Control Circuit Inspection

Ignition "OFF"
Disconnect HO2S sensor connector
Ignition "ON" & Engine "OFF"
Measure voltage between terminal 6 of the HO2S heater harness connector and chassis ground
Specification: Approx. 4~5V
Is voltage within the specification?
YES
- Go to TERMINAL AND CONNECTOR INSPECTION .
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.