Signal Circuit Inspection

■ Check voltage 

1. IG "OFF" and disconnect HO2S (S2)_DOWN connector.
2. IG "ON"
3. Measure voltage between signal terminal "1" of HO2S (S2)_DOWN harness connector and chassis ground.

   Specification:  Approx. 0.45V

4. Is the measured voltage within specification?

   YES 

   • Go to "Ground circuit inspection " procedure.

   NO 

   • Repair open in harness, and go to "Verification of Vehicle Repair " prcedure.