GDS data analysis

Connect GDS and select "DTC Analysis" mode
Start the engine.
Monitor the parameters related to DTC on the "Current Data" menu of the GDS (Fig 1).

Fig 1: Screen Display - Right After Engine Cold Start (Water Temperature 39°C)
Courtesy of HYUNDAI MOTOR AMERICA

Off duration O2 sensor heating upstream value is growing up to 30.9% at a time of start and then it will decreases approx. 25~35%.

Lambda closed loop active is turned on after 25 s from engine start.

Fig 2: Screen Display - Engine Warmed Up State
Courtesy of HYUNDAI MOTOR AMERICA
Is parameter displayed within specifications?
YES
- Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Go to next step.