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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 74 (Engine Control System & Fuel System - 3.6L - DTC P0192 To DTC P0629/P062B) >> DTC P0420 or P0430 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Saturn Outlook, 2010 GMC Acadia, 2010 Chevrolet Traverse, and 2010 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Observe the DTC information with a scan tool. Verify there are no HO2S, fuel system, or misfire DTCs set.
  2. 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
    • Restrictions
    • If a condition is found, repair as necessary.
  3. Verify the following conditions do not exist with the exhaust system:
    • Leaks
    • Physical damage
    • Loose or missing hardware
    • Improperly torqued HO2S
    • If a condition is found, repair the exhaust system.
  4. 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.
  5. If no physical condition is detected and the HO2S 2 is as active as the HO2S 1 after operating the engine at 1, 500 RPM for 1 minute and then returning to a stabilized idle, then replace the appropriate catalytic converter.
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