Component Inspection

WARNING: This page is about a different variant/trim than selected.

Component resistance inspection
1. Measure resistance between signal terminal and ground terminal of the sensor connector (Component side).
  Specification: Approx. 5MΩ at 20°C(68°F)
  
  Fig 1: Measuring Resistance Between Signal Terminal And Ground Terminal Of Sensor Connector (Component Side)
  Courtesy of HYUNDAI MOTOR AMERICA
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 (+): Signal terminal, (-): Ground terminal
  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
    
    Fig 2: Knock Sensor Circuit Diagram
    Courtesy of HYUNDAI MOTOR AMERICA
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 PCM 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.