1985 Fiero 2.5L, Automatic, California emissions. The check engine will not turn off even after disconnecting battery. It also doesn't show any codes.

[Bobwire]

The check engine will not turn off even after disconnecting battery. It also doesn't show any codes.

 

[melsg5]

have you used the paper clip method to check for OBD1 codes?

 

[G-18828]

Yes. No codes.

 

[Bobwire]

have you used the paper clip method to check for OBD1 codes? yes the check engine light is solid, never flashes. I disconnect battery and light comes right away

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[melsg5]

are you at least getting code 12?
if not the port is not working. Check for a blown fuse.

How to read older GM OBD diagnostic codes for free

 

[92 Sunbird LE]

Bad ecu......or bad prom.


Doug in P.R.