Control Circuit Inspection

Check short to ground in harness.
1. IG "OFF" and disconnect HO2S (B1/S2) connector.
2. Measure resistance between terminal 2 of HO2S (B1/S2) harness connector and chassis ground.
  Specification: Infinite
3. Is the measured resistance within specification?
  YES
  - Go to HO2S (B1/S2) " 2 Check Open in harness" as follows.
  NO
  - Repair short to ground in HO2S (B1/S2) heater control circuit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check open in harness
1. IG "OFF" and disconnect HO2S (B1/S2) and PCM connector.
2. Measure resistance between terminal 2 of HO2S (B1/S2) harness connector and terminal 74 of PCM harness connector.
  Specification: Approx. below 1Ω
3. Is the measured resistance within specification?
  YES
  - Go to HO2S (B1/S2) "COMPONENT INSPECTION " procedure.
  NO
  - Repair open in HO2S (B1/S2) heater control circuit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.