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I have a 91 S10 Blaser 4.3 AT. I have been getting intermittant SES. I tried to get it to flash trouble codes by jumping the upper right most 2 pins(A,B) on the ALDL plug. It doesn't flash anything, not even code 12. ????

I do know I currently have a speed sensor signal problem because my speedo isn't working and the brake warning light is on. I haven't been able to isolate this yet.
 

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Does the ck eng lite come on when you first turn the key on ? I've had this
problem on two rides. It ended up being the ECM both times. Not saying
this is your problem, but I couldn't get codes either. When I would hook
up the DLC connector cable, the scanner wouldn't acknowledge data.

I think if you take it to an Autozone they'll scan it for free. It would be
interesting to see if they can pull data out of it. I'm assuming you have
the key on once you jump A&B..
 

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mine is not readin any codes either even after i just replaced the computer today so dont know if the ecm is a different computer or what because i got almost identical to him no speedo abs light and ses light
 
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