Control 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 control terminal of HO2S (downstream) heater harness connector and chassis ground.
Specification: Approx. 2~3V
Is voltage within specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
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.