Signal Circuit Inspection

Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect IG failure sensor connector.
3. Measure resistance between terminal "2" of IG failure sensor harness connector and chassis ground.
  Specification: Infinite
4. Is the measured resistance within specifications?
  YES:
  - Go to step 2 "Check for short to battery in harness" as below.
  NO:
  - Check short to ground in signal harness.
  - Repair or replace as necessary and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for short to battery in harness
1. Ignition "OFF"
2. Disconnect IG failure sensor connector.
3. Measure resistance between terminals "2" and "4" of IG failure sensor harness connector.
4. Measure resistance between terminals "2" and "3" of IG failure sensor harness connector.
  Specification: Infinite
5. Is the measured resistance within specifications?
  YES:
  - Go to step 3 "Check for open in harness" as below.
  NO:
  - Check short to battery in signal harness.
  - Repair or replace as necessary and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for open in harness
1. Ignition "OFF"
2. Disconnect IG failure sensor and PCM connector.
3. Measure resistance between terminal "2" of IG failure sensor harness connector and terminal "3/121 -B" of PCM harness connector.
  Specification: Approx. below 1Ω
4. Is the measured resistance within specifications?
  YES:
  - Go to COMPONENT INSPECTION .
  NO:
  - Check open in harness between IG failure sensor connector and PCM connector.
  - Repair or replace as necessary and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.