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Dave Nova
Dave Nova, Buick Technician
Category: Buick
Satisfied Customers: 1808
Experience:  ASE Master Certification. GM World Class Certification
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1994 Roadmaster OBD! will not flash codes or when connected

Customer Question

1994 Roadmaster OBD! will not flash codes or when connected to a scanner
Submitted: 1 year ago.
Category: Buick
Expert:  Jerry replied 1 year ago.

Hello and welcome. My name is ***** ***** you for visiting the site.


Is there a good ground connection at the "A" terminal of the data link connector?


Are the fuses good?

Expert:  Jerry replied 1 year ago.

It shows that you are waiting for me. Let me send this as a test. Thanks

Customer: replied 1 year ago.
first things checked.
Customer: replied 1 year ago.
The service engine light will go on when first turning on and goes out after engine start and if I disconnect say the Mass air flow sensor or Any other sensor the light will go on and stay on till connected again.
Customer: replied 1 year ago.
My engine has a miss after warm up but runs fine when first started thats what got me checking every sensor with a meter but could not find trouble with the readings.
Customer: replied 1 year ago.
I have talked to GM mechanics to no avail.
Customer: replied 1 year ago.
I have been working on cars for 50 years and never have encountered a problem with the electronics has this.
Customer: replied 1 year ago.
I have replaced the coil, the ECM and mass airflow sensor which I thought was the problem .
Expert:  Jerry replied 1 year ago.

I see, thanks.


I must have missed all that. I will opt out and open it back up. Please DON’T REPLY to this post as that will lock the question back to me, someone should be along shortly, I’m sure, thanks and sorry I wasn’t able to help with it.

Expert:  Mike S. replied 1 year ago.

Are you forgetting to turn the key to run, after touching together A and B in the diagnostic connector?

If so, can you tell me which ones you are relying on are A and B?

You may have a faulty coolant temperature sensor.

Customer: replied 1 year ago.
Apparently you have no solution . Please refund my account , I will try to get an answer from another place and keep trying things for myself.
Expert:  Mike S. replied 1 year ago.

What are you talking about?

I asked you 2 questions and you come back with I have no solution/

You didn't even answer my questions!