Control Circuit Inspection
- Measure voltage between terminal 4 of the HO2S heater harness connector and chassis ground.
Specification: Approx. 4-5V
- 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.