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