Ground Circuit Inspection

Ignition "OFF"
Disconnect HO2S connectors
Measure resistance between terminals 1 of the sensor harness connector and chassis ground
Specification : Approx. 0Ω

Fig 1: Measuring Resistance Between Sensor Harness Connector Terminal 1 And Chassis Ground
Courtesy of HYUNDAI MOTOR CO.
Is resistance within the specification?
YES
- Go to "SIGNAL CIRCUIT 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.