Edge, MKX 2007

Knock Sensor



The Knock Sensor (KS) is used to detect engine detonation. It sends a voltage signal to the PCM. The knock sensor is able to provide a signal, which retards the ignition timing, as necessary.

Removal & Installation

  1. Remove the thermostat housing. Refer to the Thermostat procedure in the Engine Mechanical Section.
  3. Remove the lower intake manifold, as outlined in the Engine Mechanical Section
  5. Remove the coolant tube. Discard the O-ring.
  7. Disconnect the Knock Sensor (KS) electrical connector.
  9. Remove the 2 bolts and the KS.

    Click image to see an enlarged view

    Fig. **REREF** Exploded view of the Knock Sensor (KS)


To install:

  1. Installation is the reverse of the removal procedure, noting the following:
    1. Lubricate the new O-ring with clean engine coolant before installing it.
    3. Tighten the KS bolts to 20 Nm (15 lb-ft).



Appropriate repair methods and procedures are essential for the safe, reliable operation of all motor vehicles, as well as the personal safety of the individual doing the work. This procedure provides general directions for repairing vehicles with tested, effective techniques. Following them helps to establish reliability. There are numerous variations in procedures, techniques, tools, and parts for repairing vehicles, as well as in the skill of the individual doing the work. This manual cannot possibly anticipate all such variations and provide advice or cautions as to each. Accordingly, anyone who departs from the instructions provided in this procedure must first establish that they compromise neither their personal safety nor the vehicle integrity by their choice of methods, tools, or parts.

  1. Make sure the Knock Sensor (KS) is installed properly.
  3. Disconnect the KS harness connector and measure the resistance between KS + and KS - on the component side. The resistance should read between 4.39-5.35 megaohms. If resistance reading is not within specifications suspect a faulty KS.

    Click image to see an enlarged view

    Fig. Knock Sensor (KS) connector view-1: KS1+, 2: KS1-