Signal Circuit Inspection

■ Check Open or Short in Signal Circuit 

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

   Specification:  Approx. 5V

5. Is the measured voltage within specification?

   YES 

   • Go to "Check Short to Ground in Harness " as follows.

   NO 

   • Check for Open or Short in signal circuit. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Check Short to Ground in Signal Circuit 

1. IG KEY "OFF".
2. Disconnect IATS and ECM connector.
3. Measure resistance between signal and ground terminal of IATS harness connector.

   Specification:  Infinite

4. Is the measured resistance within specification?

   YES 

   • Go to "GROUND CIRCUIT INSPECTION " procedure.

   NO 

   • Check for short to ground in signal circuit. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.