Signal Circuit Inspection

Check voltage
1. IG "OFF" and disconnect IATS connector.
2. IG "ON" & ENG "OFF"
3. Measure voltage between terminal 4 of IATS harness connector and chassis ground.
  Specification: Approx. 5V
4. Is the measured voltage within specification ?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Go to 2 "Check short to ground in harness" procedure.
Check short to ground in harness
1. IG "OFF" and disconnect IATS connector and PCM connector.
2. Measure resistance between terminal 4 of IATS harness connector and chassis ground.
3. Measure resistance between terminals 4 and 5 of IATS harness connector.
4. Measure resistance between terminals 4 and 3 of IATS harness connector.
  Specification: Infinite
5. Is the measured resistance within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair short to ground in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.