Signal Circuit Inspection

Check voltage.
1. Key "OFF".
2. Disconnect Knock sensor connector.
3. Key "ON".
4. Measure the voltage between terminal 1 of knock sensor harness connector and chassis ground.
5. Measure the voltage between terminal 2 of knock sensor harness connector and chassis ground.
  Specification: Approx 2.4V
  
  Fig 1: Measuring Voltage Between Terminal 2 Of Knock Sensor Harness Connector And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
6. Is the measured voltage within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair Short to power in signal circuit and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.