Component Inspection

Component resistance inspection
1. Measure resistance between terminals 1 and 2 of the sensor connector (Component side)
  Specification: Approx. 5MΩ at 20°C (68°F)
  
  Fig 1: Measuring Resistance Between Terminals 1 And 2 Of Sensor Connector
  Courtesy of HYUNDAI MOTOR CO.
2. Output signal inspection
  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).
  Specification: knock sensor send a voltage spike with hammer strikes
3. Installation torque inspection
  1. Check the installation torque of the knock sensor.
  Specification: Approx. 16 ~ 28N.m (160~250 kg.cm,11.8~18.4 lb.ft)
4. Has a problem been found?
  YES
  - Check knock sensor for contamination, deterioration, or damage. Substitute with a known-good sensor and check for proper operation. If the problem is corrected, replace sensor and then go to "VERIFICATION OF VEHICLE REPAIR " procedure
  NO
  - 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