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
  - Go to step 2.
Check resistance.
1. Key "OFF".
2. Disconnect Knock sensor connector and ECM/PCM connector.
3. Measure the resistance between terminal 1 of knock sensor harness connector and 30 (32) of PCM (ECM) harness connector.
4. Measure the resistance between terminal 2 of knock sensor harness connector and 15 (11) of PCM (ECM) harness connector.
  Specification: Below approx. 1Ω
  
  Fig 2: Measuring Resistance Between Terminal 2 Of Knock Sensor Harness Connector And 15/C01-2 (11/C01) Of PCM (ECM) Harness Connector
  Courtesy of KIA MOTORS AMERICA, INC.
5. Is the measured resistance within specifications?
  YES
  - Repair Short to ground in signal circuit and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Repair Open in signal circuit and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.