Signal Circuit Inspection

■ Check voltage 

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

   Specification:  Approx. 3.3V

4. 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" below. 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". 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

4. Is the measured resistance within specification?

   YES 

   • Go to "COMPONENT INSPECTION " procedure.

   NO 

   • Repair short to battery in harness. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Check open in harness 

1. IG "OFF". 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 1Ω

3. Is the measured resistance within specification?

   YES 

   • Go to "GROUND CIRCUIT INSPECTION " procedure.

   NO 

   • Repair open in harness. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.