Power Circuit Inspection

■ Check voltage 

1. IG "OFF". Disconnect HO2S connector.
2. IG "ON".
3. Measure voltage between Heater Power terminal of the HO2S harness connector and chassis ground.

   Specification:  B+

4. Is voltage display near the specified value?

   YES 

   • Go to "Control Circuit Inspection " procedure.

   NO 

   • Check for open or short in the power supply circuit between the main relay and the HO2S. Especially check for "15A Sensor 2 fuse" is installed and not blown. Repair 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.