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Home › Pontiac › 2009 › Vibe Base, 1.8 8, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Control System & Fuel System - 1.8L (Lay) - DTC P0010 To DTC P0420 › DTC P0420 › Circuit/System Testing

Circuit/System Testing

  1. Verify the following conditions do not exist with the catalytic converter:
    • Dents
    • A severe discoloration caused by excessive temperatures
    • Road damage
    • An internal rattle caused by damaged catalyst substrate
    • Exhaust flow restrictions - Refer to Restricted Exhaust .
    • If a condition is found, replace the catalytic converter.
  2. Verify the following conditions do not exist with the exhaust system:
    • Leaks - Refer to Exhaust Leakage .
    • Physical damage
    • Loose or missing hardware
    • Properly torqued HO2S
    • If a condition is found, repair the exhaust system.
  3. Verify the following conditions do not exist with the HO2S 2:
    • A grounded wiring harness
    • Damage
    • If a condition is found, replace the HO2S 2.
  4. Engine running at normal operating temperatures, increase the engine speed to 2,500-3,000 RPM for 3 minutes. Engine at idle, observe the scan tool HO2S 2 parameter for 1 minute. The HO2S 2 voltage should not be actively switching above and below 450 mV.
    • If the voltage is actively switching, replace the TWC converter.
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