I've got a code 43 set indicating a problem with my knock sensor.

I haven't checked resistance yet, still looking for values, but I would expect to see 5ish VDC at the connector to the KS but instead have about 9 VDC.
Same 9 volts at ecm pin with connector disconnected. Battery is low but charging. All other sensors appear to be operating normally.

94 Chevy Blazer, 7427 ecm, BJLF.

Question is what is the proper DC voltage to knock sensor, and if it's not 9 what could be the problem/solution.
I look forward to your replies, thanks.