Signal Circuit Inspection

Ignition "ON" & Engine "OFF"
Measure voltage between signal terminal of HO2S (B1S1) harness connector and chassis ground
Specification : Approx. 0.4~0.5V
Is voltage within the specification?
YES
- Go to next step as below.
NO
- Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NOTE: HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire (s). Do not attempt to repair the wire (s), connector, or the terminals.