Signal Circuit Inspection

IG "OFF" and disconnect IATS connector.
IG "ON".
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 CO.
Is the measured voltage within specification?
YES
- Go to "GROUND CIRCUIT INSPECTION " procedure.
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.

IG "OFF" and disconnect IATS connector and ECM connector.
Measure resistance between signal terminal of IATS harness connector and power terminal of MAFS harness connector.
Measure resistance between signal terminal of IATS harness connector and signal terminal of MAFS harness connector.
Specification: Infinite

Fig 2: Measuring Resistance Between Signal Terminal Of IATS Harness Connector And Power Terminal Of MAFS Harness Connector
Courtesy of HYUNDAI MOTOR CO.
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.

IG "OFF" and disconnect IATS connector and ECM connector.
Measure resistance between signal terminal of IATS harness connector and IATS signal terminal of ECM harness connector.
Specification: below 1Ω

Fig 3: Measuring Resistance Between Signal Terminal Of IATS Harness Connector And IATS Signal Terminal Of ECM Harness Connector
Courtesy of HYUNDAI MOTOR CO.
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.