Knock Sensor: Inspection

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

KNOCK CONTROL SENSOR
1. Using an ohmmeter, measure the resistance between the terminals.
  
  Fig 1: Measuring Resistance Between Terminals Using Ohmmeter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Resistance:
  
  120 to 280 kΩ at 20°C (68°F)
  
  If the resistance is not specified, replace the sensor.