Pontiac Problems? Ask a Mechanic for Answers ASAP
Hello I will help,
This port is not powered. You need power from the scanner to read codes.
Does the tool turn on without it plugged in?
Click here for a link to the owner's manual for the tool
Have you checked the batteries?
So the scanner does turn on? Do you have a generic OBD setting so you don't enter the VIN?
The OBD port does not have power, can you use a paperclip in the A and B pins of the port to short them then turn the key on and watch the check engine light for flash codes?
Page 90 of the manual explains the GM port
I understand that, nothing powers the port. The power is provided by the tool.
Can you try the paperclip in the A and B pin holes?
Do you know which they are? Don't guess.
Click here for diagram
Can you look at the diagram I posted above so you can see which are the A and B? Just click where it says "Click here"
Yes, a clear code will be output at the beginning and end of the code flashes.
Click here fo video
How about the last video I posted? What are you communicating on?
Can you see the text that says "Click here for video" in my post above? Click there.
Can you see the text in my post above?
No there is no link in that post, it says see the post above that one.
There are two links below that. One for a diagram of the port and one to a video of testing using the paperclip. Here they are again
Click here for video
It is past my bedtime so try to get it to flash codes, if it will there is nothing wrong in the port the problem is in the tool. I will look to see if you were successful tomorrow.
Good, let me know what you find, if it won't flash codes I can help you with that later.
There you have it then, either a wire is broken between the port and the computer, the light is burned out the computer is not powered up or the computer has failed.
I am unable to speak on the phone, we can continue here if you wish.
Do you have a voltmeter?
Does the check engine light come on with nothing in the port and you turn the key on?
Does the engine run?
OK, then you are going to have to check at the computer itself and ground the diagnostic wire, I will post a diagram of the location with the wire color.
For now ignore the scanner, it is in the way of the diagnosis, the paperclip is more direct.
You said you "repositioned" the paperclip. Did you probe any other pin sockets besides the A and B?
Measure the voltage between A and B, with key on you should see 3 - 6 volts with a digital meter. Do not be confused about that voltage, it is for diagnostic purposes only and does not power anything.;
I don't know what the scanner is doing, I don't use those. I do knopw that you need to be able to flash codes and you are not able to do that so lets find out why.
On the computer up behind the right side of the dash is a 32 pin yellow orange connector. You need to slide a straight pin along the white/black stripe wire to make contact inside the connector and run a wire to the pin and ground it. Turn the key on and see what the CEL does (check engine light). First measure for voltage between the A and B and if no voltage measure form the B to a clean ground.
Let me know what you find and how I can help
You are looking for pin D6, the view is the front of the connector and you are looking at the back (wire) side. Double check that by looking for the white/black stripe wire in the D6 slot. If you have the 3 - 6 volts at the diagnostic port you do not need to check at the computer.
Let me know what you find
Thanks for letting me know, I will be here when you have a chance to check it out so let me know what you find so we can get to the bottom of this
Good! don't know what is up with the scanner but at least you know the vehicle is operating normally.
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