Power Circuit Inspection
- Ignition "OFF"
- Disconnect HO2S connector.
- Ignition "ON" & Engine "OFF"
- Measure voltage between terminal 3 of the HO2S heater harness connector and chassis ground.
Specification: B+
- Is voltage within the 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 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.