Component Inspection

Warm up the engine to normal operating temperature and check that HO2S signal is active.
Connect Scantool and monitor the "O2 SNSR VOLT.(B1/S2)" parameter on the Scantool data list.
Test Condition : Engine "ON" & In Idle("Closed Loop")condition

Specification : Above 0.6V

Fig 1: Oxygen Sensor Signal Waveform
Courtesy of HYUNDAI MOTOR AMERICA

Fig. 1) Normal value with idle after warm up : Above. 0.6V

Open in signal circuit: Above. 0V
Is sensor data near the specified value?
YES
- Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Check HO2S for contamination, deterioration, or damage. Substitute with a known-good HO2S and check for proper operation. If the problem is corrected, replace HO2S and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.