A knock sensor is a microphone bolted to the block. When the engine knocks, the sensor picks up the vibration and sends a voltage signal to the ECU, and the Elite can pull ignition timing to protect the engine. Knock sensors wire to the dedicated knock inputs on the ECU.
Haltech's diagram shows how the sensor connects to those inputs. You'll want it if you're adding knock sensors to a universal wire-in harness or retrofitting them to an engine that never had them. When wiring, check that each sensor goes to its own knock input, that the signal wire is kept away from ignition and injector wiring, and that the sensor is torqued to the block as its maker specifies.
Need this diagram? Ask us and we'll send it over with advice for your build.
Next steps: knock detection setup and what knock is and why to control it. A genuine Bosch knock sensor suits most installs.
