Signal Circuit Inspection
- IG KEY "OFF".
- Disconnect IATS connector.
- IG KEY "ON" & ENG "OFF"
- Measure voltage between signal terminal of IATS harness connector and chassis ground.
Specification: Approx. 5V
- 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
- IG KEY "OFF".
- Disconnect IATS and ECM connector.
- Measure resistance between signal and ground terminal of IATS harness connector.
Specification: Infinite
- 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.