Control Circuit Inspection
- Ignition switch is turned "OFF".
- Disconnect HO2S (upstream) connector.
- Ignition switch is turned "ON".
- Measure voltage between VG terminal of the sensor harness connector and chassis ground.
Specification : Approx. 2~3V
- Measure resistance between VG terminal and other terminals of the HO2S harness connector.
Specification : Infinite ∞Ω
- Is HO2S display near 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.