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 "Ground Circuit Inspection " procedure below.

   NO 

   • If the voltage is 0V, go to "Check open in harness" as follows. If the voltage is more than 5.1V, go to "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 signal terminal of IATS harness connector and power terminal of Baro Sensor harness connector.
3. Measure resistance between signal terminal of IATS harness connector and signal terminal of Baro Sensor harness connector.

   Specification:  Infinite

   Fig 2: Measuring Resistance Between Signal Terminal Of IATS Harness Connector And Signal Terminal Of Baro Sensor Harness Connector

   Courtesy of HYUNDAI MOTOR AMERICA
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 signal terminal of IATS harness connector and IATS signal terminal of PCM harness connector.

   Specification:  below 1 Ω

   Fig 3: Measuring Resistance Between Signal Terminal Of IATS Harness Connector And IATS Signal Terminal Of PCM Harness Connector

   Courtesy of HYUNDAI MOTOR AMERICA
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.