Signal Circuit Inspection

Check voltage in harness
1. Ignition "OFF"
2. Disconnect IAT sensor connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 5 of IAT sensor harness connector and chassis ground.
  Specification: Approx. 5V
  
  Fig 1: Measuring Voltage Between Terminal 5 Of IAT Sensor Harness Connector And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
5. Is the measured voltage within specifications?
  Yes
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Go to "Check for short to ground in harness" as below.
Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect IAT sensor & PCM connector.
3. Measure resistance between terminal 5 of IAT sensor harness connector and chassis ground.
  Specification: Infinite
  
  Fig 2: Measuring Resistance Between Terminal 5 Of IAT Sensor Harness Connector And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured resistance within specifications?
  Yes
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Check for short to ground in signal harness.
  - Repair or replace as necessary. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.