Control Circuit Inspection

Ignition "OFF".
Disconnect HO2S connector.
Ignition "ON", Engine "OFF".
Measure voltage between VIP terminal of the sensor harness connector and chassis ground.
Specification: Approx. 2~3V

Fig 1: Measuring Voltage Between VIP Terminal Of Sensor Harness Connector & Chassis Ground
Courtesy of HYUNDAI MOTOR CO.
Measure resistance between VIP terminal and other terminals of the HO2S harness connector.
Specification: Infinite

Fig 2: Measuring Resistance Between VIP Terminal Of Sensor Harness Connector Other Terminals
Courtesy of HYUNDAI MOTOR CO.
Is HO2S display near the specification?
YES
- Go to Component Inspection .
NO
- Repair open or short to ground in signal circuit 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.