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Home >> Hyundai >> 2008 >> Azera GLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) >> DTC Troubleshooting Procedures >> DTC P2098 Post Catalyst Fuel Trim System Too Lean (Bank 2) >> Component Inspection

Component Inspection

  1. Check Exhaust system
    1. Visually/physically inspect the following conditions:
      • Exhaust system between HO2S and Three way catalyst for air leakage, restriction and damage.
      • Damage, and for loose or missing hardware
    2. Was a problem found in any of the above areas?

      YES 

      NO 

      • Go to next step as below
  2. Check TWC
    1. Visually/physically inspect the three-way catalyst (TWC) converter for the following damage:
      • Severe discoloration caused by excessive temperature
      • Dents and holes
      • Internal rattle caused by a damaged catalyst
    2. Also, ensure that the TWC is a proper original equipment manufacturer part.
    3. Was a problem found?

      YES 

      NO 

      • Go to next step as below
  3. Check HO2S
    1. Visually/physically inspect the HO2S for the following conditions:
      • Ensure that the HO2S is securely installed. (Pigtail and wiring harness not making contact with the exhaust pipe)
      • Check for corrosion on terminals and terminal tension (at the HO2S and at the ECM)
      • Front HO2S for silicon contamination. This contamination will be indicated by a white powdery coating on the portion of the sensor exposed to the exhaust stream and this will result in a but false (high) voltage signal
      • Fuel, engine coolant or oil contamination
      • Use of improper sealant
      • If contamination is evident on the HO2S, Fix the source of the sensor contamination before replacing the sensor to prevent future contamination. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    2. Warm up the engine to normal operating temperature and let it idle.
    3. Connect Scantool and monitor the "O2 SNSR VOL.-B2/S1" and "O2 SNSR VOL-B2/S2" parameters on the Scantool data list.

      Specification:

      • Front HO2S (O2 SNSR VOL.-B2/S1): Approx. 0-1V with idle after warm up Sensor voltage increase during engine acceleration and decrease during engine deceleration

        Approx. 0V ~ 0.4 V when fuel cut

      • Rear HO2S (O2 SNSR VOL.-B2/S2): Above 0.4V at idle
    4. Was a problem found in any of the above areas?

      YES 

      NO 

      • Check for poor connection between ECM 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
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