations so they can be tested or of any other likely cause for the noted symptoms?
Submitted: 5 years ago.
Category: Nissan
Expert:  Mike V. replied 5 years ago.
GreetingsCustomerand welcome to JA! I will do my very best to assist you with your problem.
HI there! So it will power up the scanner,just won't read?
Customer: replied 5 years ago.
Initially after replacing ECU, it still did not start until after ECU was reprogramed and a couple of bad connections were repaired. Thereafter, it finally starts hard and runs rough with little power but can be driven.
Expert:  Mike V. replied 5 years ago.
Ok, but at the moment does the scan tool power up when you plug it in?
Customer: replied 5 years ago.
yes the scanner powers up with the error message saying data link error
Expert:  Mike V. replied 5 years ago.
Ok, you have to ohm the data link wire.
This is pin # XXXXX on the obd II connector, and pin 59 on the ecm.
graphicgraphic
If the wire has continuity, then it is likely still an issue with the ecm.
Also, check the fuse box, some of these had a grey data link connector, rectangular in shape. If it has that, then you have to use an adapter and get the info from there. The OBDII port didn't work for all. I just can't remember what year they switched, so check it out.
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