Signal Circuit Inspection

Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect IAT sensor connector and ECM connector.
3. Ignition "ON" & Engine "OFF"
4. Measure resistance between terminal 4 of sensor harness connector and chassis ground.
5. Measure resistance between terminal 3 and 4 of sensor harness connector
  Specification: infinite
  
  Fig 1: Measuring Resistance Between Terminal 3 And 4 Of Sensor Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
6. Is measure resistance within Specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Short circuit between IATS signal circuit and ground circuit.
  - Short chassis ground between IATS harness connector and PCM harness connector.
  - Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure