Ground Circuit Inspection

When the ground line is open, PCM assumes the air temperature as -39°C and outputs 5 V.

1. Ignition "OFF"
2. Disconnect IAT sensor connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage or resistance between terminal 4 of sensor harness connector and chassis ground.

   Specification: below 0.5V or below 1Ω

   Fig 1: Measuring Resistance Between Terminal 4 Of Sensor Harness Connector And Chassis Ground

   Courtesy of HYUNDAI MOTOR CO.
5. Is measure voltage or resistance within Specification?

   YES 

   • Go to "COMPONENT INSPECTION " procedure.

   NO 

   • Open circuit between IATS harness connector and PCM harness connector.
   • Open circuit between PCM harness connector and chassis ground.
   • Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
     NOTE: In case, when checking open ground circuit, the resistance is infinite.

     • Possible cause: Open or short between terminal 36 of PCM and Terminal 4 of IATS.