Flashing Check engine light, no codes!

Hi!
I have a 1989 buick century with the 3.3/v-6. When trying to
retrieve trouble codes, the check engine light flashes about 3 blinks
per second and does not quit. The code 12 does not appear at all.

No readable codes, just the rapid blinking occurs. I am using a paper
clip to connect the data link(white w/black sripe) to the computer
ground(black w/white. With engine not running. :uhoh:

The car is fully loaded with a Brand new battery.

Thankyou for anything you can suggest.

Rod

I have a 1989 buick century with the 3.3/v-6.

Try posting over at the Buick forum... this is Chevy Blazer.

BTW- On a Blazer, you have to turn the key over to run position (NOT start) to get the codes to flash.

try Disconnecting batt for About 5 min. the put Key in connect batt, and tourn key to on not start. this should clear all existing codes and give you a fresh start. If that dosen't work take it to a "sun" mech.

Good Luck

The code 12 expected during code retreival is there for two reasons... one is to let you know that all is well, except that it is not receiving a tach signal, which would be expected if the engine is not running. The second is to advise you that is appears to be getting a signal, though none exists. I would look into power and ground getting to the ECM. It is possible for the ECM to be the source of the problems. Ray