Signal Circuit Inspection

Check voltage
1. IG "OFF" and disconnect IATS connector.
2. IG "ON" and ENG "OFF"
3. Measure voltage between terminal 4 of IATS harness connector and chassis ground.
  Specification : Approx. 5V
  
  Fig 1: Measuring Voltage Between Terminal 4 Of IATS Harness Connector And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured voltage within specification ?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - If the voltage is 0V, go to 3"Check open in harness" as follows. If the voltage is more than 5.1V, go to 2"Check short to battery in harness" as follows.
Check short to battery in harness
1. IG "OFF" and disconnect IATS connector and PCM connector.
2. Measure resistance between terminals 2 and 4 of IATS harness connector.
3. Measure resistance between terminals 1 and 4 of IATS harness connector.
  Specification : Infinite
  
  Fig 2: Measuring Resistance Between Terminals Of IATS Harness Connector
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured resistance within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair short to battery in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check open in harness
1. IG "OFF" and disconnect IATS connector and PCM connector.
2. Measure resistance between terminal 4 of IATS harness connector and 44 of PCM harness connector (C144-A).
  Specification : below 1Ω
  
  Fig 3: Measuring Resistance Between Terminal 4 Of IATS Harness Connector And 44 Of PCM Harness Connector (C144-A)
  Courtesy of KIA MOTORS AMERICA, INC.
3. Is the measured resistance within specification?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - Repair open in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.