I checked the box and all the sw/led is ok, now some times when I am driving say 50 miles and the street is smooth i feel with a vibration in the hole car.
thanks so much for your help

 

You checked the box and the sw/led is OK?
What does that mean?
Does the 16 connector box HAVE a sw/led at pins 2 and 4 ?????
That is the question.
Then I can tell you how tro go get the stored fault codes.

 

yes, the 16 connector box HAVE a sw/led at pins 2 and 4

 

Thank You!

Turn key ON to run position
Press sw and hold for 2-3 secs
Release sw..led will respond with flashes..count them and repeat until no more flash codes and report findings

 

Sorry I miss understand from the begining, the box got 16 pins all of them are in their positions I ckecked that, so what sw/led means

 

OK

In pin # 2 position.. is there a little button there ?
If so, that is what sw means . it is a push button switch
In pin 4 , do you see a little led lamp?
That is what led means.

You push the sw and the led should light up
Do you have these features????
If you do, you can get codes
BUT , some models of the same year do NOT have this feature ..that is what you have to tell me before I send you on a wild goose chase...

 

no I dont have any sw or lead in position 2 and 4

 

OK
You have the Federal , non emissions OBD diagnostics system
This system does not use a Check Engine light on the dash [ whick is why yours does not come on]
You can still get diagnostic fault codes from your chassis by building a simple $5 retrieve led/sw tool.
Here is one I make up for this purpose
If you are handy, make one and I will tell you how to get any stored fault codes from the 16 pin diagnostic access box.

http://members.aol.com/ajdalton7/ledtool.jpg

 

I made one

 

OK
What color leads did you use?