What is a code 43 for a chevy 4.3 engine?

My book says its the module or the knock sensor, the module isnt recieving info from the knock sensor so either the knock sensor is bad or the module or a wire in between, most likely the module I used to have an 84 S10 and I dont remember setting the timing to TDC is that the spec? I'll star you and check on you sometime so let us know how it goes