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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 57 (Engine Control System Diagnosis (2 Of 2) (HEV)) >> DTC P2096: Post Catalyst Fuel Trim System Too Lean (Bank 1) >> Component Inspection

Component Inspection

WARNING: This page is about a different variant/trim than selected.

■ Exhaust system Inspection 

  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.

■ TWC Inspection 

  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.

■ HO2S Inspection 

  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 PCM)
    • 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 GDS and monitor the "O2 SNSR VOL.-B1/S1" and "O2 SNSR VOL.-B1/S2" parameters on the GDS data list.

    Specification:  Refer to "SIGNAL WAVEFORM & DATA " in the "General Information" procedure

    • Front HO2S (O2 SNSR VOL.-B1/S1): Verify signal is switching from rich(above 0.45V) to lean (below 0.45V) a minimum of 3 times in 10 seconds (voltage will vary between 0.1 and 0.9V) at idle.
    • Rear HO2S (O2 SNSR VOL.-B1/S2): Above 0.6V at idle.
  4. Was a problem found in any of the above areas?

    YES 

    NO 

    • 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.
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