93 Blazer 4.3 Error Code 43 Help

I have a 93 Blazer 4wd with a 4.3 vortec that has the service engine light on. I read it with my code reader and got a

code 43 Electronic Spark Control Failure

Does anyone know what this is or where I should start?


Thanks

Code 43 shows in my 93 service manual as a knock sensor error. I have never worked on these(you have two of them) so I am unable to advise much but appears you will have to check the circuit for broken ground etc. and possibly replace both units. Maybe others can advise further on this as I simply have not dealt with it. The first one is located behind the passenger side head, might be a pain to deal with, and the other is under the driver side head, about midway. They are connected together by a wire. Might want to invest in a Haynes manual, or, again a lot of these folks are superior mechanics so you might get further advice to help you out.

The Knock Sensor connector on my '92 was so fragile it broke all to pieces when I bumped it with my spark plug socket on a plug change.
To fix, I removed the broken connector pieces, used 1" a very small diameter piece of vacuum hose to hold the wire stub then a 1" piece of bigger dia. vac. hose to hold the previous mentenioned pieces inside a 3rd larger piece that fits the sensor itself...been working fine a few years now.

http://i131.photobucket.com/albums/p288/Clunk_/Image012.jpg