Signal Circuit Inspection

■ Check voltage 

1. IG "OFF" and disconnect IATS connector.
2. IG "ON"
3. Measure voltage between signal terminal of IATS harness connector and chassis ground.

   Specification:  Approx. 5V

   Fig 1: Measuring Voltage Between Signal Terminal Of IATS Harness Connector And Chassis Ground

   Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured voltage within specification?

   YES 

   • Go to "Component Inspection " procedure below.

   NO 

   • Go to "Check short to ground in harness" procedure below.

■ Check short to ground in harness 

1. IG "OFF" and disconnect IATS connector and PCM connector.
2. Measure resistance between signal terminal of IATS harness connector and chassis ground. (Measurement "A")
3. Measure resistance between signal and ground terminals of IATS harness connector. (Measurement "B")
4. Measure resistance between signal terminal of IATS harness connector and ground terminal of Baro Sensor harness connector. (Measurement "B")

   Specification:  Infinite

   Fig 2: Measuring Resistance Between Signal Terminal Of IATS Harness Connector And Chassis Ground (Measurement A)

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 3: Measuring Resistance Between Signal And Ground Terminals Of IATS Harness Connector (Measurement B)

   Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured resistance within specification?

   YES 

   • Go to "Component Inspection " procedure.

   NO 

   • Repair short to ground in harness and go to "Verification of Vehicle Repair " procedure.