Component Inspection

1. Ignition Off.
2. Disconnect knock sensor connector.
3. Measure resistance between terminals 1 and 2 of the sensor connector (Component side).
   1. Specification: Approx. 5 MΩ at 20°C (68°F)
      Fig 1: Measuring Resistance Between Terminals 1 And 2 Of Sensor Connector (Component Side)

      

1. Remove knock sensor from vehicle and secure (across mounting boss) in a shop vise.
2. Set up an oscilloscope as follows: Channel A (+): terminal 1 (-): terminal 2
3. Rap on vise with a ball peen hammer while monitoring oscilloscope screen (there should be a spike of less than 1 volt with each hammer strike).
   1. Specification: knock sensor send a voltage spike with hammer strikes

1. Check the installation torque of the knock sensor.
   1. Specification: Approx. 16~28 N.m (160~250 kg.cm, 11.8~18.4 lb.ft)

YES

1. Check knock sensor for contamination, deterioration, or damage. Substitute with a known-good knock sensor and check for proper operation. If the problem is corrected, replace knock sensor and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

NO

1. Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.