Signal Circuit Inspection

Check Open or Short in signal circuit
1. IG "OFF".
2. Disconnect IATS connector.
3. IG "ON" & ENG "OFF".
4. Measure the voltage between signal terminal of IATS harness connector and chassis ground.
  Specification: Approx. 3.3V
5. Is the measured resistance within specification?
  YES
  - Go to " 2Check Short to ground in signal circuit" procedure.
  NO
  - Repair or replace as necessary and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check Short to ground in signal circuit
1. IG "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 voltage within specification?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure
  NO
  - Repair or replace as necessary and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.