Signal Circuit Inspection

Check reference voltage in harness
1. Ignition "OFF"
2. Disconnect IAT sensor connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 5 of IAT sensor harness connector and chassis ground.
  Specification: Approx. 5V
5. Is the measured voltage within specifications?
  YES:
  - Go to "COMPONENT INSPECTION " procedure.
  NO:
  - Go to step 2 "Check for short to ground in harness"as below.
Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect IAT sensor connector.
3. Measure resistance between terminal 5 of IAT sensor harness connector and chassis ground.
  Specification: infinite
4. Is the measured resistance within specifications?
  YES:
  - Go to "COMPONENT INSPECTION " procedure.
  NO:
  - Check for short to ground in signal harness.
  - Repair or replace as necessary. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.