Power Circuit Inspection

WARNING: This page is about a different variant/trim than selected.

Turn "OFF" the ignition switch.
Disconnect HO2S connector.
Turn "ON" the ignition switch.
Measure voltage between power terminal of HO2S (downstream) heater harness connector and chassis ground.
Specification: Battery voltage
Is voltage within specification?
YES
- Go to "CONTROL CIRCUIT INSPECTION " procedure.
NO
- Check for an open in the power supply circuit between the main relay and the HO2S. Especially check for "SENSOR2 FUSE 15A" is properly installed and not blown. 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.