Signal Circuit Inspection

Check voltage
1. IG "OFF" and disconnect IATS connector.
2. IG "ON" and 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 "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - If the voltage is 0V, go to step 3. If the voltage is more than 5.1V, go to step 2.
Check short to battery in harness
1. IG "OFF" and disconnect IATS connector and ECM connector.
2. Measure resistance between terminals 2 and 4 of IATS harness connector.
3. Measure resistance between terminals 1 and 4 of IATS harness connector.
  Specification: Infinite
4. Is the measured resistance within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair short to battery in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check open in harness
1. IG "OFF" and disconnect IATS connector and ECM connector.
2. Measure resistance between terminal 4 of IATS harness connector and 44 of ECM harness connector (C144-A).
  Specification: below 1Ω
3. Is the measured resistance within specification?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - Repair open in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.