Signal Circuit Inspection

Check for open in signal circuit
1. Measure resistance between terminals 1 of the IAT sensor harness connector and 22 of the ECM harness connector.
  Specification: Approx. 0Ω
2. Is resistance within the specification?
  YES:
  - Go to step 2.
  NO:
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for short to battery in signal circuit.
1. Ignition "ON" & Engine "OFF".
2. With IATS and ECM connector still disconnected, measure voltage between terminals 1 of the IAT sensor harness connector and 22 of the ECM harness connector.
  Specification: Approx. 0V
3. Is voltage within the specification?
  YES:
  - Go to "TERMINAL AND CONNECTOR INSPECTION " procedure.
  NO:
  - Repair open circuit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.